Know Your Environment. Protect Your Health.

Chloroform

Summit Water & Supply Company

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)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.625 ppb220.280 ppb - 0.970 ppb
2019ND40ND
2020N/A00N/A
2021ND20ND
20221.05 ppb61ND - 6.30 ppb
20232.92 ppb21ND - 5.84 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
2018-09-180.970 ppb
2018-09-180.280 ppb
2019-08-12ND
2019-08-12ND
2019-09-13ND
2019-09-13ND
2021-09-154179895ND
2021-09-154179896ND
2022-06-164298843ND
2022-08-314366585ND
2022-08-314366584ND
2022-09-064362565ND
2022-09-0643625676.30 ppb
2022-09-234361844ND
2023-09-144529508ND
2023-09-1445295055.84 ppb