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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Woods Cross City 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.

MORE ABOUT THIS CONTAMINANT

 

107

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND260ND
2015ND160ND
2016ND170ND
2017ND160ND
2018ND160ND
2019ND160ND

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 Result
2014-01-28ND
2014-01-28ND
2014-01-28ND
2014-01-28ND
2014-01-28ND
2014-01-28ND
2014-03-27ND
2014-03-27ND
2014-04-15ND
2014-04-15ND
2014-04-15ND
2014-04-15ND
2014-04-15ND
2014-04-15ND
2014-06-30ND
2014-06-30ND
2014-07-23ND
2014-07-23ND
2014-07-23ND
2014-07-23ND
2014-07-23ND
2014-07-23ND
2014-09-30ND
2014-09-30ND
2014-12-30ND
2014-12-30ND
2015-03-31ND
2015-03-31ND
2015-06-24ND
2015-06-24ND
2015-09-16ND
2015-09-16ND
2015-09-16ND
2015-09-16ND
2015-09-16ND
2015-09-16ND
2015-09-16ND
2015-09-16ND
2015-12-07ND
2015-12-07ND
2015-12-07ND
2015-12-30ND
2016-03-18ND
2016-03-18ND
2016-03-18ND
2016-06-24ND
2016-06-24ND
2016-06-24ND
2016-06-24ND
2016-08-12ND
2016-08-12ND
2016-08-12ND
2016-08-12ND
2016-09-14ND
2016-09-14ND
2016-12-15ND
2016-12-15ND
2016-12-15ND
2016-12-15ND
2017-03-16ND
2017-03-16ND
2017-03-16ND
2017-03-16ND
2017-06-12ND
2017-06-12ND
2017-06-12ND
2017-06-12ND
2017-08-14ND
2017-08-14ND
2017-08-14ND
2017-08-14ND
2017-11-06ND
2017-11-06ND
2017-11-06ND
2017-11-06ND
2018-02-08ND
2018-02-08ND
2018-02-08ND
2018-02-08ND
2018-05-01ND
2018-05-01ND
2018-05-01ND
2018-05-01ND
2018-08-30ND
2018-08-30ND
2018-08-30ND
2018-08-30ND
2018-11-27ND
2018-11-27ND
2018-11-27ND
2018-11-27ND
2019-02-14ND
2019-02-14ND
2019-02-14ND
2019-02-14ND
2019-06-06ND
2019-06-06ND
2019-06-06ND
2019-06-06ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-11-06ND
2019-11-06ND
2019-11-06ND
2019-11-06ND