Know Your Environment. Protect Your Health.

Chloroform

Gurdon Waterworks

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND70ND
2020ND40ND
2021ND30ND
2022ND40ND
2023ND10ND

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
2018-01-2218025000709ND
2018-04-2418115005302ND
2019-01-2319024002009ND
2019-01-2319024002101ND
2019-04-3019122001602ND
2019-04-3019122001708ND
2019-08-0619220001809ND
2019-09-0319248000101ND
2019-11-1819324000209ND
2020-02-0420037002201ND
2020-02-0420037002101ND
2020-02-0420037002001ND
2020-06-1020163013501ND
2021-02-0921041002401ND
2021-02-0921041002108ND
2021-05-1021133005602ND
2022-01-1022013000101ND
2022-01-1122013002609ND
2022-05-09O198104-THM-1ND
2022-10-03O202442-VOC-1ND
2023-05-08O208941-THM-1ND