Know Your Environment. Protect Your Health.

Chloroform

East Lyme Water & Sewer Commission

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0900 ppb101ND - 0.900 ppb
20190.300 ppb103ND - 1.60 ppb
20200.850 ppb42ND - 2.50 ppb
20211.31 ppb330.540 ppb - 1.90 ppb
20221.72 ppb65ND - 4.90 ppb
20231.80 ppb64ND - 4.80 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
2018-02-06115854GE0.900 ppb
2018-02-06115853GEND
2018-02-06115856GEND
2018-02-06115855GEND
2018-05-22117860GEND
2018-05-22117861GEND
2018-09-07120043ND
2018-09-07120044ND
2018-12-18121897ND
2018-12-18121898ND
2019-03-06123278ND
2019-03-06123279ND
2019-06-271256730.900 ppb
2019-06-27125674ND
2019-09-101273891.60 ppb
2019-09-101273900.500 ppb
2019-09-10127391ND
2019-12-18129477ND
2019-12-18129475ND
2019-12-18129476ND
2020-06-12132842ND
2020-06-121328432.50 ppb
2020-06-12132844ND
2020-06-121328450.900 ppb
2021-07-281413390.540 ppb
2021-09-221425521.50 ppb
2021-12-221444361.90 ppb
2022-03-041459580.600 ppb
2022-03-041459591.20 ppb
2022-03-041459574.90 ppb
2022-06-231490011.70 ppb
2022-09-211514471.90 ppb
2022-12-07153661ND
2023-06-071592150.700 ppb
2023-09-18163136ND
2023-09-181631374.30 ppb
2023-09-18163138ND
2023-09-181631394.80 ppb
2023-09-181631401.000 ppb