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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

San Jacinto Special Utility District

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.

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND40ND
2016ND110ND
2017ND40ND
2018ND40ND
2019ND70ND

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
2014-03-26AC48342ND
2014-09-15AC66894ND
2015-09-01AD05166ND
2015-09-01AD05208ND
2015-09-01AD05200ND
2015-09-01AD05202ND
2016-03-14AD28468ND
2016-03-14AD28470ND
2016-03-14AD28474ND
2016-06-28AD42185ND
2016-06-28AD42195ND
2016-06-28AD42187ND
2016-06-28AD42151ND
2016-09-24AD51200ND
2016-09-24AD51180ND
2016-12-13AD61922ND
2016-12-13AD61938ND
2017-07-25AD90572ND
2017-09-14AD96311ND
2017-09-14AD96299ND
2017-09-14AD96309ND
2018-03-12AE17846ND
2018-03-12AE17880ND
2018-03-12AE17838ND
2018-07-06AE32613ND
2019-03-13AE58227ND
2019-03-13AE58225ND
2019-03-13AE58223ND
2019-06-06AE69493ND
2019-06-06AE69452ND
2019-08-01AE76824ND
2019-12-05AE91443ND