&EPA
United States
Environmental Protection
Agency
Home Water Testing
Should I Have My Water Tested?
The answer to this question depends on several factors. It
concerns your health and the health of your family, so you
need to know some basic facts.
In addition to illness, a variety
of less serious problems
such as taste, color, odor and
staining of clothes or fixtures
are signs of possible water
quality problems. Other
things to think about include
the nearness of your water
well to septic systems and the
composition of your home's
plumbing materials.
This fact sheet provides
information to help you decide whether or not to have your
water tested, and if so, suggested tests for your situation.
Do you suspect lead maybe in some of your
household plumbing materials and water service
lines?
OST water systems test Tor lead as a regular part or
water monitoring. These tests give a system-wide
picture, but do not reflect conditions at a specific
household faucet.
If you want to know if your home's drinking water
contains unsafe levels of lead, have your water tested.
Testing is the only way to confirm if lead is present or
absent.
Some faucet and pitcher filters can remove lead from
drinking water. If you use a filter to remove lead, be
sure you get one that is certified to remove lead by NSF
International.
For more information, visit www.epa.gov/safewater/
lead, or call the Safe Drinking Water Hotline at
1-800-426-4791.
Are you considering a home water treatment unit?
remove before contacting potential dealers. Be informed
so you can make the right decisions. To help you, please
visit: www.epa.gov/safewater/faq/faq.htmltfhwtu and
www.epa.gov/safewater/wot.
Public Water Systems
When you turn on the tap, where does the water come
from? If you pay a water bill, you are purchasing water
from a public water system, where your water is monitored,
tested and the results reported to the
federal, state or tribal drinking water
agencies responsible for making sure it
meets the National Primary Drinking
Water Standards. Your water company
must notify you when contaminants
are in the water they provide that may
cause illness or other problems.
Most people in the United States
receive water from a community water
system that provides its customers with
an annual water quality report, also known as a Consumer
Confidence Report. Normally, you will receive it with
your water bill once a year in July. The report contains
information on contaminants found, possible health effects,
and the water's source. If you do not receive a report,
contact your water company for this information.
Private Water Supplies
If your drinking water does not come from a public water
system, or you get your drinking water from a household
well, you alone
are responsible
for assuring
that it is safe.
For this reason,
routine testing
for a few of the
most common
contaminants
is highly recommended. Even if you currently have a safe,
pure water supply, regular testing can be valuable because
it establishes a record of water quality. This record is
helpful in solving any future problems and in obtaining
compensation if someone damages your water supply.
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The following items will help you determine when to test
your private drinking water supply.
How frequently should I test?
Test water every year for total coliform bacteria,
nitrates, total dissolved solids and pH levels,
especially if you have a new well, or have replaced
or repaired pipes, pumps or the well casing.
Do you expect to have a new baby in the
household?
Test for nitrate in the early months of a pregnancy,
before bringing an infant home, and again during
the first six months of the baby's life. It is best
to test for nitrate during the spring or summer
following a rainy period.
Do you have taste, odor and staining issues?
Test for sulfate, chloride, iron, manganese,
hardness and corrosion, and every three years. If
you suspect other contaminants, test for these also.
Have you had a chemical or fuel spill or leak
near your water supply?
Test your well for chemical contaminants, such
as volatile organic compounds. Tests can be
expensive; limit them to possible problems specific
to your situation. Local
experts can tell you about
possible impurities in your
area.
Is someone in your
household pregnant
or nursing an infant?
Are there unexplained
illnesses in your family?
Do you notice a change in
water taste, odor, color or
clarity? You may need to
test more than once a year.
Do you know who can test your water?
Often county health departments will help you
test for bacteria or nitrates. If not, you can have
your water tested by a state certified laboratory.
You can find one in your area by calling the
Safe Drinking Water Hotline at 800-426-4791 or
visiting www.epa.gov/safewater/labs.
Collecting Samples
Most testing laboratories or services supply their own
sample containers. Use the containers provided and
carefully follow the instructions given for collecting,
preserving and handling water samples. Samples for
coliform bacteria testing must be collected using sterile
containers and under sterile conditions. Some procedures
require that water runs from an outside tap for several
minutes before filling the sample containers. Laboratories
may sometimes send a trained technician to collect the
sample or to analyze the sample directly in your home.
Ask if this service is available, since you may obtain better
samples and more reliable test results.
WH EN TO TEST YOU R WATER
Conditions or nearby activities
Recommended Test
Recurrent gastro-intestinal illness
Coliform bacteria
Household plumbing
contains lead
pH, lead, copper
Radon in indoor air or region is
radon rich 1
Radon
Scaly residues, soaps don't lather
Hardness
Water softener needed to treat
hardness
Manganese, iron
Stained plumbing fixtures,
laundry 1
iron, copper, manganese
Objectionable taste or smell
Hydrogen sulfide,
corrosion, metals
Water appears cloudy, frothy or
colored 1
Color, detergents
Corrosion of pipes, plumbing
1 Corrosion, pH, lead
Rapid wearof water treatment
equipment 1
pH, corrosion
Nearby areas of intensive
agriculture
Nitrate, pesticides, coliform
bacteria
Coal or other mining operation
nearby
Metals, pH, corrosion
Gas drilling operation nearby
Chloride, sodium, barium,
strontium
Odor of gasoline or fuel oil, and
near gas station or buried fuel
tanks |
Volatile organic
compounds (VOC)
Dump, junkyard, landfill, factory
or dry-cleaning operation nearby
VOC, Total disolved solids
(IDS), pH, sulfate, chloride,
metals
Salty taste and seawater, or a
heavily salted roadway nearby
Chloride,TDS, sodium
Office of Water (4606)
www. e pa .g o v/safewate r
EPA 816-F-05-013 May 2005
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