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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

PUD #1 of Asotin County

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

 

35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND90ND
2013ND20ND
20140.0217 ppb121ND - 0.260 ppb
2015ND80ND
2016ND20ND
2017ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2012-08-2174929ND
2012-08-2174919ND
2012-08-2174921ND
2012-08-2174917ND
2012-08-2174927ND
2012-08-2174925ND
2012-08-2174923ND
2012-08-2174931ND
2012-08-2274945ND
2013-08-2888164ND
2013-08-2888162ND
2014-06-0598387ND
2014-06-0598389ND
2014-06-0598385ND
2014-06-0598391ND
2014-07-2400853ND
2014-07-2400847ND
2014-07-2400851ND
2014-07-24008490.260 ppb
2014-10-0753554ND
2014-10-0753552ND
2014-10-0753556ND
2014-10-0753550ND
2015-03-3058633ND
2015-03-3058635ND
2015-03-3058637ND
2015-03-3058639ND
2015-05-2160403ND
2015-05-2160405ND
2015-05-2160407ND
2015-05-2160409ND
2016-03-17ND
2016-03-17ND
2017-04-19ND
2017-04-19ND