Know Your Environment. Protect Your Health.

Chloroform

East Hampton WPCA - Village Center

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.175 ppb41ND - 0.700 ppb
20190.150 ppb41ND - 0.600 ppb
2020ND40ND
2021ND40ND
2022ND40ND
20230.325 ppb42ND - 0.700 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
2018-01-30115734GEND
2018-05-07117532GEND
2018-07-10118761GEND
2018-10-231208920.700 ppb
2019-01-151223470.600 ppb
2019-04-16124067ND
2019-09-17127562ND
2019-11-19128973ND
2020-02-04130248ND
2020-04-07131452ND
2020-09-01134519ND
2020-11-03135933ND
2021-01-25137562ND
2021-05-11139690ND
2021-09-21142543ND
2021-12-28144446ND
2022-03-29146620ND
2022-06-21148919ND
2022-09-20151363ND
2022-12-21154119ND
2023-03-15156497ND
2023-06-06159159ND
2023-09-281636020.700 ppb
2023-12-281668350.600 ppb