Know Your Environment. Protect Your Health.

Chloroform

Crown Mountain WSC

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.300 ppb41ND - 1.20 ppb
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
20231.65 ppb21ND - 3.30 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
2018-02-08AE13069ND
2018-06-19AE304461.20 ppb
2018-06-19AE30473ND
2018-08-02AE35578ND
2019-09-26AE84818ND
2019-09-26AE84856ND
2020-09-14AF27172ND
2020-09-14AF27210ND
2021-08-02AF64220ND
2021-08-02AF64248ND
2022-06-22AG01894ND
2022-06-22AG01956ND
2023-06-15AG447043.30 ppb
2023-06-15AG44727ND