Know Your Environment. Protect Your Health.

Chloroform

Ivanhoe Land of Lakes

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20186.45 ppb65ND - 27.0 ppb
20190.800 ppb62ND - 3.50 ppb
2020ND40ND
20211.10 ppb21ND - 2.20 ppb
2022ND20ND
2023ND30ND

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
2018-02-20AE144756.70 ppb
2018-06-04AE28518ND
2018-06-04AE285532.10 ppb
2018-06-21AE309951.20 ppb
2018-09-25AE4152627.0 ppb
2018-12-03AE476141.70 ppb
2019-03-05AE571321.30 ppb
2019-03-05AE57136ND
2019-03-05AE57138ND
2019-05-22AE67666ND
2019-05-22AE677053.50 ppb
2019-08-14AE78672ND
2020-02-20AE99301ND
2020-06-02AF13863ND
2020-06-29AF17290ND
2020-06-29AF17292ND
2021-08-18AF66881ND
2021-08-18AF668962.20 ppb
2022-08-16AG09441ND
2022-10-20AG17828ND
2023-07-31AG50590ND
2023-07-31AG50606ND
2023-07-31AG50612ND