Know Your Environment. Protect Your Health.

Chloroform

Benton City Water

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
20190.250 ppb21ND - 0.500 ppb
2020N/A00N/A
2021ND20ND
2022ND60ND
20230.380 ppb220.320 ppb - 0.440 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
2018-03-20ND
2018-08-20ND
2018-08-20ND
2019-08-280.500 ppb
2019-08-28ND
2021-12-154220404ND
2021-12-154220406ND
2022-01-264242151ND
2022-03-224263115ND
2022-03-224263110ND
2022-03-224263126ND
2022-08-034333140ND
2022-08-034333173ND
2023-08-2345811440.320 ppb
2023-08-2345811560.440 ppb