Know Your Environment. Protect Your Health.

Chloroform

Shangri La Subdivision

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND40ND
20200.620 ppb31ND - 1.86 ppb
20210.397 ppb31ND - 1.19 ppb
20220.433 ppb41ND - 1.73 ppb
2023ND30ND

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
2018-11-12Q1845459020ND
2018-11-12Q1845459022ND
2018-11-12Q1845459008ND
2019-06-19Q1937663005ND
2019-06-19Q1937663007ND
2019-06-19Q1937663009ND
2019-06-19Q1937663015ND
2020-06-25Q2025622001ND
2020-06-25Q20256220031.86 ppb
2020-06-25Q2025622005ND
2021-06-16Q2115844002ND
2021-06-16Q2115844006ND
2021-06-16Q21158440041.19 ppb
2022-03-22Q2209179008ND
2022-03-22Q22091790101.73 ppb
2022-03-22Q2209179012ND
2022-06-06Q2215732002ND
2023-02-21Q2307017001ND
2023-12-04Q2351630001ND
2023-12-04Q2351630003ND