Know Your Environment. Protect Your Health.

Chloroform

Whitworth Water District 2

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND130ND
2020N/A00N/A
2021ND30ND
2022ND110ND
2023ND10ND

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
2018-03-20ND
2019-04-18ND
2019-04-18ND
2019-04-18ND
2019-04-18ND
2019-05-09ND
2019-05-21ND
2019-05-21ND
2019-05-28ND
2019-05-28ND
2019-05-28ND
2019-05-28ND
2019-06-18ND
2019-06-21ND
2021-03-184094088ND
2021-07-084138074ND
2021-10-284196693ND
2022-01-244236842ND
2022-03-314261610ND
2022-04-214272384ND
2022-04-214272380ND
2022-05-184288406ND
2022-06-274309802ND
2022-06-274309800ND
2022-07-144309808ND
2022-07-144309809ND
2022-07-144309807ND
2022-10-114356380ND
2023-04-274452170ND