Know Your Environment. Protect Your Health.

Chloroform

Wisconsin Dells Waterworks

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
20180.440 ppb110.440 ppb
2019ND10ND
20200.121 ppb73ND - 0.360 ppb
20210.460 ppb110.460 ppb
20220.520 ppb110.520 ppb
20230.200 ppb61ND - 1.20 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
2018-09-201798020.440 ppb
2019-09-19329347ND
2020-09-10471856ND
2020-09-114721660.360 ppb
2020-09-114721710.230 ppb
2020-09-11472174ND
2020-09-11472186ND
2020-09-11472182ND
2020-09-174751750.260 ppb
2021-09-2110516380.460 ppb
2022-09-2912419040.520 ppb
2023-04-261317741ND
2023-04-2613177431.20 ppb
2023-06-201337392ND
2023-07-181349254ND
2023-07-181349252ND
2023-09-211375161ND