Know Your Environment. Protect Your Health.

Chloroform

Windsong 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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND20ND
2020ND10ND
2021ND10ND
202274.0 ppb41ND - 296.0 ppb
2023ND50ND

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
2018-03-22AE19647ND
2019-07-17AE74828ND
2019-11-18AE89579ND
2020-12-17AF38046ND
2021-10-26AF74720ND
2022-07-07AG03647ND
2022-07-07AG03676ND
2022-07-07AG03678296.0 ppb
2022-12-21Q2300008001ND
2023-02-23AG30286ND
2023-02-23AG30288ND
2023-04-26AG38217ND
2023-07-24AG49828ND
2023-12-22AG67348ND