Know Your Environment. Protect Your Health.

Chloroform

Mandeville Water Supply

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.265 ppb42ND - 0.530 ppb
2019ND40ND
20200.170 ppb31ND - 0.510 ppb
2021ND20ND
2022ND20ND
20230.270 ppb21ND - 0.540 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
2018-02-16353748640010.530 ppb
2018-02-16353748640010.530 ppb
2018-08-1035410510001ND
2018-08-1035410510001ND
2019-02-2135450032001ND
2019-02-2135450032001ND
2019-08-1535490976001ND
2019-08-1535490976001ND
2020-02-14355314440010.510 ppb
2020-08-0735568973001ND
2020-08-0735568973002ND
2021-02-0535610005001ND
2021-08-0235652729001ND
2022-02-1135696582001ND
2022-08-0235736643001ND
2023-02-0335776992001ND
2023-08-11358202980010.540 ppb