Know Your Environment. Protect Your Health.

Chloroform

Quincy Water Department City Of

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND20ND
2020N/A00N/A
2021ND30ND
2022ND80ND
20230.154 ppb52ND - 0.520 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
2018-09-18ND
2019-09-09ND
2019-10-02ND
2021-06-164131878ND
2021-06-164132530ND
2021-09-174196548ND
2022-03-044258466ND
2022-03-224258506ND
2022-08-164338185ND
2022-08-164338187ND
2022-09-084510963ND
2022-09-134344891ND
2022-10-064356345ND
2022-10-064356344ND
2023-03-094427806ND
2023-04-1844644580.250 ppb
2023-09-264526082ND
2023-10-034526155ND
2023-10-1245315690.520 ppb