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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Tract 349 Mutual Water Co.

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.

 

44

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND60ND
2014ND70ND
2015ND80ND
2016ND70ND
2017ND100ND

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
2012-01-122706-002-0820ND
2012-01-232706-002-1230ND
2012-04-242706-002-0900ND
2012-07-122706-002-0835ND
2012-10-222706-003-1055ND
2012-10-222706-002-1040ND
2013-01-212706-002-1140ND
2013-04-162706-002-0820ND
2013-09-272706-002-0825ND
2013-10-102706-002-0914ND
2013-10-242706-003-0930ND
2013-10-242706-002-0900ND
2014-02-069588-002-0916ND
2014-04-169588-002-1015ND
2014-07-319588-002-0915ND
2014-08-133761-800-0835ND
2014-08-133761-801-0815ND
2014-12-099588-003-0914ND
2014-12-129588-002-0938ND
2015-03-209588-002-0930ND
2015-04-249588-002-0940ND
2015-07-309588-002-1133ND
2015-08-053761-801-0818ND
2015-08-053761-800-0818ND
2015-09-259588-002-0905ND
2015-10-239588-002-0932ND
2015-10-269588-003-0929ND
2016-01-299588-003-0900ND
2016-03-299588-002-0926ND
2016-05-279588-002-0915ND
2016-07-229588-002-0939ND
2016-09-073761-800-0959ND
2016-09-073761-801-1001ND
2016-10-149588-002-0930ND
2017-01-279588-002-0920ND
2017-02-109588-002-0850ND
2017-02-249588-003-0910ND
2017-03-109588-002-0925ND
2017-04-219588-002-0907ND
2017-07-149588-002-0915ND
2017-08-023761-801-1024ND
2017-08-023761-800-1059ND
2017-10-279588-002-0950ND
2017-11-179588-002-1115ND