Know Your Environment. Protect Your Health.

Chloroform

Consolidated Irrig District 19 System 2

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020N/A00N/A
2021ND20ND
2022ND10ND
2023ND150ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-08-22ND
2018-08-22ND
2019-08-12ND
2019-08-12ND
2021-08-304168164ND
2021-08-304168163ND
2022-08-094327005ND
2023-03-284436982ND
2023-03-284436977ND
2023-03-284436980ND
2023-05-174456466ND
2023-05-174456464ND
2023-05-174456465ND
2023-05-174456467ND
2023-08-174508742ND
2023-08-174508744ND
2023-08-174508743ND
2023-08-174508745ND
2023-11-274556897ND
2023-11-274556891ND
2023-11-274556893ND
2023-11-274556895ND