Know Your Environment. Protect Your Health.

Chloroform

Bell Water

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.585 ppb21ND - 1.17 ppb
20191.08 ppb53ND - 3.13 ppb
20201.01 ppb53ND - 1.81 ppb
20210.724 ppb53ND - 1.40 ppb
20220.788 ppb52ND - 2.31 ppb
20230.568 ppb52ND - 1.54 ppb

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
2018-09-27Q18386750041.17 ppb
2018-09-27Q1838675001ND
2019-03-14Q19108500011.08 ppb
2019-06-27Q19409780013.13 ppb
2019-09-17Q19666980011.20 ppb
2019-12-18Q1980818003ND
2019-12-18Q1980818009ND
2020-03-25Q2012678001ND
2020-06-15Q2023823001ND
2020-09-09Q20361310011.71 ppb
2020-12-01Q20479990011.54 ppb
2020-12-01Q20479990061.81 ppb
2021-03-10Q21064260031.40 ppb
2021-03-10Q21064260011.18 ppb
2021-06-23Q21164300011.04 ppb
2021-09-09Q2124649001ND
2021-12-17Q2135902001ND
2022-03-02Q22071910012.31 ppb
2022-04-20Q2212072004ND
2022-04-20Q2212072009ND
2022-08-03Q2222229001ND
2022-10-25Q22320880011.63 ppb
2023-01-12Q23019740011.54 ppb
2023-06-12Q2322102001ND
2023-06-12Q2322102006ND
2023-09-07Q23386070011.30 ppb
2023-11-30Q2351073001ND