Know Your Environment. Protect Your Health.

Chloroform

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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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.58 ppb42ND - 3.30 ppb
20191.87 ppb32ND - 3.00 ppb
20201.28 ppb220.660 ppb - 1.90 ppb
2021ND10ND
20225.50 ppb21ND - 11.0 ppb
2023ND20ND

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
2018-01-23AJ769573.00 ppb
2018-04-09AJ87016ND
2018-07-18AJ94739ND
2018-10-24AK047773.30 ppb
2019-01-22AK098163.00 ppb
2019-04-22AK155672.60 ppb
2019-06-25AK20887ND
2020-02-19AK418410.660 ppb
2020-02-19AK418421.90 ppb
2021-02-15AK69954ND
2022-03-03AK9636811.0 ppb
2022-07-07AL05046ND
2023-05-11AL31582ND
2023-10-11AL46949ND