36. Test Your Water For Pesticides—If Necessary |
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Community water supplies are required to test for 83 contaminants
on a regular basis and must inform customers when a detection exceeds
health standards. They also must issue annual reports on test results.
However, if your water comes from a private well, you may have
good reason to do your own testing for pesticides, especially in
these cases: someone in the immediate area confirms pesticide contamination
in a private well; a commercial pesticide distributor is located
nearby; you have a shallow, large-diameter well; or you are aware
of pesticide mixing, spills, or tanks being emptied within a few
hundred feet of your well.
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Testing
for pesticides is more expensive than testing for nitrate and bacteria,
so you want to have a good idea of what you are looking for. If your
well is particularly vulnerable to contamination, you may need to
test periodically throughout the year to get an accurate picture of
the problem. |
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Sometimes
it is cheapest to have the lab “screen” one water sample
for all of the chemicals you are looking for. Screening is an economical
way to look for many chemicals, but it cannot accurately determine
their concentration. |
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State
environmental agencies or the local and regional offices of the department
of public health will have information on where to have water tested
for pesticides and may even be equipped to do the testing. Once you
have found a certified testing laboratory that will run the tests
you need, find out what the charge is. |
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If
the test is positive for pesticides, you may want to immediately retest
your well. Changes in rainfall, pesticide use, or water withdrawal
can cause wide variations in the levels of pesticides found in your
well. A second test may give you a better overall idea of what is
in your water. |
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If any amount of pesticide is found in your water, seek advice from
your local or state health department on actions to take and whether
you need to do follow-up testing. |
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Once
you know what chemical is in your water, and how much was detected,
obtain a health advisory summary from the public health department
or the U.S. EPA. Health advisory summaries will tell you both the
noncancer health risks and the cancer risk from pesticides and other
chemicals in water. |
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