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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Big Bear City CSD

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

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND200ND
2015ND90ND
2016ND80ND
2017ND80ND
2018ND30ND
2019ND20ND

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
2014-01-023761-014-1045ND
2014-01-293761-602-0930ND
2014-01-293761-601-0810ND
2014-04-093761-602-1010ND
2014-04-093761-601-0820ND
2014-06-043761-001-0840ND
2014-06-043761-002-0900ND
2014-06-043761-003-0750ND
2014-06-043761-004-1125ND
2014-06-043761-005-1130ND
2014-06-043761-006-1005ND
2014-06-043761-008-1055ND
2014-06-043761-009-1135ND
2014-06-043761-010-1140ND
2014-06-043761-012-1105ND
2014-06-043761-014-1030ND
2014-06-043761-015-0925ND
2014-06-043761-016-1020ND
2014-07-093761-601-0800ND
2014-07-093761-602-0930ND
2015-01-073761-602-0920ND
2015-01-073761-601-0800ND
2015-04-083761-601-0920ND
2015-04-083761-602-0945ND
2015-07-083761-601-0955ND
2015-07-083761-602-1045ND
2015-08-053761-005-0815ND
2015-10-073761-602-0855ND
2015-10-073761-601-0800ND
2016-01-133761-602-1005ND
2016-01-133761-601-0835ND
2016-04-133761-602-0935ND
2016-04-133761-601-0750ND
2016-07-273761-602-1045ND
2016-07-273761-601-0930ND
2016-10-193761-602-0855ND
2016-10-193761-601-0815ND
2017-05-313761-004-1015ND
2017-05-313761-005-1020ND
2017-05-313761-008-0953ND
2017-05-313761-009-1020ND
2017-05-313761-010-1040ND
2017-05-313761-012-1000ND
2017-07-263761-601-0755ND
2017-07-263761-602-0850ND
2018-06-123761-018-0800ND
2018-07-253761-601-0810ND
2018-07-253761-602-0900ND
2019-07-243761-601-0815ND
2019-07-243761-602-0940ND