Know Your Environment. Protect Your Health.

Chloroform

City of Chico

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
2019ND70ND
2020ND80ND
2021ND70ND
2022ND50ND
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
2018-02-28Q1808235001ND
2018-06-07Q1822702001ND
2018-09-26Q1838500001ND
2018-12-13Q1851676001ND
2018-12-13Q1851676003ND
2018-12-13Q1851676006ND
2018-12-13Q1851676023ND
2019-01-08Q1900653001ND
2019-01-08Q1900653006ND
2019-01-08Q1900653007ND
2019-01-08Q1900653010ND
2019-04-09Q1914098001ND
2019-08-13Q1954152001ND
2019-11-21Q1977808001ND
2020-03-02Q2007727001ND
2020-03-02Q2007727006ND
2020-06-01Q2021442001ND
2020-06-01Q2021442003ND
2020-08-19Q2033209013ND
2020-08-19Q2033209003ND
2020-08-19Q2033209001ND
2020-12-16Q2049866001ND
2021-03-10Q2106372001ND
2021-05-12Q2112418001ND
2021-08-11Q2121372007ND
2021-08-11Q2121372009ND
2021-08-11Q2121372011ND
2021-08-11Q2121372022ND
2021-12-14Q2135210001ND
2022-09-08Q2226813001ND
2022-09-08Q2226813011ND
2022-09-08Q2226813010ND
2022-09-08Q2226813005ND
2022-09-08Q2226813003ND
2023-05-30Q2319948001ND
2023-05-30Q2319948002ND
2023-05-30Q2319948009ND
2023-05-30Q2319948011ND
2023-05-30Q2319948013ND