Know Your Environment. Protect Your Health.

Chloroform

Forks Municipal 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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20190.410 ppb32ND - 0.980 ppb
2020N/A00N/A
2021ND30ND
20220.200 ppb51ND - 1.000 ppb
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
2018-12-05ND
2018-12-05ND
2019-08-070.250 ppb
2019-08-21ND
2019-08-300.980 ppb
2021-08-254175304ND
2021-08-254166498ND
2021-08-254166499ND
2022-05-094306680ND
2022-08-094333828ND
2022-08-3043704501.000 ppb
2022-11-014371620ND
2022-11-014379296ND
2023-01-174404440ND
2023-08-224513302ND
2023-08-224513301ND