Know Your Environment. Protect Your Health.

Chloroform

Battle Ground Water Department

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)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020N/A00N/A
20210.823 ppb42ND - 2.40 ppb
20220.917 ppb63ND - 2.80 ppb
20231.28 ppb51ND - 6.40 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
2018-04-10ND
2018-07-18ND
2018-08-08ND
2018-08-08ND
2019-05-21ND
2019-08-13ND
2019-08-13ND
2019-11-07ND
2021-06-234188694ND
2021-08-2441942952.40 ppb
2021-08-2441942910.890 ppb
2021-10-194194906ND
2022-05-314292478ND
2022-05-314292477ND
2022-06-294303896ND
2022-08-3044256672.80 ppb
2022-08-3044256661.60 ppb
2022-10-2743706561.10 ppb
2023-06-074473915ND
2023-07-184488413ND
2023-09-2745315396.40 ppb
2023-09-274531538ND
2023-12-054570035ND