Know Your Environment. Protect Your Health.

Chloroform

Ainsworth Water Works

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.900 ppb110.900 ppb
20191.40 ppb111.40 ppb
20200.800 ppb110.800 ppb
2021ND10ND
20220.1000 ppb110.1000 ppb
20230.500 ppb110.500 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
2018-08-27OE7050250.900 ppb
2019-08-01OE8433321.40 ppb
2020-08-25OE11971470.800 ppb
2021-08-02OE1783051ND
2022-08-30OE21639670.1000 ppb
2023-08-24OE23274190.500 ppb