Know Your Environment. Protect Your Health.

Chloroform

El Dorado Utility District

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND40ND
20220.280 ppb51ND - 1.40 ppb
20230.333 ppb31ND - 1.000 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
2018-05-23AE27472ND
2018-05-23AE27494ND
2018-05-23AE27394ND
2019-09-24AE84381ND
2019-11-07AE88917ND
2019-11-07AE88949ND
2020-09-03AF26451ND
2020-09-03AF26496ND
2020-09-03AF26498ND
2021-07-28AF63797ND
2021-07-28AF63803ND
2021-07-28AF63729ND
2021-11-01AF75259ND
2022-03-25AF90742ND
2022-03-25AF90744ND
2022-05-23AF97935ND
2022-05-23AF98024ND
2022-08-23AG105301.40 ppb
2023-06-29AG46725ND
2023-06-29AG467961.000 ppb
2023-06-29AG46798ND