&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-09-002
www.epa.gov/safewater
December 2009 Printed on Recycled Paper
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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,
seewww.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 Hotline: 800-426-4791
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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 enforcement
• Includes provisions specifically designed to
protect underground sources of drinking water
- www.epa.gov/safewater/uic
• Requires disinfection of surface water supplies,
except those with pristine, protected sources
• Establishes a multi-billion-dollar state revolv-
ing loan fund for water system upgrades -
www.epa.gov/safewater/dwsrf
• Requires an assessment of the vulnerability of
all drinking water sources to contamination -
www.epa.gov/safewater/protect
— Drinking Water: Past, Present, and Future
EPA-816-F-00-002
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 (almost 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
Safe Drinking Water 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.hlm.
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
Safe Drinking Water 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 orTreatment
Standards in FY2002
D 0% - 6% of Systems D 6% -11% of Systems D 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/
Safe Drinking Water Hotline: 800-426-4791
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publicoutreacMandscapeposter.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 contami-
nation are found in drinking water, water suppliers
are required to issue "Boil Water Notices." Boiling
water for one minute kills the microorganisms 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
cryptosporidiosis 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.
Safe Drinking Water 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
service lines. The greatest exposure to lead is swal-
lowing lead paint chips or breathing in lead 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 action level of lead
(0.015 milligram per liter)
can result in delays in physi-
cal and mental development,
along with slight deficits
in attention span and learn-
ing abilities. 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: pipes
legally considered to be "lead-free" may contain up
to eight percent lead. These pipes can leach signifi-
cant 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/con-
taminants/chv_contamfs/lead.html.
Lead: Do NOT Boil
Do NOT boil water to attempt
to reduce lead. Boiling 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/safewater/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.
3
www.epa.gov/safewater
1 Factoids: Drinking Water & Ground Water Statistics for
2002, 2003.
2 Community Water Systems Survey 2000, Volume I, 2001.
The Clean Water and Drinking Water Infrastructure Gap
Analysis, EPA 816-R-02-020.
Factoids: Drinking Water and Ground Water Statistics for
2001, EPA816-K-02-004.
Morbidity and Mortality Weekly Report: Surveillance for
Waterborne Disease Outbreaks, United States 1999-2000,
2002.
25 Years of the Safe Drinking Water Act, 1999.
Safe Drinking Water 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
Safe Drinking Water 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
(floe) 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
Safe Drinking Water 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 & Waste-water 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
Safe Drinking Water 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*
(*Gallons per Capita per Day)
Bathing, 20 gpcd
Toilet Flushing, 24 gpcd
Laundry
8.5 gpcd
DrinkingandCooking,2gpcd
Garbage Disposal, 1 gpcd
Dishwasher, 4 gpcd
Car
Washing
2.5 gpcd
Lawn Watering and
Pools, 25 gpcd
Source: Van Der Leeden, F., F. L. Troise, and D. K.Todd.
TheWater Encyclopedia. Lewis Publishers, Inc. Second Edition, 1990.
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.
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.l 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
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.
www.epa.gov/safewater
Safe Drinking Water 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 orWater Dams
in Toilet Reservoir), 18 percent
Low-Flow Aerators on
Faucets (or Replacement
Faucets), 2 percent
Low-Water Use
Dishwasher, 4 percent
Insulation on
HotWater Lines,
4 percent
www.epa.gov/safewater
Safe Drinking Water 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.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
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
Safe Drinking Water Hotline: 800-426-4791
-------
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
Safe Drinking Water Hotline: 800-426-4791
-------
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
I 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.
Safe Drinking Water Hotline: 800-426-4791
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TREATMENT DEVICE
WHAT IT DOES TO WATER
TREATMENT LIMITATIONS
Activated Carbon Filter
(includes mixed media that
remove heavy metals)
y Adsorbs organic contaminants that
cause taste and odor problems.
ySomedesigns remove chlorination
byproducts;
y Some types remove cleaning solvents
and pesticides
Is efficient in removing metals such
as lead and copper
Does not remove nitrate, bacteria or
dissolved minerals
Ion Exchange Unit
(with activated alumina)
Reverse Osmosis Unit
(with carbon)
y Removes minerals, particularly calcium
and magnesium that make water"hard"
y Some designs remove radium and
barium
J Removes fluoride
y Removes nitrates, sodium, other
dissolved inorganics and organic
compounds
y Removes foul tastes, smells or colors
y May also reduce the level of some
pesticides, dioxins and chloroform and
petrochemicals
If water has oxidized iron or iron
bacteria, the ion-exchange resin will
become coated or clogged and lose
its softening ability
Does not remove all inorganic and
organic contaminants
Distillation Unit
/ Removes nitrates, bacteria, sodium,
hardness, dissolved solids, most
organic compounds, heavy metals, and
radionucleides
/ Kills bacteria
Does not remove some volatile
organic contaminants, certain pesti-
cides 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 efficient in removing metals such
as lead and copper if they are designed to absorb or
remove lead.
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
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
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
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
Safe Drinking Water 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 Water from
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.
•ir3
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-O WM. html/mtb/decent/homeowner, htm).
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
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 YourTest 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
Safe Drinking Water Hotline: 800-426-4791
-------
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.
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
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.
Safe Drinking Water Hotline: 800-426-4791
-------
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 per 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
S 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 we 11-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.gav/
safewater/publicoutreach. Additional resources are
listed in Appendix C.
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
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National Primary Drinking Water Regulations
Contaminant
^^Q
•tlifl
|^3
•tlifl
•tlifl
•^9
•tlifl
D
D
•tlifl
H9
D
1 Acrylamide
| Alachlor
1 Alpha/photon emitters
1 Antimony
1 Arsenic
| Asbestos (fibers >10
micrometers)
1 Atrazine
1 Barium
1 Benzene
1 Benzo(a)pyrene
(PAHs)
1 Beryllium
1 Beta photon emitters
1 Bromate
1 Cadmium
1 Carbofuran
1 Carbon tetrachloride
Chloramines (as C12)
1 Chlordane
Chlorine (as C12)
Chlorine dioxide
(as C1O2)
| Chlorite
1 Chlorobenzene
1 Chromium (total)
| Copper
1 Cryptosporidium
Disinfectant
| Disinfection Byproduct
MCLor
TT1 (mg/L)2
TT4
0.002
15 picocuries
per Liter
(pCi/L)
0.006
0.010
7 million
fibers per
Liter (MFL)
0.003
2
0.005
0.0002
0.004
4 millirems
per year
0.010
0.005
0.04
0.005
MRDL-4.01
0.002
MRDL-4.01
MRDLO.81
1.0
0.1
0.1
TT5.
Action
Level =
1.3
TT7
Potential health effects from
long-term3 exposure above the MCL
Nervous system or blood problems;
increased risk of cancer
Eye, liver, kidney or spleen problems;
anemia; increased risk of cancer
Increased risk of cancer
Increase in blood cholesterol; decrease
in blood sugar
Skin damage or problems with circulatory
systems, and may have increased
risk of getting cancer
Increased risk of developing benign
intestinal polyps
Cardiovascular system or reproductive
problems
Increase in blood pressure
Anemia; decrease in blood platelets;
increased risk of cancer
Reproductive difficulties; increased risk
of cancer
Intestinal lesions
Increased risk of cancer
Increased risk of cancer
Kidney damage
Problems with blood, nervous system, or
reproductive system
Liver problems; increased risk of cancer
Eye/nose irritation; stomach discomfort;
anemia
Liver or nervous system problems;
increased risk of cancer
Eye/nose irritation; stomach discomfort
Anemia; infants, young children, and fetuses of
pregnant women: nervous system effects
Anemia; infants, young children, and fetuses of
pregnant women: 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
Short-term exposure : Gastrointestinal illness
(e.g., diarrhea, vomiting, cramps)
Common sources of contaminant
in drinking water
Added to water during sewage/
wastewater treatment
Runoff from herbicide
used on row crops
Erosion of natural deposits of certain
minerals that are radioactive and
may emit a form of radiation known
as alpha radiation
Discharge from petroleum refineries;
fire retardants; ceramics; electronics;
solder
Erosion of natural deposits; runoff
from orchards; runoff from glass &
electronics production wastes
Decay of asbestos cement in water
mains; erosion of natural deposits
Runoff from herbicide used on row
crops
Discharge of drilling wastes; discharge
from metal refineries; erosion
of natural deposits
Discharge from factories; leaching
from gas storage tanks and landfills
Leaching from linings of water storage
tanks and distribution lines
Discharge from metal refineries and
coal-burning factories; discharge
from electrical, aerospace, and
defense industries
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
Byproduct of drinking water disinfection
Corrosion of galvanized pipes; erosion
of natural deposits; discharge
from metal refineries; runoff from
waste batteries and paints
Leaching of soil fumigant used on rice
and alfalfa
Discharge from chemical plants and
other industrial activities
Water additive used to control
microbes
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 agricultural
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
Public Health
Goal (mg/L)2
zero
zero
zero
0.006
0
7 MFL
0.003
2
zero
zero
0.004
zero
zero
0.005
0.04
zero
MRDLG-41
zero
MRDLG-41
MRDLGO.81
0.8
0.1
0.1
1.3
zero
^^B Inorganic Chemical ^^^ Organic Chemical
Microorganism ^^1 Radionuclides
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
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pontaminant MC
TTi(n
I Cyanide 0
' (as free cyanide)
. or Potential health effects from Common sources of contaminant
ig/L)2 long-term3 exposure above the MCL in drinking water
Nerve damage or thyroid problems Discharge from steel/metal factories:
^^^H discharge from plastic and fertilizer
^^^H factories
^•22^1 2,4-D 0.07 Kidney, liver, or adrenal gland problems Runoff from herbicide used on row
crops
1 Dalapon 0
| l,2-Dibromo-3- 0.0
chloropropane
(DBCP)
1 o-Dichlorobenzene 0
Minor kidney changes Runoff from herbicide used on rights
^^^H of way
302 Reproductive difficulties; increased risk Runoff/leaching from soil fumigant
^^^H of cancer used on soybeans, cotton, pineapples,
^^^H and orchards
6 Liver, kidney, or circulatory system Discharge from industrial chemical
^^^1 problems factories
1 p-Dichlorobenzene 0.075 Anemia; liver, kidney or spleen damage; Discharge from industrial chemical
changes in blood factories
1 1,2-Dichloroethane 0.005 Increased risk of cancer Discharge from industrial chemical
factories
1 1 , 1 -Dichloroethylene 0.007 Liver problems Discharge from industrial chemical
factories
1 cis-l,2-Dichloroethylene 0.
ltrans-1,2- 0
Dichloroethylene
1 Dichlorom ethane O.C
37 Liver problems Discharge from industrial chemical
factories
1 Liver problems Discharge from industrial chemical
factories
05 Liver problems; increased risk of cancer Discharge from drug and chemical
^^^H factories
^MM^H 1,2-Dichloropropane 0.005 Increased risk of cancer Discharge from industrial chemical
factories
1 Di(2-ethylhexyl) adipate 0.4 Weight loss, liver problems, or possible Discharge from chemical factories
reproductive difficulties
1 Di(2-ethylhexyl) O.C
phthalate
1 Dmoseb O.C
06 Reproductive difficulties; liver problems; Discharge from rubber and chemical
^^^H increased risk of cancer factories
07 Reproductive difficulties Runoff from herbicide used on soybeans
^^^1 and vegetables
1 Dioxin (2,3,7,8-TCDD) 0.00000003 Reproductive difficulties; increased risk Emissions from waste incineration
of cancer and other combustion; discharge
from chemical factories
1 Diquat 0.02 Cataracts Runoff from herbicide use
^KSU^I Endothall 0.1 Stomach and intestinal problems Runoff from herbicide use
^Kffi^l Endrin 0.002 Liver problems Residue of banned insecticide
EL
| Epichlorohydrin T
^4 Increased cancer risk; stomach problems Discharge from industrial chemical
^^^H factories; an impurity of some water
^^^H treatment chemicals
^•22^1 Ethylbenzene 0.7 Liver or kidney problems Discharge from petroleum refineries
H Ethylene dibromide 0.00005 Problems with liver, stomach, reproductive Discharge from petroleum refineries
system, or kidneys; increased risk of cancer
1 Fecal coliform and MC
E. coli
'L6 Fecal coliforms andE. coli are bacteria whose Human and animal fecal waste
^^^H presence indicates that the water may be contaminated
^^^H with human or animal wastes. Microbes in these wastes
^^^H may cause short term effects, such as diarrhea, cramps,
^^^H nausea, headaches, or other symptoms. They may pose a
^^^H special health risk for infants, young children, and people
^^^H with severely compromised immune systems.
1 Fluoride 4.0 Bone disease (pain and tenderness of Water additive which promotes
the bones); children may get mottled strong teeth; erosion of natural
teeth deposits; discharge from fertilizer
and aluminum factories
H Giarcha lamblia TT7 Short-term exposure: Gastrointestinal illness Human and animal fecal waste
(e.g., diarrhea, vomiting, cramps)
••III
1 Glyphosate 0
7 Kidney problems; reproductive Runoff from herbicide use
^^^1 difficulties
Public Health
Goal (mg/L)2
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
zero
0.02
0.1
0.002
zero
0.7
zero
zero6
4.0
zero
0.7
1 Haloacetic acids 0.060 Increased risk of cancer Byproduct of drinking water n/a9
(HAA5) disinfection
1 Heptachlor 0.0004 Liver damage; increased risk of cancer Residue of banned termiticide
1 Heptachlor epoxide 0.0002 Liver damage; increased risk of cancer Breakdown of heptachlor
Heterotrophic plate TT7 HPC has no health effects; it is an HPC measures a range of bacteria
count (HPC) analytic method used to measure the that are naturally present in the
variety of bacteria that are common in environment
water. The lower the concentration of
bacteria in drinking water, the better
maintained the water system is.
D
Disinfectant
| Disinfection Byproduct
^^9 Inorganic Chemical ^^^ Organic Chemical
Microorganism ^^B Radionuclides
zero
zero
n/a
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
Contaminant
•^Q
^•T^l
•tllfl
^^Q
^^Q
•tllfl
^^^9
^^Q
•*lifl
D
1 Hexachlorobenzene
1 Hexachlorocyclopentadiene
JLead
1 Legionella
1 Lindane
1 Mercury (inorganic)
1 Methoxychlor
1 Nitrate (measured as
Nitrogen)
1 Nitrite (measured as
Nitrogen)
1 Oxamyl (Vydate)
1 Pentachlorophenol
1 Picloram
1 Polychlorinated biphenyls
(PCBs)
1 Radium 226 and
Radium 228 (combined)
1 Selenium
1 Simazine
| Styrene
1 Tetrachloroethylene
1 Thallium
1 Toluene
1 Total Coliforms
1 Total Trihalomethanes
• (TTHMs)
1 Toxaphene
| 2,4,5-TP (Silvex)
1 1,2,4-Trichlorobenzene
1 1 , 1 , 1 -Trichloroethane
1 1,1,2-Trichloroethane
1 Trichloroethylene
Disinfectant
| Disinfection Byproduct
MCLor
TT1 (mg/L)2
0.001
0.05
TT5;
Action
Level=0.015
TT7
0.0002
0.002
0.04
10
1
0.2
0.001
0.5
0.0005
5pCi/L
0.05
0.004
0.1
0.005
0.002
1
5.0
percent8
0.080
0.003
0.05
0.07
0.2
0.005
0.005
^E
Potential health effects from
long-term3 exposure above the MCL
Liver or kidney problems; reproductive
difficulties; increased risk of cancer
Kidney or stomach problems
Infants and children: Delays in physical or
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
Infants below the age of six months who
drink water containing nitrate in excess
of the MCL could become seriously ill
and, if untreated, may die. Symptoms
include shortness of breath and blue-baby
syndrome.
Infants below the age of six months who
drink water containing nitrite in excess
of the MCL could become seriously ill
and, if untreated, may die. Symptoms
include shortness of breath and blue-baby
syndrome.
Slight nervous system effects
Liver or kidney problems; increased
cancer risk
Liver problems
Skin changes; thymus gland problems:
immune deficiencies; reproductive or
nervous system difficulties; increased
risk of cancer
Increased risk of cancer
Hair or fingernail loss; numbness in fingers
or toes; circulatory problems
Problems with blood
Liver, kidney, or circulatory system problems
Liver problems; increased risk of cancer
Hair loss; changes in blood; kidney, intestine,
or liver problems
Nervous system, kidney, or liver problems
Common sources of contaminant
in drinking water
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; discharge
from refineries and factories;
runoff from landfills and croplands
Runoff/leaching from insecticide used
on fruits, vegetables, alfalfa, livestock
Runoff from fertilizer use; leaching
from septic tanks, sewage; erosion of
natural deposits
Runoff from fertilizer use; leaching
from septic tanks, sewage; erosion of
natural deposits
Runoff/leaching from insecticide used
on apples, potatoes, and tomatoes
Discharge from wood-preserving
factories
Herbicide runoff
Runoff from landfills; discharge of
waste chemicals
Erosion of natural deposits
Discharge from petroleum and metal refineries:
erosion of natural deposits; discharge
from mines
Herbicide runoff
Discharge from rubber and plastic
factories; leaching from landfills
Discharge from factories and dry cleaners
Leaching from ore-processing sites:
discharge from electronics, glass,
and drug factories
Discharge from petroleum factories
Coliforms are bacteria that indicate that other, Naturally present in the environment
potentially harmful bacteria may be present.
See fecal coliforms andE. coll
Liver, kidney or central nervous system problems; Byproduct of drinking water disinfection
increased risk of cancer
Kidney, liver, or thyroid problems:
increased risk of cancer
Liver problems
Changes in adrenal glands
Liver, nervous system, or circulatory
problems
Liver, kidney, or immune system
problems
Liver problems; increased risk of cancer
Inorganic Chemical
Microorganism ^^B
Runoff/leaching from insecticide used
on cotton and cattle
Residue of banned herbicide
Discharge from textile finishing
factories
Discharge from metal degreasing
sites and other factories
Discharge from industrial chemical
factories
Discharge from metal degreasing
sites and other factories
Organic Chemical
Radionuclides
Public Health
Goal (mg/L)2
zero
0.05
zero
zero
0.0002
0.002
0.04
10
1
0.2
zero
0.5
zero
zero
0.05
0.004
0.1
zero
0.0005
1
zero
n/a9
zero
0.05
0.07
0.2
0.003
zero
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
ontaminant
MCLor
TT1 (mg/L)2
urbidity
TT7
Potential health effects from
long-term3 exposure above the MCL
Common sources of contaminant Public Health
in drinking water Goal (mg/L)2
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 short term symptoms such as
nausea, cramps, diarrhea, and associated headaches.
Soil runoff
n/a
H Uranium
1 Vinyl chloride
Viruses (enteric)
^^^| Xylenes (total)
30ug/L
0.002
TT7
10
Increased risk of cancer, kidney toxicity
Increased risk of cancer
Short-term exposure: Gastrointestinal illness
(e.g., diarrhea, vomiting, cramps)
Nervous system damage
Erosion of natural deposits
Leaching from PVC pipes; discharge
from plastic factories
Human and animal fecal waste
Discharge from petroleum factories;
zero
zero
zero
10
discharge from chemical factories
Disinfectant
Disinfection Byproduct
Inorganic Chemical
Microorganism
| Organic Chemical
Radionuclides
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
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 drinking 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 disinfectant 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 (mg/L) unless otherwise noted. Milligrams per liter are equivalent
to parts per million (ppm).
3 Health effects are from long-term exposure unless specified as short-term exposure.
4 Each water system must certify annually, in writing, to the state (using third-party or manufacturers
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).
5 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 mg/L.
6 A routine sample that is fecal coliform-positive or E. compositive triggers repeat samples-if any
repeat sample is total coliform-positive, the system has an acute MCL violation. A routine sample
that is total coliform-positive and fecal coIiform-negative or E. co//-negative triggers repeat samples-if
any repeat sample is fecal coliform-positive or E. co//-positive, the system has an acute MCL violation.
See also Total Coliforms.
7 EPAs 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) filter their water or meet
criteria for avoiding filtration so that the following contaminants are controlled at the following levels:
• Cryptosporidium'. 99 percent removal for systems that filter. Unfiltered systems are required to
include Cryptosporidium in their existing watershed control provisions.
• Giardia lamblia: 99.9 percent removal/in activation
• Viruses: 99.99 percent removal/inactivation
• Legionella'. No limit, but EPA believes that if Giardia and viruses are removed/inactivated according
to the treatment techniques in the surface water treatment rule, Legionella will also be controlled.
• Turbidity: For systems that use conventional or direct filtration, at no time can turbidity (cloudiness of
water) go higher than 1 nephelolometric turbidity unit (NTU), and samples for turbidity must be
less than or equal to 0.3 NTU in at least 95 percent of the samples in any month. Systems that use
filtration other than conventional or direct filtration must follow state limits, which must include turbidity
at no time exceeding 5 NTU.
• HPC: No more than 500 bacterial colonies per milliliter
• Long Term 1 Enhanced Surface V\foter Treatment; Surface water systems or ground water systems
under the direct influence of surface water serving fewer than 10,000 people must comply with the
applicable Long Term 1 Enhanced Surface Vteter Treatment Rule provisions (e.g. turbidity standards,
individual filter monitoring, Cryptosporidium removal requirements, updated watershed control
requirements for unfiltered systems).
• Long Term 2 Enhanced Surface V\foter Treatment; This rule applies to all surface water systems
or ground water systems under the direct influence of surface water. The rule targets additional
Cryptosporidium treatment requirements for higher risk systems and includes provisions to reduce
risks from uncovered finished water storages facilities and to ensure that the systems maintain microbial
protection as they take steps to reduce the formation of disinfection byproducts. (Monitoring
start dates are staggered by system size. The largest systems (serving at least 100,000
people) will begin monitoring in October 2006 and the smallest systems (serving fewer than
10,000 people) will not begin monitoring until October 2008. After completing monitoring and
determining their treatment bin, systems generally have three years to comply with any additional
treatment requirements.)
• 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.
8 No more than 5.0 percent samples total coliform-positive in a month. (For water systems 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. co//. If two consecutive TC-positive samples, and one is also positive for E. coli or fecal coliforms,
system has an acute MCL violation.
9 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)
• Trihalomethanes: bromodichloromethane (zero); bromoform (zero); dibromochloromethane (0.06 mg/L)
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
Appendix B: References
US EPA Publications
25 Years of the Safe Drinking Water
Act: History & Trends
EPA816-R-99-007
Community Water Systems Survey
2000, Volume I
EPA815-R-02-0054
Drinking Water Costs and Federal
Funding
EPA810-F-99-014
Drinking Water from Household Wells
EPA816-K-02-003
Drinking Water Priority Rulemaking:
Microbial and Disinfection Byproduct
Rules
EPA816-F-01-012
Drinking Water Treatment
EPA810-F-99-013
Factoids: Drinking Water
and Ground Water Statistics for 2001
EPA815-K-02-004
Factoids: Drinking Water and Ground
Water Statistics for 2002
EPA816-K-03-001
Fact Sheet: 1999 Drinking Water
Infrastructure Needs Survey
EPA816-F-01-001
"Investing in America's Water
Infrastructure" Keynote Address by
G. Tracy Mehan III to the Schwab
Capital Markets' Global Water
Conference
Protect Your Drinking Water
EPA816-F-02-012
Public Access to Information & Public
Involvement
EPA810-F-99-021
Report to Congress: EPA Studies
on Sensitive Subpopulations and
Drinking Water Contaminants
EPA815-R-00-015
Safe Drinking Water Act-Protecting
America's Public Health
EPA816-H-02-003
Safe Drinking Water Act:
Underground Injection Control
Program: Protecting Public Health
and Drinking Water Resources
EPA816-H-01-003
The Clean Water and Drinking Water
Infrastructure Gap Analysis
EPA816-F-02-017
The Drinking Water State Revolving
Fund: Protecting the Public Through
Drinking Water Infrastructure
Improvements
EPA819-F-00-028
Understanding the Safe Drinking
Water Act
EPA810-F-99-008
Using Water Wisely in the Home
EPA 800-F-02-001
Featured Consumer
Information Resources
Download the following documents
from EPA's New Drinking Water
Consumer Information Web site:
http://www.epa.gov/safewater/con-
sumerinformation/
Or order hard copies from EPA's
National Service Center for
Environmental Publications:
HYPERLINK "http://www.epa.gov/
nscep" http://www.epa.gov/nscep or
1-800-490-9198
Public Health and Emergency
Information:
Bottled Water Basics, 816-K-05-003
Filtration Facts, 816-K-05-002
Emergency Disinfection of
Drinking Water
English, 816-F-06-027
Spanish, EPA816-F-06-028
French, 816-F-06-045
Arabic, 816-F-06-030
Vietnamese, 816-F-06-029
What to Do After the Flood
English, 816-F-05-021
Spanish, 816-F-05-021
Vietnamese, 816-F-05-025
Is There Lead In My Drinking Water?
816-F-05-001
Guidance for People with Severely
Weakened Immune Systems,
816-F-99-005
Public Involvement in Water Security
Web site, a compilation of resources
to help increase public awareness
of water security issues and to give
citizens information and guidance
to help them prepare for potential
emergency incidents and incorporate
security activities into their daily lives,
http://cfpub.epa.gov/safewater/water-
security/publiclnvolve.cfm
Environmental Education:
Thirstin's Drinking Water Games and
Activities (CD-ROM), 816-C-04-008
Virtual Tour of a Water Treatment
Plant (CD-ROM), 816-C-06-002
Find answers to your questions about
drinking water and ground water
programs authorized under the Safe
Drinking Water Act in EPA's dynamic
question and answer database,
http://www.epa.gov/safewater/drin-
klink.html.
Publications From
Outside Sources
Centers for Disease Control and
Prevention. Morbidity and Mortality
Weekly Report: Surveillance for
Waterborne-Disease Outbreaks-
United States-1999-2000.
Congressional Budget Office. Future
Investment in Drinking Water &
Wastewater Infrastructure
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
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
16201 Street NW
Suite 500
Washington, DC 20006
Phone (202) 331-2820
Fax (202) 785-1845
www.a/nwa.nef
Association of State Drinking Water
Administrators
1401 Wilson Blvd.
Suite 1225
Arlington, VA 22209
Phone (703) 812-9505
www.ascfwa.org
Clean Water Action
4455 Connecticut Avenue NW Suite A300
Washington, DC 20008
Phone (202) 895-0420
www. clean water, org
Consumer Federation of America
1620 I Street NW
Suite 200
Washington, DC 20006
Phone (202) 387-6121
www. consume/fed, 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
Oklahoma City, OK 73142
Phone (405) 516-4972
www.awpc.org
International Bottled Water Association
1700 Diagonal Road
Suite 650
Alexandria, VA 22314
Phone (703)683-5213
Information Hotline 1-800-WATER-11
ibwainfofftbottleclwater. org
National Association of Regulatory Utility
Commissioners
1101 Vermont Ave NW
Suite 200
Washington, DC 20005
Phone (202) 898-2200
www.naruc.org
National Association of Water Companies
2001 L Street NW
Suite 850
Washington, DC 20036
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. ncfwc. wvu. edu
National Ground Water Association
601 Dempsey Rd
Westerville, OH 43081-8978
Phone: (800) 551-7379
www.ngwa.org
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.nrcfc.org
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
NSF International
P.O. Box 130140
789 North Dixboro Road
Ann Arbor, Ml 48113
Phone (800) NSF-MARK
www.nsf.org
Rural Community Assistance Program
1522 K Street NW
Suite 400
Washington, DC 20005
Phone (800) 321-7227
www.fcap.org
Underwriters Laboratories
Corporate Headquarters
2600 N.W. Lake Road
Camas, WA 98607
Phone (877) 854-3577
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-4100T
Washington, DC 20460
SDWA Hotline (800) 426-4791
www. epa. go v/safe water
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. watersystems council.org
EPA Region 1
(CT, ME, MA, NH, Rl, VT)
Phone (888) 372-7341
Phone (617) 918-1614
EPA Region 2
(NJ, NY, PR, VI)
Phone (212)637-3000
EPA Region 3
(DE, DC, MD, PA, VA, WV)
Phone (215)814-5000
EPA Region 4
(AL, FL, GA, KY, MS, NC, SC, TN)
Phone (404) 562-9900
EPA Region 5
(IL, IN, Ml, MN, OH, Wl)
Phone (312)353-2000
EPA Region 6
(AR, LA, NM, OK, TX)
Phone (214)665-2200
EPA Region 7
(IA, KS, MO, NE)
Phone (913) 551-7003
EPA Region 8
(CO, MT, ND, SD, UT, WY)
Phone (303)312-6312
EPA Region 9
(AZ, CA, HI, NW, AS GU)
Phone (415)947-8000
EPA Region 10
(AK, ID, OR, WA)
Phone (206) 553-1200
www.epa.gov/safewater
Safe Drinking Water Hotline: 800-426-4791
-------
Appendix D: Glossary
Action Level
The level of lead and copper which, if exceeded,
triggers treatment or other requirements that a
water system must follow.
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
www.epa.gov/safewater
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
Safe Drinking Water Hotline: 800-426-4791
-------
Public Water System (PWS)
A water system which supplies drinking water to at
least 25 people, at least 60 days each year
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
Safe Drinking Water Hotline: 800-426-4791
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