Know Your Environment. Protect Your Health.

Chloroform

Encinal Water Supply Corporation

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND70ND
2021ND40ND
2022ND40ND
20230.800 ppb41ND - 3.20 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
2018-07-19AE33965ND
2018-07-19AE33973ND
2018-07-19AE33932ND
2019-09-26AE84814ND
2019-09-26AE84864ND
2019-12-11AE92154ND
2020-03-24AF04315ND
2020-03-24AF04317ND
2020-03-24AF04319ND
2020-06-08AF14804ND
2020-06-08AF14872ND
2020-07-20AF19932ND
2020-12-10AF37297ND
2021-08-04AF64769ND
2021-08-04AF64835ND
2021-08-04AF64837ND
2021-12-22AF79284ND
2022-09-29AG15447ND
2022-09-29AG15510ND
2022-09-29AG15512ND
2022-09-29AG15514ND
2023-09-14AG56251ND
2023-09-14AG56310ND
2023-09-14AG563143.20 ppb
2023-09-14AG56318ND