Know Your Environment. Protect Your Health.

Chloroform

Seven Estates

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020ND40ND
2021ND30ND
20223.10 ppb41ND - 12.4 ppb
2023ND40ND

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
2020-03-05Q2008336001ND
2020-03-05Q2008336003ND
2020-06-17Q2024632006ND
2020-08-27Q2034428005ND
2021-05-13Q2112487005ND
2021-09-13Q2124817001ND
2021-09-13Q2124817003ND
2022-04-27Q2212699005ND
2022-04-27Q221269900712.4 ppb
2022-09-06Q2226323001ND
2022-10-19Q2231793003ND
2023-05-04Q2317011001ND
2023-05-04Q2317011003ND
2023-05-04Q2317011005ND
2023-05-04Q2317011014ND