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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Bryceland 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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015ND40ND
20160.765 ppb440.430 ppb - 1.10 ppb
2017ND40ND
2018ND40ND
20190.160 ppb42ND - 0.320 ppb

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
2014-08-04AD94882ND
2014-08-04AD94882ND
2014-09-191335886ND
2014-09-191335885ND
2014-09-191335886ND
2014-09-191335885ND
2015-09-181428693ND
2015-09-181428692ND
2015-09-181428693ND
2015-09-181428692ND
2016-09-2615279740.430 ppb
2016-09-2615279740.430 ppb
2016-09-2615279731.10 ppb
2016-09-2615279731.10 ppb
2017-09-0135334959009ND
2017-09-0135334959010ND
2017-09-0135334959009ND
2017-09-0135334959010ND
2018-09-2035419509002ND
2018-09-2035419509001ND
2018-09-2035419509001ND
2018-09-2035419509002ND
2019-09-04354955180010.320 ppb
2019-09-0435495518002ND
2019-09-04354955180010.320 ppb
2019-09-0435495518002ND