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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Boone County PWSD 9

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.178 ppb51ND - 0.890 ppb
2013ND10ND
2014ND20ND
2015ND70ND
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
2012-02-07AB66759ND
2012-02-07AB66761ND
2012-02-08AB66758ND
2012-02-08AB66760ND
2012-06-26AB751680.890 ppb
2013-06-13AC01320ND
2014-06-24AC28755ND
2014-06-24AC28756ND
2015-02-18AC42744ND
2015-02-18AC42742ND
2015-02-18AC42743ND
2015-02-18AC42741ND
2015-02-18AC42745ND
2015-06-29AC51315ND
2015-06-29AC51316ND
2016-06-27AC74961ND
2016-06-27AC74962ND
2017-06-29AC98563ND
2017-06-29AC98562ND