&EPA
United States
Environmental Protection
Agency

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Table of Contents
Chapter
Page No.
           1,  A Consumer's Guide To The Nation's Drinking Water	•.  1

           2.  How Safe Is My Drinking Water?	2

           3.  Where Does My Drinking Water Come From And How Is It Treated?	  7

           4.  How Do We Use Drinking Water In Our Homes?	  10

           5.  What's Being Done To Improve Water Security?	  13

           6.  What Can I Do If There Is A Problem With My Drinking Water?	  15

           7,  How Safe Is The Drinking Water In My Household Well?	  18

           8.  What You Can Do To Protect Your Drinking Water	21

  Appendix A:  National Primary Drinking Water Standards as of 10/03	23

  Appendix B:  References	.28

  Appendix C:  Sources of Additional Information	29

  Appendix D:  Glossary	  31
Office of Water (4601)
EPA816-K-03-007
www.epa.gov/safewater
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 1.   A  Consumer's Guide To  The
       Nation's  Drinking  Water
The United States enjoys one of the best supplies of
drinking water in the world. Nevertheless, many of
us who once gave little or no thought to the water
that comes from our taps are now asking the ques-
tion: "Is my water safe to drink?" While tap water
that meets federal and state standards is generally
safe to drink, threats to drinking water are increasing.
Short-term disease outbreaks and water restrictions
during droughts have demonstrated that we can no
longer take  our drinking water for granted.
Consumers have many questions about their drinking
water. How safe is my drinking water? What is being
done to improve security of public water systems?
Where does my drinking water come from, and how
is it treated? Do private wells receive the same pro-
tection as public water systems? What can I do to
help protect my drinking water?
www.epa.gov/safewater
This booklet provides the answers to these and other
frequently asked questions.

This booklet also directs you to more detailed sources
of information. Often, you will be directed to a page
on the EPA website. Additionally, the Safe Drinking
Water Hotline is available to answer your questions.
Please also see Appendix C for more resources. Refer
to the Glossary (Appendix D) for definitions of words
in bold font.
                                            What you  need
                                            to know to protect
                                           your family
  Sensitive Subpopulations

  Some people may be more vulnerable to con-
  taminants in drinking water than the general
  population. People undergoing chemotherapy
  or living with HIV/AIDS, transplant patients,
  children and infants, the frail elderly, and preg-
  nant women and their fetuses can be particu-
  larly at risk for infections.

  If you have special health care needs, con-
  sider taking additional precautions with your
  drinking water, and seek advice from your
  health care provider. For more information,
  see www.epa.gov/safewater/healthcare/
  special.html.

  You will find information on bottled water
  and home water treatment units on page 16
  of this booklet. You may also contact NSF
  International, Underwriter's Laboratory, or the
  Water Quality Association. Contact information
  is located in Appendix C.
 Safe Drinking Water (SOW) Hotline: 800-426-4791
                                                                                              3

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2.   How  Safe  Is  My Drinking  Water?
What Law Keeps My Drinking
Water Safe?

Congress passed the Safe Drinking Water Act
(SDWA) in 1974 to protect public health by regulat-
ing the nation's public drinking water supply and
protecting sources of drinking water. SDWA is
administered by the U.S. Environmental Protection
Agency (EPA) and its state partners.
   Highlights of the Safe Drinking
   Water Act

   •  Authorizes EPA to set enforceable health stan-
     dards for contaminants in drinking water

   •  Requires public notification of water systems
     violations and annual reports (Consumer
     Confidence Reports) to customers on con-
     taminants found in their drinking water -
     www.epa.gov/safewater/ccr

   •  Establishes a federal-state partnership for regu-
     lation enforcem$nt  .

   •  Includes provisions specifically.designed to
     protect underground sources of drinking water
     - www.epa.gay/Safewater/uic

   •  Requires disinfection of surface water supplies,
     except those with pristine, protected sources

   *  Establishes a multi-billion-dollarstate'-revolv-
     ing loan fund for water system upgrades -
     www.epa.gov/saf0water/dwsrf

   •  Requires an assessment of the vulnerability of
     all drinking water sources to contamination -
     www.epa.goy/safewater/protect

   — Drinking Water; Past, Present, and.Future
     EPA-816'F'00-Q02
What Is A Public Water System?

The Safe Drinking Water Act (SDWA) defines a
public water system (PWS) as one that serves piped
water to at least 25 persons or 15 service connections
for at least 60 days each year. There are approxi-
mately 161,000 public water systems in the United
States.1 Such systems may be publicly or privately
owned. Community water systems (CWSs) are
public water systems that serve people year-round in
their homes. Most people in the U.S. (268 million)
get their water from a community water system. EPA
also regulates other kinds of public water systems,
  Public Water Systems

  Community Water System (54,000 systems)^
  A public water system that serves the same
  people year-round. Most residences are
  served by Community Water Systems.

  Non-Community Water System
  (approximately 108,000 systems)—A public
  water system that does not serve the same
  people year-round. There are two types of
  non-community systems:
  • Non-Transient Non-Community Water
    System (a/most 19,000 systems)—A non-
    community water system that serves the
    same people more than six months of the
    year, but not year-round.  For example, a
    school with its own water supply is consid-
    ered a non-transient system.
  • Transient Non-Community Water System
    (more than  89,000 systems)—A non-
    community water system that serves the
    public but not the same individuals for
    more than six months. For example, a rest
    area or a campground may be considered a
    transient  system.
www.epa.gov/safewater
                    SOW Hotline: 800-426-4791

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such as those at schools, campgrounds, factories, and
restaurants. Private water supplies, such as household
wells that serve one or a few homes, are not regulated
by EPA. For information on household wells, see
"How Safe Is The Drinking Water In My Household
Well?" on page 18 of this booklet.
   Cost of Making Water Safe
   Continues to Rise

   Much of the existing water infrastructure
   (underground pipes, treatment plants, and
   other facilities) was built many years ago. In
   1999, EPA conducted the second Drinking
   Water Infrastructure Needs Survey, and found
   that drinking water systems will need to invest
   $150 billion over a 20-year period to ensure
   clean and safe drinking water.
Will Water Systems Have Adequate
Funding  In The Future?

Nationwide,  drinking water systems have spent hun-
dreds of billions of dollars to build drinking water
treatment and distribution systems. From 1995 to
2000, more than $50 billion was spent on capital
investments to fund water quality improvements.2

With the aging of the nation's infrastructure, the clean
water and drinking water industries face a signifi-
cant challenge to sustain and advance their achieve-
ments in protecting public health. EPA's Clean Water
& Drinking Water Infrastructure Gap Analysis^
has found that if present levels of spending do not
increase, there will be a significant funding gap by
the year 2019.


Where Can I Find Information About
My Local Water System?

Since 1999, water suppliers have been required to
provide annual Consumer Confidence Reports to
their customers. These reports are due by July 1 each
year, and contain information on contaminants found

www.epa.gov/safewater
in the drinking water, possible health effects, and the
water's source. Some Consumer Confidence Reports
are available at www.epa.gov/safewater/dwinfo.htm.

Water suppliers must promptly inform you if your
water has become contaminated by something that
can cause immediate illness. Water suppliers have
24 hours to inform their customers of violations of
EPA standards "that have the potential to have seri-
ous adverse effects on human health as a result of
short-term exposure." If such a violation occurs, the
water system will announce it through the media, and
must provide information about the potential adverse
effects on human health, steps the system is taking to
correct the violation, and the need to use alternative
water supplies (such as boiled or bottled water) until
the problem is corrected.

Systems will inform customers about violations of
less immediate concern in the first water bill sent
after the violation, in a Consumer Confidence Report,
or by mail within a year.  In  1998, states began com-
piling information on individual systems, so you can
evaluate the overall quality of drinking water in your
state. Additionally, EPA must compile and summarize
the state reports into an annual report on the condi-
tion of the nation's drinking water. To view the most
recent annual report, see www.epa.gov/safewater/annual.


How Often Is My Water Supply
Tested?

EPA has established pollutant-specific minimum test-
ing schedules for public water systems. To find out
how frequently your drinking water is tested, contact
your water system or the agency in your state in
charge  of drinking water.

If a problem is detected, immediate retesting require-
ments go into effect along with strict instructions
about how the system informs the public. Until the
system can reliably demonstrate that it is free of
problems, the retesting is continued.

In 2001, one out of every four community water
systems did not conduct testing or report the results
for all of the monitoring required to verify the safety

                      SOW Hotline:  800-426-4791

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of their drinking water.4 Although
failure to monitor does not necessar-
ily suggest safety problems, conduct-
ing the required reporting is crucial to
ensure that problems will be detected.
Consumers can help make sure certain
monitoring and reporting requirements
are met by first contacting their state
drinking water agency to determine if
their water supplier is in compliance.
If the water system is not meeting the
requirements, consumers can work with
local and state officials and the water
supplier to make sure the required mon-
itoring and reporting occurs.

A network of government agencies
monitor tap water suppliers and enforce
drinking water standards to ensure the
safety of public water supplies. These
agencies include EPA, state depart-
ments of health and environment,
and local public health departments.
 Reported Community Water Systems Violating
  Maximum Contaminant Levels or Treatment
               Standards in FY 2002
                                                   D
                                                   District of
                                                   Columbia
D 0% - 6% of Systems
-11% of Systems   • 11+% of Systems
  Common Sources of Pollution

  Naturally Occurring:  microorganisms (wild-
  life and soils), radionuclides (underlying rock),
  nitrates and nitrites (nitrogen compounds in
  the soil), heavy metals (underground rocks
  containing arsenic, cadmium, chromium, lead,
  and selenium), fluoride.
  Human Activities: bacteria and nitrates
  (human and animal wastes—septic tanks and
  large farms), heavy metals  (mining construc-
  tion, older fruit orchards), fertilizers and pes-
  ticides (used by you and others (anywhere
  crops or lawns are maintained)), industrial
  products and wastes (local  factories, indus-
  trial plants, gas stations, dry cleaners, leak-
  ing underground storage tanks, landfills, and
  waste dumps), household wastes  (cleaning
  solvents, used motor oil, paint, paint thinner),
  lead and copper (household plumbing materi-
  als), water treatment chemicals (wastewater
  treatment plants).
www.epa.gov/safewater
          Nevertheless, problems with local drinking water can,
          and do, occur.
          What Problems Can Occur?

          Actual events of drinking water contamination are
          rare, and typically do not occur at levels likely to
          pose health concerns. However, as development in
          our modern society increases, there are growing
          numbers of activities that can contaminate our drink-
          ing water. Improperly disposed-of chemicals, animal
          and human wastes, wastes injected underground, and
          naturally occurring substances have the potential to
          contaminate drinking water. Likewise, drinking water
          that is not properly treated or disinfected, or that
          travels through an improperly maintained distribution
          system, may also pose a health risk. Greater vigilance
          by you, your water supplier, and your government
          can help prevent such events in your water supply.

          Contaminants can enter water supplies either as a
          result of human and animal activities, or because they
          occur naturally in the environment. Threats to your
          drinking water may exist in your neighborhood, or
          may occur many miles away. For more information
          on drinking water threats, see www.epa.gov/safewater/

                                 SOW Hotline: 800-426-4791

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publicoutreach/landscapeposter.html. Some typical
examples are microbial contamination, chemical con-
tamination from fertilizers, and lead contamination.
                Boil Water Notices
                for Microbial
                Contaminants
                When microorganisms such
   as those that indicate fecal contamination are
   found in drinking water, water suppliers are
   required to issue "Boil Water Notices." Boiling
   water for one minute kills the microorgan-
   isms that cause disease. Therefore, these
   notices serve as a precaution to the public.
   www.epa.gov/safewater/faq/emerg.html
Microbial Contamination:

The potential for health problems from microbial-
contaminated drinking water is demonstrated by
localized outbreaks of waterborne disease. Many of
these outbreaks have been linked to contamination by
bacteria or viruses, probably from human or animal
wastes. For example, in 1999 and 2000, there were 39
reported disease outbreaks associated with drinking
water, some of which were linked to public drinking
water supplies.5

Certain pathogens (disease-causing microorgan-
isms), such as Cryptosporidium, may occasionally
pass through water filtration and disinfection process-
es in numbers high enough to cause health problems.,
particularly in vulnerable members of the population.
Cryptosporidium causes the gastrointestinal disease,
cryptosporidiosis, and can cause serious, some-
times fatal, symptoms, especially among sensitive
members of the population. (See box on Sensitive
Subpopulations on page 1.) A serious outbreak of
crypto sporidiosis occurred in 1993 in Milwaukee,
Wisconsin, causing more than 400,000 persons to
be infected with the disease, and resulting in at least
50 deaths. This was the largest recorded outbreak of
waterborne disease in United States history.6
www.epa.gov/safewater
    Excessive levels of nitrates

                can cause

       "blue baby syndrome,"

          which can  be fatal

                  without

                immediate

          medical attention.


Chemical Contamination From Fertilizers:

Nitrate, a chemical most commonly used as a fertil-
izer, poses an immediate threat to infants when it is
found in drinking water at levels above the national
standard. Nitrates are converted to nitrites in the
intestines. Once absorbed into the bloodstream,
nitrites prevent hemoglobin from transporting oxy-
gen. (Older children have an enzyme that restores
hemoglobin.) Excessive levels can cause "blue baby
syndrome," which can be fatal without immediate
medical attention. Infants most at risk for blue baby
syndrome are those who are already sick, and while
they are sick, consume food that is high in nitrates
or drink water or formula mixed with water that is
high in nitrates. Avoid using water with high nitrate
levels for drinking. This is especially important for
infants and young children, nursing mothers, pregnant
women and certain elderly people.
                  Nitrates:
                  Do NOT Boil

                  Do NOT boil water to
                  attempt to reduce nitrates.
  Boiling water contaminated with nitrates
  increases its concentration and potential risk.
  if you are concerned about nitrates, talk to
  your health care provider about alternatives to
  boiling water for baby formula.
                     SDW Hotline: 800-426-4791

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Lead Contamination:

Lead, a metal found in natural deposits, is commonly
used in household plumbing materials and water ser-
vice lines. The greatest exposure to lead is swallow-
ing or breathing in lead paint chips and dust. But lead
in drinking water can also cause a variety of adverse
health effects. In babies and
children, exposure to lead
in drinking water above the
maximum contaminant
level can result in delays in
physical and mental devel-
opment, along with slight
deficits in attention span and
learning abilities. In adults,
it can cause increases in
blood pressure. Adults who
drink this water over many
years could develop kidney
problems or high blood pres-
sure. Lead  is rarely found
in source water, but enters
tap water through corrosion
of plumbing materials. Very
old and poorly maintained
homes may be more likely
to have lead pipes, joints,
and solder. However, new
homes are also at risk: even legally "lead-free" pipes
may contain up to 8 percent lead. These pipes can
leave significant  amounts of lead in the water for the
first several months after their installation. For more
information on lead contamination, see www.epa.gov/
safewater/contaminants/dw_contamfs/lead.html.
                  Lead:  Do NOT Boil

                  Do NOT boil water to attempt
                  to reduce lead, Boilirfg water
                  increases lead concentration.
   Always use water from the cold tap for pre-
   paring baby formula, cooking, and drinking.
   Flush pipes first by running the water before
   using it. Allow the water to run until it's cold.
   If you have high lead levels in your tap water,
   talk to your health care provider about alter-
   natives to using boiled water in baby formula.
For more information on drinking water contaminants
that are regulated by EPA, see Appendix A, or visit
www.epa.gov/safewatef/mcl.html.


Where Can I  Find More Information
About My  Drinking  Water?

                 Drinking water varies from
                 place to place, depending on the
                 water's source and the treatment
                 it receives. If your drinking water
                 comes from a community water
                 system, the system will deliver
                 to its customers annual drinking
                 water quality reports (or Consumer
                 Confidence Reports). These
                 reports will tell consumers what
                 contaminants have been detected
                 in their drinking water, how these
                 detection levels compare to drink-
                 ing water standards, and where
                 their water comes from. The
                 reports must be provided annually
                 before July 1, and, in most cases,
                 are mailed directly to customers'
                 homes. Contact your water suppli-
                 er to get a copy of your report, or
                 see if your report is posted online
at www.epa.gov/safewater/dwinfo.htm. Your state's
department of health or environment
can also be a valuable source of information. For
help in locating these agencies, call the Safe Drinking
Water Hotline. Further resources can be found in
Appendix C. Information on testing household wells
is on page 19.
www.epa.gov/safewater
1  Factoids: Drinking Water & Ground Water Statistics for
  2002, 2003.
2  Community Water Systems Survey 2000, Volume I, 2001.
3  The Clean Water and Drinking Water Infrastructure Gap
  Analysis, EPA 816-R-02-020.
4  Factoids: Drinking Water and Ground Water Statistics for
  2001, EPA8I6-K-02-004.
5  Morbidity and Mortality Weekly Report: Surveillance for
  Waterhorne Disease Outbreaks, United States 1999-2000,
  2002.
6  25 Years of the Safe Drinking Water Act, 1999.
                       SOW Hotline: 800-426-4791

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3.   Where  Does  My  Drinking  Water
       Come  From And  How  Is  It Treated?
Your drinking water comes from surface water or
ground water. The water that systems pump and
treat from sources open to the atmosphere, such
as rivers, lakes, and reservoirs is known as surface
water. Water pumped from wells drilled into under-
ground aquifers, geologic formations containing
water, is called ground water. The quantity of water
produced by a well depends on the nature of the rock,
sand, or soil in the aquifer from which the water is
drawn. Drinking water wells may be shallow (50 feet
or less) or deep (more than 1,000 feet). More water
systems have ground water than surface water as a
source (approx. 147,000 v. 14,500), but more people
drink from a surface water system (195 million v.
101,400). Large-scale water supply systems tend to
rely on surface water resources, while smaller water
systems tend to use ground water. Your water utility
or public works department can tell you the source of
your public water supply.


How Does Water Get To
My Faucet?

An underground network of pipes typically delivers
drinking water to the homes and businesses served by
the water system. Small systems serving just a hand-
ful of households may be relatively simple, while
large metropolitan systems can be extremely com-
plex—sometimes consisting of thousands of miles of
pipes serving millions of people. Drinking water must
meet required health standards when it leaves the
treatment plant. After treated water leaves the plant, it
is monitored within the distribution system to identify
and remedy any problems such as water main breaks,
pressure variations, or growth of microorganisms.
How Is  My Water Treated
To Make It Safe?

Water utilities treat nearly 34 billion gallons of water
every day.1 The amount and type of treatment applied
varies with the source and quality of the water.
Generally, surface water systems require more treat-
ment than ground water systems because they are
directly exposed to the atmosphere and runoff from
rain and melting snow.

Water suppliers use a variety of treatment processes
to remove contaminants from drinking water. These
individual processes can be arranged in a "treatment
train" (a series of processes applied in a sequence).
The most commonly used processes include coagu-
lation (flocculation and sedimentation), filtration,
and disinfection.  Some water systems also use ion
exchange and adsorption. Water utilities select the
treatment combination most appropriate to treat the
contaminants found in the source water of that par-
ticular system.

Coagulation (Flocculation & Sedimentation):
Flocculation: This step removes dirt and other par-
ticles suspended in the water. Alum and iron salts or
synthetic organic polymers are added to the water to
form tiny sticky particles called "floe," which attract
the dirt particles.
  All sources of drinking water contain some
  naturally occurring contaminants. At low levels,
  these contaminants generally are not harmful in
  our drinking water. Removing all contaminants
  would be extremely expensive, and in most
  cases, would not provide increased protection
  of public health. A few naturally occurring min-
  erals may actually improve the taste of drinking
  water and may even have nutritional value at
  low levels.
www.epa.gov/safewater
                                                                     SOW Hotline: 800-426-4791

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Sedimentation: The flocculated particles then settle
naturally out of the water.


Filtration:

Many water treatment facilities use filtration to
remove all particles from the water. Those particles
include clays and silts, natural organic matter, precip-
itates from other treatment processes in the facility,
iron and manganese, and microorganisms. Filtration
clarifies the  water and enhances the effectiveness of
disinfection.
   Water Treatment  Plant

   Follow a drop of water from the source through the treatment process. Water may be treated differently
   in different communities depending on the quality of the water which enters the plant. Groundwater is
   located underground and typically requires less treatment than water from lakes, rivers, and streams.
                           Coagulation removes dirt and other particles suspended in
                           water. Alum and other chemicals are added to water to form
                           tiny sticky particles called "floe" which attract the dirt
                           particles. The combined weight of the dirt and the alum
                           (Hoc) become heavy enough to sink to the bottom during
                           sedimentation.
            Sedimentation:
            The heavy particles
            (floe) settle to the
            bottom and the
            clear water moves
            to filtration.
                                 Disinfection: A small amount of chlorine is added or
                                 some other disinfection method is used to kill any
                                 bacteria or microorganisms that may be in the water.
                      Storage: Water is placed in
                      a closed tank or reservoir
                      for disinfection to take
                      place. The water then flows
                      through pipes to homes
                      and businesses in the
                      community.
             Filtration: The water passes
             through filters, some made
             of layers of sand, gravel, and
             charcoal that help remove
             even smaller particles.
       Source: AWWA Drinking Water Week Blue Thumb Kit
www.epa.gov/safewater
                          SOW Hotline: 800-426-4791

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Disinfection:

Disinfection of drinking water is considered to be
one of the major public health advances of the 20th
century. Water is often disinfected before it enters the
distribution system to ensure that dangerous micro-
bial contaminants are killed. Chlorine, chlorinates, or
chlorine dioxides are most often used because they
are very effective disinfectants, and residual concen-
trations can be maintained in the water system.
                       Water System Filtration Tank
Why Is My Water Bill  Rising?

The cost of drinking water is rising as suppliers meet
the needs of aging infrastructure, comply with pub-
lic health standards, and expand service areas. In
most cases, these increasing costs have caused water
suppliers to raise their rates. However, despite rate
increases, water is generally still a bargain compared
to other utilities, such as electricity and phone ser-
vice. In fact, in the United States, combined water
and sewer bills average only about 0.5 percent of
household income.2
1  Protect Your Drinking Water, 2002.
2  Congressional Budget Office Study: Future Investment in
  Drinking Water & Wastewater Infrastructure, 2002.
Disinfection Byproducts

Disinfection of drinking water is one of the
major public health advances of the 20th
century. However, sometimes the disinfec-
tants themselves can react with naturally
occurring materials in the water to form
unintended byproducts, which  may pose
health risks. EPA recognizes the importance
of removing microbial contaminants while
simultaneously protecting the public from
disinfection byproducts, and  has developed
regulations to limit the presence of these
byproducts. For more information, see
www.epa.gov/safewater/mdbp.html.
                                                               Water passes through charcoal, sand, and
                                                         gravel layers in a water system's filtration tank.
www.epa.gov/safewater
                    SOW Hotline: 800-426-4791

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4.   How  Do  We  Use  Drinking
       Water  In  Our  Homes?
We take our water supplies for granted, yet they are
limited. Only one percent of all the world's water
can be used for drinking. Nearly 97 percent of the
world's water is salty or otherwise undrinkable, and
the other two percent is locked away in ice caps
and glaciers. There is no "new" water: whether our
source water is a stream, river, lake, spring, or well,
we are using the same water the dinosaurs used mil-
lions of years ago.
                         How Much Water Do Homes In
                         The U.S. Use Compared To Other
                         Countries?

                         Americans use much more water each day than indi-
                         viduals in both developed and undeveloped countries:
                         For example, the average European uses 53 gallons;
                         the average Sub-Saharan citizen, 3-5 gallons.4
       Common Household Uses of Drinking Water*
                  (*Gal/ons per Capita per Day)
                 Bathing, 20 gpcd
             Toilet Flushing, 24 gpcd
                                      Drinking and Cooking, 2 gpcd
                                       Garbage Disposal, 1 gpcd
                                         Dishwasher, 4 gpcd
                                                      Car
                                                    Washing
                                                    2.5 gpcd
      Lawn Watering and
          Pools, 25 gpcd
Source: Van Dar Leaden, F., F. L. Troise, and D. K. Todd,
Ilia Water EncydQBedja., Lewis Publishers, Inc. Second Edition, 1990.
The average American uses about 90 gallons of water
each day in the home, and each American household
uses approximately 107,000 gallons of water each
year.1 For the most part, we use water treated to meet
drinking water standards to flush toilets, water lawns,
and wash dishes, clothes, and cars. In fact, 50-70
percent of home water is used for watering lawns
and gardens.2 Nearly 14 percent of the water a typi-
cal homeowner pays for is never even used—it leaks
down the drain.3
www.epa.gov/safewater
               Water efficiency plays an impor-
               tant role in protecting water sourc-
               es and improving water quality. By
               using water wisely, we can save
               money and help the environment.
               Water efficiency means using less
               water to provide the same benefit.
               Using water-saving techniques
               could save you hundreds of dollars
               each year, while also reducing the
               amount of pollutants entering our
               waterways.


               How Do Drinking
               Water Utilities
               Conserve Water?

               Water utilities forecast water
               source availability, growth in
               population, and water demand to
ensure adequate future water supplies during normal
conditions, as well as periods of drought. When water
shortages are predicted or experienced, water utilities
have many options for conserving water. Temporary
cutbacks or permanent operating adjustments can
help conserve water.

Temporary cutbacks may include:
• Reduction of system-wide operating pressure, and
• Water use bans, restrictions, and rationing.
                                              SOW Hotline: 800-426-4791

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Permanent conservation measures may include:
•  Subsidizing use of water-efficient faucets, toilets,
   and showerheads,
•  Public education and voluntary use reduction,
•  Billing practices that impose higher rates for high-
   er amounts of water use,
»  Building codes that require water-efficient fixtures
   and appliances,
•  Leak detection surveys and meter testing, repair,
   and replacement, and
•  Reduction in use and increase in recycling of
   industrial water.


How Can Businesses Conserve
Water?

The industrial and commercial sectors can con-
serve water through recycling and waste reduction.
Industry has implemented conservation measures to
comply with state and federal water pollution con-
trols. Evaluation of industrial plant data may show
that a particular process or manufacturing step uses
the most water or causes the greatest contamination.
Such areas can be targeted for water conservation.
Also, water that is contaminated by one process may
be usable in other plant processes that do not require
high-quality water.
How Can  i Conserve Water?

The national average cost of water is $2.00 per
1,000 gallons.  The average American family spends
about $474 each year on water and sewage charges.5
American households spend an additional $230 per
year on water heating costs.6 By replacing appliances
such as the dishwasher and inefficient fixtures such
as toilets and showerheads, you can save a substantial
amount each year in water, sewage, and energy costs.

There are many ways to save water in and around
your home. Here are  the five that might get the best
results:
                                 Ways To Save Water At Home*
                          (*Water Savings as Percent of Total Interior Water Use)
            Low-Flow Showerheads
         (or Flow Restrictors), 12 percent
           Low-Water Use
       Clothes Washers, 5 percent
  Source: Corbitt, Robert A.
  Standard Handbook of Environmental Engineering
  McGraw-Hill, Inc. 1989.
                  Low-Water Use Toilets
              (or Plastic Bottles or Water Dams
               in Toilet Reservoir), 18 percent
                       Low-Flow Aerators on
                      Faucets (or Replacement
                        Faucets}, 2 percent

                         Low-Water Use
                       Dishwasher, 4 percent
                                                                     Insulation on
                                                                   Hot Water Lines,
                                                                      4 percent
www.epa.gov/safewater
                                                                             SDW Hotline: 800-426-4791

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   Stop Leaks.
   Replace Old Toilets with models that use 1.6
   gallons or less per flush.
   Replace Old Clothes Washers with EPA Energy
   Star certified models.
   Plant the Right Kind of Garden that requires less
   water.
   Provide Only the Water Plants Need.
For more information on ways to conserve water in
the home, see www.epa.gov/water/waterefficiency.html or
www.h2ouse.org.
  Water Trivia Facts, EPA 80-F-95-001.
  AWWA Stats on Tap.
  Using Water Wisely in the Home, 2002.
  The Use of Water Today, World Water Council.
  Investing in America's Water Infrastructure, 2002.
  Using Water Wisely in the Home, 2002.
                                           Nearly 14 percent
                                           of the  water
                                           a typical homeowner
                                           pays for
                                           is never even used—
                                           it leaks down
                                           the drain.
                                                     Using Water Wisely in the Home, 2002
www.apa.gov/safewater
                  SOW Hotline: 800-426-4791

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5.   What's  Being  Done  To  Improve
       Water  Security?
What Security Measures Are In
Place To Protect Water Systems?

Drinking water utilities today find themselves fac-
ing new responsibilities due to concerns over water
system security and counter-terrorism. EPA is com-
mitted to the safety of public drinking water supplies
and has taken numerous steps to work with utilities,
other government agencies, and law enforcement to
minimize threats.

The Public Health Security and Bioterrorism
Preparedness and Response Act of 2002 requires that
all community water systems serving more than 3,300
people evaluate their susceptibility to potential threats
and identify corrective actions. EPA has provided
assistance to help utilities with these Vulnerability
Assessments by giving direct grants to large  systems,
supporting self-assessment tools, and providing tech-
nical help and training to small and medium utilities.
For more information on water system security, see
www.epa.gov/safewater/security.


How Can  I Help Protect My
Drinking Water?

Local drinking water and wastewater systems may
be targets for terrorists and other would-be criminals
wishing to disrupt and cause harm to your community
water supplies or wastewater facilities.

Because utilities are often located in isolated areas,
drinking water sources and wastewater collection sys-
tems may cover large areas that are difficult to secure
and patrol  Residents can be educated to notice and
report any suspicious activity in and around local
water utilities. Any residents interested in protecting
  their water resources and community as a whole
  can join together with law enforcement, neighbor-
  hood watch groups, water suppliers, wastewater
  operators, and other local public health officials.
  If you witness suspicious activities, report them to
  your local law enforcement authorities.

  Examples of suspicious activity might include:

      People climbing or cutting a utility fence

  »   People dumping or discharging material  to a
  water reservoir
www.epa.gov/safewater
                    SOW Hotline: 800-426-4791

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  Unidentified truck or car parked or loitering near
  waterway or facilities for no apparent reason

  Suspicious opening or tampering with manhole
  covers, fire hydrants, buildings, or equipment
  People climbing or on top of water tanks

  People photographing or videotaping utility
  facilities, structures or equipment

  Strangers hanging around locks or gates
  Do not confront strangers. Instead report
  suspicious activities to local authorities.

  When reporting an incident:
  • State the nature of the incident
  • Identify yourself and your location
  • Identify location of activity
  • Describe any vehicle involved (color, make,
    model, plate number)
  • Describe the participants (how many, sex, race,
    color of hair, height,  weight, clothing)


For emergencies,  dial

9-1-1  or other local

emergency  response

numbers.

  For more information on water security, visit:
  www.epa.gov/safewater/security
             Report suspicious
                  activity to  local
                        authorities
www.epa.gov/safewater
                    SOW Hotline: 800-426-4791

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6.   What  Can  I  Do  If There  Is  A  Problem
       With  My  Drinking  Water?
Local incidents, such as spills and treatment prob-
lems, can lead to short-term needs for alternative
water supplies or in-home water treatment. In isolated
cases, individuals may need to rely on alternative
sources for the long term, due to their individual
health needs or problems with obtaining new drinking
water supplies.


What Alternative  Sources Of Water
Are Available?

Bottled water is sold in supermarkets and conve-
nience stores. Some companies lease or sell water
dispensers or bubblers and regularly deliver large
bottles of water to homes and businesses. It is expen-
sive compared to water from a public water system.
The bottled water quality varies among brands,
because of the variations in the source water used,
costs, and company practices.

The U.S. Food and Drug Administration (FDA) regu-
lates bottled water used for drinking. While most con-
sumers assume that bottled water is at least as safe
as tap water, there are still potential risks. Although
required to meet the same safety standards as public
water supplies, bottled water does not undergo the
same testing and reporting as water from a treatment
facility. Water that is bottled and sold in the same
www.epa.gov/safewater
state may not be subject to any federal standards at
all. Those with compromised immune systems may
want to read bottled water labels to make sure more
stringent treatments have been used, such as reverse
osmosis, distillation, UV radiation, or filtration by an
absolute 1 micron filter.

Check with NSF International to see if your bottled
water adheres to FDA and international drinking
water standards. The International Bottled Water
Association can also provide information on which
brands adhere to even more stringent requirements.
Contact information is listed in Appendix C.


Can  I Do Anything In My House To
Improve The Safety Of  My Drinking
Water?

Most people do not need to treat drinking water in
their home to make it safe. However, a home water
treatment unit can improve water's taste, or provide
a factor of safety for those people more vulnerable
to waterborne disease. There are different options
for home treatment systems. Point-of-use (POU)
systems treat water at a single tap. Point-of-entry
(POE) systems treat water used throughout the house.
POU systems can be installed in various places in
       the home, including the counter top, the
       faucet itself, or under the sink. POE systems
       are installed where the water line enters the
       house.

       POU and POE devices are based on various
       contaminant removal technologies. Filtration,
       ion exchange, reverse osmosis, and distilla-
       tion are some  of the treatment methods used.
       All types of units are generally available
       from retailers, or by mail order. Prices can
       reach well into the hundreds and sometimes
       thousands of dollars, and depending on the
       method and location of installation, plumbing
       can also add to the cost.
                    SDW Hotline: 800-426-4791

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     Treatment
       Device
        What It Does To Water
      Treatment Limitations
 Activated Carbon
 Filter
/ Adsorbs organic contaminants that
cause taste and odor problems.

i/" Some designs remove chlorination
byproducts;               :

 V Some types remove cleaning solvents
and pesticides
Is not efficient in removing metals
such as lead and copper

Does not remove nitrate, bacteria or
dissolved minerals
 Ion Exchange Unit
 (with activated
 alumina)
V Removes minerals, particularly calcium
and magnesium that make water "hard"

V Some designs remove radium and
barium

/ Removes fluoride
If water has oxidized iron or iron
bacteria, the ion-exchange resin will
become coated or clogged and lose
its softening ability
 Reverse Osmosis
 Unit
 (with carbon)
/ Removes nitrates, sodium, other dis-
solved inorganics and organic compounds

V Removes foul tastes, smells or colors

/ May also reduce the level of some
pesticides, dioxins and chloroform and
petrochemicals
Does not remove all, inorganic and
organic contaminants
 Distillation Unit
/ Removes nitrates, bacteria, sodium,
hardness, dissolved solids, most
organic Compounds, heavy rnetals, and
radionuclides              :

/ Kills bacteria
Does not remove some volatile organ-
ic contaminants, certain pesticides and
volatile solvents

Bacteria may recolonize on the cool-
ing coils during inactive periods
Activated carbon filters adsorb organic contami-
nants that cause taste and odor problems. Depending
on their design, some units can remove chlorination
byproducts, some cleaning solvents, and pesticides.
To maintain the effectiveness of these units, the car-
bon canisters must be replaced periodically. Activated
carbon filters are not efficient in removing metals
such as lead and copper.

Because ion exchange units can be used to remove
minerals from your water, particularly calcium and
magnesium, they are sold for water softening. Some
ion exchange softening units remove radium and bar-
ium from water. Ion exchange systems that employ
activated alumina are used to remove fluoride and
www.apa.gov/safewater
                               arsenate from water. These units must be regenerated
                               periodically with salt.

                               Reverse osmosis treatment units generally remove a
                               more diverse list of contaminants than other systems.
                               They can remove nitrates, sodium, other dissolved
                               inorganics, and organic compounds.

                               Distillation units boil water and condense the result-
                               ing steam to create distilled water. Depending on
                               their design, some of these units may allow vaporized
                               organic contaminants to condense back into the prod-
                               uct water, thus minimizing the removal of organics.

                               You may choose to boil your water to remove micro-
                               bial contaminants. Keep in mind that boiling reduces

                                                     SDW Hotline:  800-426-4791

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the volume of water by about 20 percent, thus con-
centrating those contaminants not affected by the
temperature of boiling water, such as nitrates and
   Maintaining Treatment Devices

   All POU and POE treatment units need main-
   tenance to operate effectively. If they are not
   maintained properly, contaminants may accu-
   mulate in the units and actually make your
   water worse. In addition, some vendors may
   make claims about their effectiveness that
   have no merit. Units are tested for their safety
   and effectiveness by two organizations, NSF
   International and Underwriters Laboratory.
   In addition, the Water Quality Association
   represents the household, commercial, indus-
   trial and small community treatment industry
   and can help you locate a professional that
   meets their code of ethics. EPA does not test
   or certify these treatment units.
                This treatment device is
                for point of use (POU).
              For more information on
     different types of devices contact
                     NSF International,
      Underwriters Laboratory, or the
             Water Quality Association
                     See Appendix Cfor
                    contact information.
pesticides. For more information on boiling water, see
page 5 of this booklet.

No one unit can remove everything. Have your water
tested by a certified laboratory prior to purchasing
any device. Do not rely on the tests conducted by
salespeople that want to sell you their product.


Where Can I Learn More About
Home Treatment Systems?

Your local library has articles, such as those found
in consumer magazines, on the effectiveness of these
devices.

The U.S. General Accounting Office published
a booklet called Drinking Water: Inadequate
Regulation of Home Treatment Units Leaves
Consumers At Risk (December 1991). To read this
booklet, visit www.gao.gov and search for document
number RCED-92-34, or call (202) 512-6000.
www.epa.gov/safewater
                    SOW Hotline: 800-426-4791

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7.   How  Safe  Is The  Drinking  Water
       In  My  Household  Well?
EPA regulates public water systems; it does not have
the authority to regulate private wells. Approximately
15 percent of Americans rely on their own pri-
vate drinking water supplies (Drinking Waterfront
Household Wells, 2002), and these supplies are not
subject to EPA standards. Unlike public drinking
water systems serving many people, they do not have
experts regularly checking the water's source and its
quality before it is sent to the tap.  These households
must take special precautions to ensure the protection
and maintenance of their drinking water supplies.

Drinking Water from Household Wells is an EPA
publication available to specifically address special
concerns of a private drinking water supply. To learn
more, or to obtain a copy, visit www.epa.gov/safewater/
privatewells, or call the Safe Drinking Water Hotline.


How Much Risk Can I Expect?

The risk of having problems depends on how good
your well is—how well it was built and located,
and how well you
maintain it.  It also
depends on your
local environment.
That includes the
quality of the aqui-
fer from which your
water is drawn and
the human activities
going on in your
area that can affect
your well.

Several sources of
pollution are easy to
spot by sight, taste, or smell.  However, many serious
problems can be found only by testing your water.
Knowing the possible threats in your area will help
you decide the kind of tests you may need.
What Should I Do?

There are six basic steps you can take to help protect
your private drinking water supply:

1.  Identify potential problem sources.

2.  Talk with local experts.

3.  Have your water tested periodically.

4.  Have the test results interpreted and explained
   clearly.

5.  Set and follow a regular maintenance schedule
   for your well, and keep up-to-date records.

6.  Immediately remedy any problems.

Identify Potential Problem Sources

Understanding and spotting possible pollution sources
is the first step to safeguarding your drinking water.
If your drinking water comes from a well, you may
also have a septic system.  Septic systems and other
                on-site wastewater disposal sys-
                tems are major potential  sources
                of contamination of private water
                supplies if they are poorly main-
                tained or located improperly, or if
                they are used for disposal of toxic
                chemicals. Information on septic
                systems is available from local
                health departments, state agen-
                cies, and the National  Small Flows
                Clearinghouse (www.epa.gov/owm/
                mab/smcomm/nsfc.htm) at (800)
                624-8301. A septic system design
                manual  and guidance on  system
maintenance are available from EPA (www.epa.gov/
OW-OWM.html/mtb/decent/homeowner.htm}.
www.epa.gov/safewater
                     SDW Hotline: 800-426-4791

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Talk With Local Experts

Ground water conditions vary greatly from place to
place, and local experts can give you the best infor-
mation about your drinking water supply. Some
examples are your health department's "sanitarian,"
local water-well contractors, public water system
officials, county extension agents of the Natural
Resources Conservation Service (NRCS), local or
county planning commissions, and your local library.

Have Your Water Tested Periodically

Test your water every year  for total coliform bacteria,
nitrates, total dissolved solids, and pH levels.  If you
suspect other contaminants, test for these as well.
As the tests can be expensive, limit them to possible
problems specific to your situation.  Local experts
can help you identify these contaminants. You should
also test your water after replacing or repairing any
part of the system, or if you notice any change in
your water's look, taste, or smell.

Often, county health departments perform tests for
bacteria and nitrates. For other substances, health
departments, environmental offices, or county gov-
ernments should have a list of state-certified labora-
tories.  Your State Laboratory Certification  Officer
can also provide you with this list. Call the Safe
Drinking Water Hotline for the name and number of
your state's certification officer.  Any laboratory you
use should be certified to do drinking water testing.

Have Your Test Results Interpreted And
Explained Clearly

Compare your well's test results to federal and
state drinking water standards (see Appendix A, or
visit www.epa.gov/safewater/mcl.html or call the Safe
Drinking Water Hotline). You may need to consult
experts to aid you in understanding your results, such
as the state agency that licenses water well  contrac-
tors, your local health department, or your state's
drinking water program.
Protecting Your Ground Water
Supply

• Periodically inspect exposed parts of the
  well for problems such as:
  -  Cracked, corroded, or damaged well
     casing
  -  Broken or missing well  cap
  -  Settling and cracking of surface seals.
• Slope the area around the well to drain sur-
  face runoff away from the well.
• Install a well cap or sanitary seal to prevent
  unauthorized use of, or entry into, the well.
• Disinfect drinking water wells at least once
  per year with bleach or hypochlorite gran-
  ules, according to the manufacturer's direc-
  tions.
• Have the well tested once a year for coli-
  form bacteria, nitrates, and other constitu-
  ents of concern.
• Keep accurate records of any well main-
  tenance, such  as disinfection or sediment
  removal, that may require the use of chem-
  icals in the well.
• Hire a certified well  driller  for any new well
  construction, modification, or abandon-
  ment and  closure.
• Avoid mixing or using pesticides, fertilizers,
  herbicides, degreasers, fuels, and other
  pollutants near the well.
• Do not dispose of wastes  in dry wells or in
  abandoned wells.
• Do not cut off the well casing below the
  land surface.
• Pump and inspect septic systems as often
  as recommended by your local health
  department.
• Never dispose of hazardous materials in a
  septic system.
www.epa.gov/safewater
                   SOW Hotline: 800-426-4791

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Set A Regular Maintenance Schedule For
Your Well And Your Septic System

Proper well and septic system construction and con-
tinued maintenance are keys to the safety of your
water supply.  Your state water well and septic system
contractor licensing agency, local health department,
or local public water system professional can provide
information on well construction.  Make certain your
contractors are licensed by the state, if required, or
certified by the National Ground Water Association.

Maintain your well, fixing problems before they
reach crisis levels, and keep up-to-date
records of well installation and repairs, as
well as plumbing and water costs. Protect
your own well area from contamination.


Immediately Remedy Any
Problems

If you find that your well water is con-
taminated, fix the problem as soon as
possible. Consider connecting into a
nearby community water system, if one is
available. You may want to install a water
treatment device to remove impurities.
Information on these devices is provided
         Animal waste
                          can
           contaminate
                        your
           water supply
on page 16. If you connect to a public water system,
remember to close your well properly.

After A Flood-Concerns And Advisories

•  Stay away from well pump to avoid electric shock.

•  Do not drink or wash from a flooded well.

•  Pump the well until water runs clear.

•  If water does not run clear, contact the county or
   state health department or extension service for
   advice.
        CURB AND CLEAN UP
www.epa.gov/safewater
                    SDW Hotline: 800-426-4791

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8.   What  You  Can  Do To  Protect  Your
       Drinking  Water
Drinking water protection is a shared responsibility.
Many actions are underway to protect our nation's
drinking water, and there are many opportunities for
citizens to become involved.
Be Involved!

EPA activities to protect drinking water include set-
ting drinking water standards and overseeing the
work of states that enforce federal standards—or
stricter ones set by the individual state. EPA holds
many public meetings on issues ranging from pro-
posed drinking water standards to the development of
databases. You can also comment on proposed drafts
of other upcoming EPA documents. A list of public
meetings and regulations open for comment can be
found at www.epa.gov/safewater/pubinput/html


Be Informed!

•  Read the annual Consumer Confidence Report
  provided by your water supplier.  Some Consumer
  Confidence Reports are available at www.epa.gov/
  safewater/dwinfo.htm.

•  Use information from your state's Source Water
  Assessment to learn about potential threats to your
  water source.

•  If you are one of the 15 percent of Americans who
  uses a private source of drinking water—such as
  a well, cistern, or spring—find out what activi-
  ties are taking place in your watershed that may
  impact your drinking water; talk to local experts/
  test your water periodically; and maintain your
  well properly.

•  Find out if the Clean Water Act standards for your
  drinking water source are intended to protect water
  for drinking, in addition to fishing and swimming.
www.epa.gov/safewater
Be Observant!

•  Look around your watershed and look for
  announcements in the local media about activities
  that may pollute your drinking water.

•  Form and operate a citizens watch network with-
  in your community to communicate regularly with
  law enforcement, your public water supplier and
  wastewater operator.  Communication is key to a
  safer community!

•  Be alert. Get to know your water/wastewater utili-
  ties, their vehicles, routines and their personnel.

•  Become aware of your surroundings. This
  will help you to recognize suspicious activity as
  opposed to normal daily activities.
  Other Ways To Get Involved

  • Attend public hearings on new construc-
    tion, storm water permitting, and town
    planning.
  • Keep your public officials accountable by
    asking to see their environmental impact
    statements.
  • Ask questions about any issue that may
    affect your water source.
  • Participate with your government and your
    water system as they make funding deci-
    sions.
  • Volunteer or help recruit volunteers to par-
    ticipate in your community's contaminant
    monitoring activities.
  • Help ensure that local utilities that protect
    your water have adequate resources to do
    their job.
                    SOW Hotline: 800-426-4791

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  If you see any suspicious activities in or around
  your water supply, please notify local authorities or
  call 9-1-1 immediately to report the incident.
   Stormwater runoff threatens our sources of
   drinking water.  As this water washes over
   roofs, pavement, farms and grassy areas,; it
   picks up fertilizers, pesticides and litter, and
   deposits them in surface water and ground
   water.  Here are some other threats to our
   drinking water:

   Every year:
   •  We apply 67  million pounds of pesticides
     that contain toxic and harmful chemicals to
     our lawns.
   •  We produce more than 230 million tons of
     municipal solid water—approximately five
     pounds of trash or garbage par person per
     day—that contain bacteria, nitrates, virus-
     es,  synthetic  detergents, and household
     chemicals.
   •  Our more than 12 million recreational
     and houseboats and 10,000 boat marinas
     release solvents, gasoline, detergents, and
     raw sewage directly into our rivers, lakes
     and streams.
               Don't Contaminate!

                      Reduce paved areas: use
               permeable surfaces that allow rain to
               soak through, not run off.

               •       Reduce or eliminate pesticide
               application:  test your soil before
               applying chemicals, and use plants
               that require little or no water, pesti-
               cides, or fertilizers.

                      Reduce the amount of trash
               you create: reuse and recycle.

               •       Recycle used oil: 1  quart of
               oil can  contaminate 2 million gallons
  of drinking water—take your used oil and anti-
  freeze to a service station or recycling center.

• Take the bus instead  of your car one day a week:
  you could prevent 33 pounds of carbon dioxide
  emissions each day.

• Keep pollutants away from boat marinas and
  waterways: keep boat motors well-tuned to prevent
  leaks, select nontoxic cleaning products and use
  a drop cloth, and clean and maintain boats away
  from the water.

For more information on how you can help pro-
tect your local  drinking water source, call the Safe
Drinking Water Hotline, or check www.epa.gov/
safewater/publicoutreach. Additional resources are
listed in Appendix C.
www.epa.gov/safewater
                      SOW Hotline: 800-426-4791

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Appendix  A:     National  Primary  Drinking
        Water  Standards  as  of  10/03
       Acrylamide
            Nervous system or blood problems;
            increased risk of cancer
                                Added to water during sewage/
                                wastewater treatment
                                 zero
       Alachlor
   0.002
Eye, liver, kidney or spleen problems;
anemia; increased risk of cancer
Runoff from herbicide used on row
crops
                                                                                                         zero
       Alpha particles
 15 picocu-
ries per Liter
  fpCi/L)
Increased risk of cancer
Erosion of natural deposits of certain
minerals that are radioactive and
may emit a form of radiation known
as alpha radiation
                                                                 zero
       Antimony
   0.006
Increase in blood cholesterol; decrease
in blood sugar
Discharge from petroleum refineries;
fire retardants; ceramics; electronics;
solder
   0.006
       Arsenic
0.010 as of
  1/23/06
Skin damage or problems with circula-
tory systems, and may have increased
risk of getting cancer
Erosion of natural deposits; runoff
from orchards; runoff from glass &
electronics production wastes
       Asbestos {fibers >10
       micrometers)
 7 million
 fibers per
 Liter (MFL)
Increased risk of developing benign
intestinal polyps
Decay of asbestos cement in water
mains; erosion of natural deposits
  7 MFL
       Atrazine
  0.003
Cardiovascular system or reproductive
problems
Runoff from herbicide used on row
crops
  0.003
       Barium
            Increase in blood pressure
                                Discharge of drilling wastes; dis-
                                charge from metal refineries; erosion
                                of natural deposits
       Benzene
  0.005
Anemia; decrease in blood platelets;
increased risk of cancer
Discharge from factories; leaching
from gas storage tanks and landfills
                                                                                                        zero
       Benzo(a}pyrene (PAHs)
  0.0002
Reproductive difficulties; increased risk
of cancer
Leaching from linings of water stor-
age tanks and distribution lines
                                                                             zero
       Beryllium
  0.004
Intestinal lesions
Discharge from metal refineries and
coal-burning factories; discharge
from electrical, aerospace, and
defense industries
  0.004
       Beta particles and pho-
       ton emitters
4 millirems
 per year
Increased risk of cancer
Decay of natural and man-made
deposits of certain minerals that are
radioactive and may emit forms of
radiation known as photons and beta
radiation
                                                                 zero
       Bromate
  0.010
Increased risk of cancer
Byproduct of drinking water
disinfection
                                                                                                        zero
       Cadmium
  0.005
Kidney damage
Corrosion of galvanized pipes;
erosion of natural deposits; discharge
from metal refineries; runoff from
waste batteries and paints
  0.005
       Carbofuran
   0.04
Problems with blood, nervous system,
or reproductive system
Leaching of soil fumigant used on
rice and alfalfa
   0.04
       Carbon tetrachloride
  0.005
Liver problems; increased risk of cancer
Discharge from chemical plants and
other industrial activities
                                                                                                        zero
       Chloramines {as Cl2)
MRDL=4.01
Eye/nose irritation; stomach discomfort;
anemia
Water additive used to control
microbes
MRDLG=41
 LEGEND
   0     Disinfectant
          Inorganic Chemical
                        Organic Chemical
www.epa.gov/safewater
                                                        SOW Hotline: 800-426-4791

-------
lull
lii
D
D
DBF
OC
IOC
IOC
M
IOC
OC
OC
OC
OC
•£!••
Bu9
OC
OC
OC
OC
OC
OC
OC
OC
^•^^^HW
Chlordane
	 _ 	
Chlorine (as Cl2)
Chlorine dioxide
(as CI02)
Chlorite
Chlorobenzene
Chromium (total)
Copper
Cryptosporidium

Cyanide
(as free cyanide)
2,4-D
Dalapon
1,2-Dibromo-3-
chloropropane (DBCP)
o-Dichlorobenzene


1,2-Dichloroethane

1,1-Dichloroethylene
cis-1,2-Dichloroethylene
trans- 1,2-
Dichloroethylene
Dichloromethane
1,2-Dichloropropane
Di(2-ethylhexyl) adipate
Di(2-ethylhexyl)
phthalate
Dinoseb
^^^m^m
0.002
MRDL=4.Q1
MRDL=0.81
1.0
0.1
0.1
TT7;
Action
Level =
1.3
TT3

0.2
0.07
0.2
0.0002
0.6
0.075

0.005

0.007
0.07
0.1
0.005
0.005
04
0.006
0.007
^^^M^HB^^HH^^^BUBBB
Liver or nervous system problems;
increased risk of cancer
Eye/nose irritation; stomach discomfort
Anemia; infants & young children:
nervous system effects
Anemia; infants & young children:
nervous system effects
Liver or kidney problems
Allergic dermatitis
Short-term exposure: Gastrointestinal
distress. Long-term exposure: Liver or
kidney damage. People with Wilson's
Disease should consult their personal
doctor if the amount of copper in their
water exceeds the action level
Gastrointestinal illness (e.g., diarrhea,
vomiting, cramps)
Nerve damage or thyroid problems
Kidney, liver, or adrenal gland problems
Minor kidney changes
Reproductive difficulties; increased risk
of cancer
Liver, kidney, or circulatory system
problems

changes in blood
Increased risk of cancer

Liver problems
Liver problems
Liver problems
Liver problems; increased risk of cancer
Increased risk of cancer
Weight loss, liver problems, or possible
reproductive difficulties
Reproductive difficulties; liver problems;
increased risk of cancer
Reproductive difficulties
Residue of banned termiticide
Water additive used to control
microbes
Water additive used to control
microbes
Byproduct of drinking water
disinfection
Discharge from chemical and agricul-
tural chemical factories
Discharge from steel and pulp mills;
erosion of natural deposits
Corrosion of household plumbing
systems; erosion of natural deposits
Human and animal fecal waste

Discharge from steel/metal factories;
discharge from plastic and fertilizer
factories
Runoff from herbicide used on row
crops
Runoff from herbicide used on rights
of way
Runoff/leaching from soil fumigant
used on soybeans, cotton, pine-
apples, and orchards
Discharge from industrial chemical
factories

factories
Discharge from industrial chemical
factories
Discharge from industrial chemical
factories
Discharge from industrial chemical
factories
Discharge from industrial chemical
factories
Discharge from drug and chemical
factories
Discharge from industrial chemical
factories
Discharge from chemical factories
Discharge from rubber and chemical
factories
Runoff from herbicide used on soy-
beans and vegetables
zero
MRDLG=41
MRDLG=0.81
0.8
0.1
0.1
1.3
zero

0.2
0.07
0.2
zero
0.6
0.075

zero

0.007
0.07
0.1
zero
zero
0.4
zero
0.007
 LEGEND
    D     Dinsinfectant
Inorganic Chemical
Organic Chemical
www.epa.gov/safewater
                                                   SDVU Hotline: 800-426-4791

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         Heterotrophic plate
         count (HPC)
  LEGEND

    P      Disinfectant
                                                 Reproductive difficulties; increased risk
                                                 of cancer
                                                Cataracts
                                                Stomach and intestinal problems
                                                Liver problems
                                                Increased cancer risk, and over a long
                                                period of time, stomach problems
                                                Liver or kidney problems
                                                Problems with liver, stomach, reproduc-
                                                tive system, or kidneys; increased risk
                                                of cancer
                                                Bone disease (pain and tenderness of
                                                the bones); children may get mottled
                                                teeth
                                                Gastrointestinal illness {e.g., diarrhea,
                                                vomiting, cramps)
                                                Kidney problems; reproductive
                                                difficulties
                                                Increased risk of cancer
                                                Liver damage; increased risk of cancer
                                                Liver damage; increased risk of cancer
  HPC has no health effects; it is an
  analytic method used to measure the
  variety of bacteria that are common in
  water. The lower the concentration of
  bacteria in drinking water, the better
  maintained the water system is.
                                                Liver or kidney problems; reproductive
                                                difficulties; increased risk of cancer
                                                Kidney or stomach problems
                                                Infants and children: Delays in physical
                                                or mental development; children could
                                                show slight deficits in attention span
                                                and learning abilities; Adults: Kidney
                                                problems; high blood pressure
                                                Legionnaire's Disease, a type of
                                                pneumonia
                                                Liver or kidney problems
                                                Kidney damage
                                                Reproductive difficulties
                                          Emissions from waste incineration
                                          and other combustion; discharge
                                          from chemical factories
                                          Runoff from herbicide use
                                          Runoff from herbicide use
                                          Residue of banned insecticide
                                          Discharge from industrial chemical
                                          factories; an impurity of some water
                                          treatment chemicals
                                          Discharge from petroleum refineries
                                          Discharge from petroleum refineries
                                          Water additive which promotes
                                          strong teeth; erosion of natural
                                          deposits; discharge from fertilizer
                                          and aluminum factories
                                          Human and animal fecal waste
                                          Runoff from herbicide use
                                          Byproduct of drinking water
                                          disinfection
                                          Residue of banned termiticide
                                          Breakdown of heptachlor
          HPC measures a range of bacteria
          that are naturally present in the
          environment
                                          Discharge from metal refineries and
                                          agricultural chemical factories
                                          Discharge from chemical factories
                                          Corrosion of household plumbing
                                          systems; erosion of natural deposits
                                          Found naturally in water; multiplies in
                                          heating systems
                                          Runoff/leaching from insecticide used
                                          on cattle, lumber, gardens
                                          Erosion of natural deposits; dis-
                                          charge from refineries and factories;
                                          runoff from landfills and croplands
                                          Runoff/leaching from insecticide used
                                          on fruits, vegetables, alfalfa, livestock
Inorganic Chemical
Organic Chemical
                                                   zero
                                                   0.02
                                                    0.1
                                                   0.002
                                                   zero
                                                    0.7
                                                   zero
                                                    4.0
                                                                                   zero
                                                    0.7
                                                   n/a6
                                                                                   zero
                                                   zero
n/a
                                                   zero
                                                   0.05
                                                   zero
                                                   zero
                                                  0.0002
                                                   0.002
                                                   0.04
www.epa.gov/safewater
                                                                                                       SOW  Hotline:  800-426-4791

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                                                Infants below the age of six months who
                                                drink water containing nitrate in excess
                                                of the MCL could become seriously i
                                                and, if untreated, may die. Symptoms
                                                include shortness of breath and blue-
                                                baby syndrome.
                                                                               Runoff from fertilizer use; leaching
                                                                               from septic tanks, sewage; erosion of
                                                                               natural deposits
Nitrate (measured as
Nitrogen)
                                                Infants below the age of six months who
                                                drink water containing nitrite in excess
                                                of the MCL could become seriously i
                                                and, if untreated, may die. Symptoms
                                                include shortness of breath and blue-
                                                baby syndrome.
                                                                               Runoff from fertilizer use; leaching
                                                                               from septic tanks, sewage; erosion of
                                                                               natural deposits
Nitrite (measured as
Nitrogen)
                                                Slight nervous system effects
                                                                               Runoff/leaching from insecticide used
                                                                               on apples, potatoes, and tomatoes
Oxamyl (Vydate)
                                                Liver or kidney problems; increased
                                                cancer risk
                                                                               Discharge from wood-preserving
                                                                               factories
Pentachlorophenol
                                                Skin changes; thymus gland problems
                                                immune deficiencies; reproductive or
                                                nervous system difficulties; increased
                                                risk of cancer
                                                                               Runoff from landfills; discharge of
                                                                               waste chemicals
Polychlorinated biphe
nyls (PCBs
                                                Increased risk of cancer
Radium 226 and
Radium 228 (combined)
                                                                               Erosion of natural deposits
                                                Hair or fingernail loss; numbness in fin
                                                gers or toes; circulatory problems
                                                                               Discharge from petroleum refineries
                                                                               erosion of natural deposits; dis-
                                                                               charge from mines
                                                Prob ems with blood
                                                Liver, kidney, or circulatory system
                                                problems
                                                                               Discharge from rubber and plastic
                                                                               factories; leaching from landfills
                                                Liver problems; increased risk of cancer
                                                                               Discharge from factories and dry
                                                                               cleaners
Tetrachloroethylene
                                                Hair loss; changes in blood; kidney,
                                                intestine, or liver problems
                                                                               Leaching from ore-processing sites
                                                                               discharge from electronics, glass,
                                                                               and drug factories
                                                Nervous system, kidney, or liver
                                                problems
                                                                               Discharge from petroleum factories
                                                Not a health threat in itself; it is used to
                                                indicate whether other potentially harm-
                                                   bacteria may be present^
                                                                               Coliforms are naturally present tn the
                                                                               environment as well as feces; fecal
                                                                               coliforms and E. coli only come from
                                                                               human and animal fecal waste
Total Coliforms (includ
ing fecal coliform and
E. co/A
                                                Liver, kidney or central nervous system
                                                problems; increased risk of cancer
                                                                               Byproduct of drinking water
                                                                               disinfection
Total Trihalomethanes
(TTHMs)
                                     0.080
                                  after 12/31/
                                      03
                                                Kidney, liver, or thyroid problems
                                                increased risk of cancer
                                                                               Runoff/leaching from insecticide used
                                                                               on cotton and cattle
                                                                                       Residue of banned herbicide
2,4,5-TP Silvex
                                                Changes in adrenal glands
                                                                               Discharge from textile finishing
                                                                               factories
1,2,4-Tricnlorobenzene
                                                Liver, nervous system, or circulatory
                                                problems
                                                                               Discharge from metal degreasmg
                                                                               sites and other factories
1.1.1-mchloroethane
  LEGEND

    D      Disinfectant
                                     Inorganic Chemical
                                                                     Organic Chemical
www.epa.gov/safewater
                                                                                              SOW Hotline:  800-426-4791

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                                                                                                       Discharge from industrial chemical
                                                                                                       factories
1,1,2-Tncnloroetnane
Liver, kidney, or immune system
problems
                                                                                                       Discharge from metal degreasing
                                                                                                       sites and other factories
mchloroetnylene
Liver problems; increased risk of cancer
                                                         Turbidity is a measure of the cloudiness
                                                         of water. It is used to indicate water
                                                         quality and filtration  effectiveness (e.g.,
                                                         whether disease-causing organisms
                                                         are present). Higher turbidity levels are
                                                         often associated with higher levels of
                                                         disease-causing microorganisms such
                                                         as viruses, parasites and some bacteria
                                                         These organisms  can cause symptoms
                                                         such as nausea, cramps, diarrhea, and
                                                         associated headaches.
                                                                                                      Erosion of natural deposits
                               30 ug/L
                               as of12/
                                08/03
Increased risk of cancer, kidney toxicity
                                                                                                      Leaching from PVC pipes; discharge
                                                                                                      from plastic factories
                                              ncreased risk of cancer
                                                                                                      Human and animal fecal waste
                                             Gastrointestinal illness (e.g., diarrhea
                                             vomiting, cramps)
                                                                                                      Discharge from petroleum factories;
                                                                                                      discharge from chemical factories
                                             Nervous system damage
             Disinfectant
                                           Inorganic Chemical
                                                                                          Organic Chemical
 NOTES

 1  Definitions

   •   Maximum Contaminant Level Goal (MCLG)—The level of a contaminant in drinking
      water below which there is no known or expected risk to health. MCLGs allow for a
      margin of safety and are non-enforceable public health goals.

   •   Maximum Contaminant Level (MCL)—The highest level of a contaminant that is
      allowed in drinking water. MCLs are set as close to MCLGs as feasible using the
      best available treatment technology and taking cost into consideration, MCLs are
      enforceable standards.

   •   Maximum Residual Disinfectant Level Goal (MRDLG)—The level of a drink-
      ing water disinfectant below which there is no known or expected risk to health.
      MRDLGs do not reflect the benefits of the use of disinfectants to control microbial
      contaminants,

   •   Maximum Residual Disinfectant Level (MRDL)—The highest level of a disinfectant
      allowed in drinking water. There is convincing evidence that addition of a disinfec-
      tant is necessary for control of microbial contaminants.

   •   Treatment Technique (TT)—A required process intended to reduce the level of a
      contaminant in drinking water.

 2  Units are in milligrams per liter (rng/L) unless otherwise noted. Milligrams per liter are
   equivalent to parts per million (ppm).

 3  EPA's surface water treatment rules require systems using surface water or ground
   water under the direct influence of surface water to (1) disinfect their water, and (2) fil-
   ter their water or  meet criteria for avoiding filtration so that the following contaminants
   are controlled at the following levels:

   •   Cryptosporidium (as of 1/1/02 for systems serving >10,000 and  1/14/05 for systems
      serving <10,000) 99 percent removal.

   •   Giardia lamblia: 99.9 percent removal/inactivation

   •   Viruses: 99.99 percent removal/inactivation

   •   Legionella: No limit, but EPA believes that if Giardia and viruses are removed/
      inactivated,  Legionella will also be controlled,

   •  Turbidity: At no time can turbidity (cloudiness of water) go above 5 nephelolometric
     turbidity units (NTU); systems that filter must ensure that the turbidity go no higher
      than  1 NTU (0.5 NTU for conventional or direct filtration) in at least 95 percent
     of the daily samples in any month. As of January 1, 2002, for systems servicing
      >10,000, and January 14, 2005, for systems servicing <10,000,  turbidity may never
     exceed 1 NTU, and must not exceed 0.3 NTU in 95 percent of daily samples in any
      month.
                                                                            •   HPC: No more than 500 bacterial colonies per milliliier

                                                                            •   Long Term 1 Enhanced Surface Water Treatment (Effective Date: January 14,
                                                                               2005); Surface water systems or (GWUDI) systems serving fewer than 10,000
                                                                               people must comply with the applicable Long Term 1 Enhanced Surface Water
                                                                               Treatment Rule provisions (e.g. turbidity standards, individual filter monitoring,
                                                                               Ctyptosporidium removal requirements, updated watershed control requirements for
                                                                               unfiltered systems),

                                                                            •   Filter Backwash Recycling: The Filter Backwash Recycling Rule requires systems
                                                                               that recycle to return specific recycle flows through all processes of the system's
                                                                               existing conventional or direct filtration system or at an alternate location approved
                                                                               by the state.

                                                                         4  No more than 5.0 percent samples total coliform-positive in a month. (For water sys-
                                                                            tems that collect fewer than 40 routine samples per month,  no more than one sample
                                                                            can be total coliform-positive per month.) Every sample that has total coliform must be
                                                                            analyzed for either fecal coliforms or E. colt. If two consecutive TC-positive samples,
                                                                            and one is also positive for E. coli fecal coliforms, system has an acute MCL violation,

                                                                         5  Fecal coliforrn and £. coli are bacteria whose presence indicates that the water may
                                                                            be contaminated with human or animal wastes. Disease-causing microbes (patho-
                                                                            gens) in these wastes can cause diarrhea, cramps, nausea, headaches, or other
                                                                            symptoms. These pathogens may pose a special health risk for infants, young chil-
                                                                            dren, and people with severely compromised immune systems.

                                                                         6  Although there is no  collective MCLG for this contaminant group, there are individual
                                                                            MCLGs for some of the individual contaminants:

                                                                            •   Haloacetic acids:  dichloroacetic acid (zero); trichloroacetic acid (0,3 mg/L)

                                                                            •  Tri ha lorn ethanes:  bromodichloromethane (zero); bromoform (zero); dibromochloro-
                                                                              methane (0.06  mg/L)

                                                                         7  Lead and copper are regulated by a Treatment Technique that requires systems to
                                                                            control the corrosiveness  of their water. If more than 10 percent of tap water samples
                                                                            exceed the action  level, water systems must take additional steps. For copper, the
                                                                            action level is 1.3 mg/L, and for lead is 0.015 rng/L

                                                                         8  Each water system must certify, in writing, to the state (using third-party or manufac-
                                                                            turers certification) that when it uses acrylamide and/or epichlorohydrin to treat water,
                                                                            the combination (or product) of dose and monomer level does not exceed the levels
                                                                            specified, as follows: Acrylamide = 0.05 percent dosed at 1  mg/L (or equivalent);
                                                                            Epichlorohydrin - 0.01 percent dosed at 20 mg/L (or equivalent).
www.epa.gov/safewater
                                                                                                            SOW Hotline: 800-426-4791

-------
Appendix  B:   References
US  EPA Publications

25 Years of the Safe Drinking
Water Act: History B Trends
EPA816-R-99-007
December 1999

Community Water Systems
Survey 2000,  Volume I
EPA815-R-02-0054
December 2002

Drinking Water Costs and
Federal Funding
EPA810-F-99-014
December 1999

Drinking Water from Household
Weils
EPA816-K-02-003
January 2002

Drinking Water Priority
Rulemaking:  Microbial and
Disinfection Byproduct Rules
EPA816-F-01-012
June 2001

Drinking Water Treatment
EPA810-F-99-013
December 1999

Factoids: Drinking Water
and Ground Water Statistics for
2001
EPA815-K-02-004
May 2002

Factoids: Drinking Water and
Ground Water Statistics for 2002
EPA816-K-03-001
January 2003
Fact Sheet:  1999 Drinking
Water Infrastructure Needs
Survey
EPA816-F-01-001
February 2001

"Investing in America's Water
Infrastructure" Keynote
Address by G. Tracy Mehan III
to the Schwab Capital Markets'
Global Water Conference
April 2003

Protect Your Drinking Water
EPA816-F-02-012
September 2002

Public Access to Information &
Public Involvement
EPA810-F-99-021
December 1999

Report to Congress: EPA
Studies on Sensitive
Subpopulations and Drinking
Water Contaminants
EPA815-R-00-015
December 2000

Safe Drinking Water Act-
Protecting America's Public
Health
EPA816-H-02-003
January 2002

Safe Drinking Water Act:
Underground Injection Control
Program: Protecting Public
Health and Drinking Water
Resources
EPA816-H-01-003
August 2001
The Clean Water and Drinking
Water Infrastructure Gap
Analysis
EPA816-F-02-017
September 2002

The Drinking Water State
Revolving Fund: Protecting the
Public Through Drinking Water
Infrastructure Improvements
EPA819-F-00-028
November 2001

Understanding the Safe Drinking
Water Act
EPA810-F-99-008
December 1999

Using Water Wisely in the Home
EPA800-F-02-001
June 2001
Publications From
Outside Sources

Centers for Disease Control
and Prevention. Morbidity
and Mortality Weekly Report:
Surveillance for Waterborne-
Disease Outbreaks-United
States-1999-2000.
November 22, 2002

Congressional Budget
Office. Future Investment in
Drinking Water & Wastewater
Infrastructure
November 2002
www.epa.gov/safewater
                                    SOW Hotline: 800-426-4791

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Appendix  C:   Sources  of Additional
       Information
American Water Works Association
Public Affairs Department
6666 West Quincy Avenue
Denver, CO  80235
Phone (303) 794-7711
www,awwa. org

Association of  Metropolitan Water Agencies
1717 K Street NW
Suite 1102
Washington, DC 20036
Phone (202) 331-2820
www.amwa-water.org

Association of  State Drinking Water
Administrators
1120 Connecticut Avenue NW
Suite 1060
Washington, DC 20036
Phone (202) 293-7655
www.asdwa.org

Clean Water Action
4455 Connecticut Avenue NW Suite A300
Washington, DC 20008
Phone (202) 895-0420
www.cleanwater.org

Consumer Federation of America
1424 16th Street NW
Suite 604
Washington, DC 20036
Phone (202) 387-6121
www. consumerfed. org

The Groundwater Foundation
P.O. Box 22558
Lincoln, NE 68542
Phone (800) 858-4844
www.groundwater. org

The Ground Water Protection Council
13308 N. Mac Arthur
OKC, OK 73142
Phone (405) 516-4972
www.gwpc.org

www.epa.gov/safewater
International Bottled Water Association
1700 Diagonal Road
Suite 650
Alexandria, VA 22314
Phone (703) 683-5213
Information Hotline 1-800-WATER-11
ibwainfo(5)bottledwater.org

National Association of Regulatory Utility
Commissioners
Phone (202) 898-2200
www.naruc.org

National Association of Water Companies
1725 K Street NW
Suite 1212
Washington, DC 20006
Phone (202) 833-8383
www.nawc.org

National Drinking Water Clearinghouse
West Virginia University
P.O. Box 6064
Morgantown, WV 26506
Phone (800) 624-8301
www.ndwc. wvu. edu

National Rural Water Association
2915 South 13th Street
Duncan, OK 73533
Phone (580) 252-0629
www.nrwa.org

Natural Resources Defense Council
40 West 20th Street
New York, NY 10011
Phone (212) 727-2700
www.nrdc.org

NSF International
P.O. Box 130140
789 North Dixboro Road
Ann Arbor,  Ml 48113
Phone (800) NSF-MARK
www.nsf.org
                   SOW Hotline: 800-426-4791

-------
Rural Community Assistance Program
1522 K Street NW
Suite 400
Washington, DC  20005
Phone (202) 408-1273
www.rcao.ora

Underwriters Laboratories
Corporate Headquarters
333 Pflngsten Road
Northbrook, IL 60062-2096
Phone (877) 272-8800
www. ul. com

Water Quality Association
4151 Naperville Road
Lisle, IL 60532
Phone (630) 505-0160
www.wqa.org

U.S. Environmental Protection Agency Water
Resource Center
1200 Pennsylvania Avenue NW
RC-4100
Washington, DC  20460
SDWA Hotline (800) 426-4791
www.epa.aov/safewater

Water Systems Council
National Programs Office
101 30th Street NW
Suite 500
Washington, D.C. 20007
Phone: (202) 625-4387
Wellcare Hotline 888-395-1033
www.watersvstems council.ora

EPA Region 1
(CT, ME, MA, NH, Rl, VT)
Phone (617) 918-1111
Phone (617) 918-1614
(UIC issues)

EPA Region 2
(NJ, NY, PR, VI)
Phone (212) 637-5000
Phone (212) 637-4232
(UIC issues)
EPA Region 3
(DE, DC, MD, PA, VA, WV)
Phone (215) 814-5700
Phone (215) 814-5445
{UIC issues)

EPA Region 4
(AL, FL, GA, KY, MS, NC, SC, TN)
Phone (404) 562-9900
Phone (404) 562-9452
{UIC issues)

EPA Region 5
(IL, IN, Ml, MN, OH,WI)
Phone (312) 886-2000
Phone (312) 886-1492
(UIC issues)

EPA Region 6
(AR, LA, NM, OK,TX)
Phone (214) 665-6444
Phone (214) 665-7183
(UIC issues)

EPA Region 7
(IA, KS, MO, NE)
Phone (913) 551-7003
Phone (913) 551-7030
(UIC issues)

EPA Region 8
(CO, MT, ND, SD, UT, WY)
Phone (303) 312-6312
Phone (303) 312-6242
(UIC issues)

EPA Region 9
(AZ, CA, HI, NW, AS GU)
Phone (415) 947-8000
Phone (415) 947-1834
(UIC issues)

EPA Region 10
(AK, ID, OR, WA)
Phone (206) 553-1200
Phone (206) 553-1901
(UIC issues)
www.epa.gov/safewater
                     SOW Hotline: 800-426-4791

-------
Appendix D:   Glossary
Aquifer
A natural underground layer, often of sand or
gravel, that contains water
Coliform
A group of related bacteria whose presence in
drinking water may indicate contamination by
disease-causing microorganisms


Community Water System (CWS)
A water system that supplies drinking water to 25
people or more year-round in their residences


Contaminant
Anything found in water (including microorgan-
isms, radionuclides, chemicals, minerals, etc.)
which may be harmful to human health


Cryptosporidium
Microorganism found commonly in lakes and rivers
which is highly resistant to disinfection.


Disinfectant
A chemical (commonly chlorine, chloramines, or
ozone) or  physical process (e.g., ultraviolet light)
that kills microorganisms such as viruses, bacteria,
and protozoa


Distribution System
A network of pipes leading from a treatment plant
to customers' plumbing systems


Ground  Water
Water that is pumped and treated from an aquifer
Inorganic Contaminants
Mineral-based compounds such as metals, nitrates,
and asbestos; naturally occurring in some water,
but can also enter water through human activities
Maximum Contaminant Level

The highest level of a contaminant that EPA allows
in drinking water (legally enforceable standard)
Maximum Contaminant Level Goal
The level of a contaminant at which there would be
no risk to human health (not a legally enforceable
standard)
Microorganisms
Tiny living organisms that can be seen only under
a microscope; some can cause acute health prob-
lems when consumed in drinking water
Non-Transient Non-Community Water
System

A non-community water system that serves the
same people more than six months of the year, but
not year-round


Organic Contaminants
Carbon-based chemicals, such as solvents and pes-
ticides, which enter water through cropland runoff
or discharge from factories


Pathogen

Disease-causing organism


Public Water System (PWS)
A water system which supplies drinking water to at
least 25 people, at least 60 days each year
www.epa.gov/safewater
                    SOW Hotline: 800-426-4791

-------
Sensitive Subpopulation
People who may be more vulnerable to drinking
water contamination, such as infants, children,
some elderly, and people with severely compro-
mised immune systems
Septic System
Used to treat sanitary waste; can be a significant
threat to water quality due to leaks or runoff
Source Water
Water in its natural state, prior to any treatment for
drinking (i.e., lakes, streams, ground water)
Surface Water
Water that is pumped and treated from sources
open to the atmosphere, such as rivers, lakes, and
reservoirs
Transient Non-Community Water System

A non-community water system that serves the
public but not the same individuals for more than
six months
Violation
Failure to meet any state or federal drinking water
regulation


Vulnerability Assessment
An evaluation of drinking water source quality and
its vulnerability to contamination by pathogens and
toxic chemicals


Watershed
The land area from which water drains into a
stream, river, or reservoir


Well

A bored, drilled or driven  shaft whose depth is
greater than the largest surface dimension, a
dug hole whose depth is greater than the largest
surface dimension, an improved sinkhole, or a sub-
surface fluid  distribution system
www.epa.gov/safewater
                     SOW Hotline: 800-426-4791

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