Know Your Environment. Protect Your Health.

Chloroform

Madera Valley Water Supply Corporation

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND50ND
2021ND40ND
2022ND40ND
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
2018-07-18Q1828958010ND
2018-07-18Q1828958012ND
2018-07-18Q1828958014ND
2018-07-18Q1828958002ND
2019-06-20Q1938291004ND
2019-06-20Q1938291006ND
2019-06-20Q1938291008ND
2019-06-20Q1938291014ND
2020-08-17Q2033215001ND
2020-08-17Q2033215003ND
2020-08-17Q2033215005ND
2020-08-17Q2033215014ND
2020-12-02Q2048267001ND
2021-03-15Q2106895001ND
2021-03-15Q2106895003ND
2021-09-13Q2125100003ND
2021-09-13Q2125100010ND
2022-02-07Q2204392003ND
2022-02-07Q2204392005ND
2022-08-31Q2225814003ND
2022-08-31Q2225814006ND
2023-04-20Q2314887001ND
2023-04-20Q2314887003ND
2023-08-30Q2337553001ND
2023-08-30Q2337553006ND