Know Your Environment. Protect Your Health.

Chloroform

Hillside Village

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.

 

7

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.1000 ppb220.1000 ppb
20190.400 ppb110.400 ppb
20200.340 ppb110.340 ppb
20210.400 ppb110.400 ppb
20220.260 ppb110.260 ppb
20231.10 ppb111.10 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
2018-08-13L7053842-10.1000 ppb
2018-09-05L7063121-10.1000 ppb
2019-08-13L7145911-10.400 ppb
2020-08-17630-5811-10.340 ppb
2021-08-11630-20604-10.400 ppb
2022-08-11630-42471-1-THM0.260 ppb
2023-08-09630-69079-11.10 ppb