Know Your Environment. Protect Your Health.

Chloroform

Gove, City of

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.725 ppb42ND - 1.50 ppb
20190.367 ppb31ND - 1.10 ppb
2020ND50ND
20210.198 ppb41ND - 0.790 ppb
2022ND30ND
2023ND10ND

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
2018-03-20937817ND
2018-06-209912301.50 ppb
2018-09-2610503891.40 ppb
2018-12-191093568ND
2019-03-251138395ND
2019-07-171206048ND
2019-09-2512480901.10 ppb
2020-01-081304873ND
2020-03-251346429ND
2020-06-241414912ND
2020-09-231518310ND
2020-12-151712173ND
2021-04-071813780ND
2021-06-231867262ND
2021-09-221966507ND
2021-12-1520759300.790 ppb
2022-03-282223656ND
2022-06-272287679ND
2022-09-212363323ND
2023-10-042587381ND