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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Wheeler Municipal Water System

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND30ND
2016ND50ND
2017ND30ND
2018ND30ND
2019ND30ND

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
2014-05-13Q1416449004ND
2014-05-13Q1416449003ND
2015-06-02Q1520520005ND
2015-06-02Q1520520004ND
2015-06-02Q1520520002ND
2016-05-24Q1620869004ND
2016-05-24Q1620869003ND
2016-05-24Q1620869002ND
2016-09-19Q1639762002ND
2016-11-08Q1648022003ND
2017-01-30Q1703941003ND
2017-08-09Q1733949003ND
2017-08-09Q1733949002ND
2018-02-08Q1805286005ND
2018-05-08Q1819040002ND
2018-05-08Q1819040001ND
2019-02-13Q1906863001ND
2019-08-06Q1951382002ND
2019-08-06Q1951382003ND