Know Your Environment. Protect Your Health.

Chloroform

Medway Water and Sewer Department

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.

 

71

Samples

0

Samples exceeding legal limit (MCL)

38

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.53 ppb2017ND - 6.10 ppb
20194.20 ppb2016ND - 11.0 ppb
20201.84 ppb62ND - 8.69 ppb
20210.424 ppb102ND - 2.15 ppb
2022ND70ND
20230.478 ppb86ND - 2.70 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 Result
2018-02-125.50 ppb
2018-02-123.40 ppb
2018-02-125.10 ppb
2018-02-125.80 ppb
2018-05-08ND
2018-05-082.10 ppb
2018-05-08ND
2018-05-08ND
2018-05-083.10 ppb
2018-05-085.50 ppb
2018-05-081.90 ppb
2018-06-250.560 ppb
2018-08-075.40 ppb
2018-08-075.80 ppb
2018-08-072.00 ppb
2018-08-072.90 ppb
2018-11-054.00 ppb
2018-11-055.70 ppb
2018-11-056.10 ppb
2018-11-055.70 ppb
2019-02-122.70 ppb
2019-02-124.90 ppb
2019-02-125.80 ppb
2019-02-124.20 ppb
2019-05-074.30 ppb
2019-05-074.70 ppb
2019-05-07ND
2019-05-074.40 ppb
2019-05-07ND
2019-05-07ND
2019-05-07ND
2019-05-073.60 ppb
2019-08-129.70 ppb
2019-08-1211.0 ppb
2019-08-126.70 ppb
2019-08-129.40 ppb
2019-11-123.80 ppb
2019-11-123.40 ppb
2019-11-122.60 ppb
2019-11-122.80 ppb
2020-06-16ND
2020-06-16ND
2020-06-16ND
2020-06-16ND
2020-08-128.69 ppb
2020-08-122.32 ppb
2021-04-27ND
2021-04-27ND
2021-04-27ND
2021-04-27ND
2021-04-27ND
2021-04-27ND
2021-08-112.09 ppb
2021-08-11ND
2021-08-112.15 ppb
2021-10-25ND
2022-01-05ND
2022-04-20ND
2022-04-20ND
2022-04-20ND
2022-04-20ND
2022-04-20ND
2022-04-20ND
2023-04-190.230 ppb
2023-04-190.240 ppb
2023-04-190.260 ppb
2023-04-19ND
2023-04-190.200 ppb
2023-04-190.190 ppb
2023-04-19ND
2023-08-282.70 ppb