Know Your Environment. Protect Your Health.

Chloroform

Riverbridge

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

29

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.980 ppb54ND - 1.90 ppb
20190.950 ppb1613ND - 1.80 ppb
20200.760 ppb54ND - 1.10 ppb
20210.680 ppb550.500 ppb - 1.000 ppb
20220.120 ppb51ND - 0.600 ppb
20230.203 ppb74ND - 0.450 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
2018-12-190.600 ppb
2018-12-19ND
2018-12-191.90 ppb
2018-12-191.20 ppb
2018-12-191.20 ppb
2019-01-10ND
2019-01-101.10 ppb
2019-01-101.70 ppb
2019-01-101.20 ppb
2019-02-250.500 ppb
2019-02-261.40 ppb
2019-02-26ND
2019-02-261.60 ppb
2019-02-261.20 ppb
2019-04-051.80 ppb
2019-04-051.40 ppb
2019-04-051.000 ppb
2019-04-05ND
2019-04-050.800 ppb
2019-08-220.700 ppb
2019-10-220.800 ppb
2020-05-26ND
2020-05-260.800 ppb
2020-05-261.000 ppb
2020-05-260.900 ppb
2020-05-261.10 ppb
2021-06-020.700 ppb
2021-06-020.600 ppb
2021-06-020.600 ppb
2021-06-021.000 ppb
2021-06-020.500 ppb
2022-04-22ND
2022-04-22ND
2022-04-220.600 ppb
2022-04-22ND
2022-04-22ND
2023-04-05ND
2023-04-05ND
2023-04-050.300 ppb
2023-04-05ND
2023-04-050.260 ppb
2023-08-290.450 ppb
2023-08-290.410 ppb