Know Your Environment. Protect Your Health.

Chloroform

Colchester Estates

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.

 

8

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.600 ppb110.600 ppb
20191.20 ppb111.20 ppb
20200.603 ppb32ND - 1.20 ppb
2021ND10ND
2022ND10ND
20230.590 ppb110.590 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
2018-08-29D8H3449-01VOCR0.600 ppb
2019-08-26CD92643R1.20 ppb
2020-04-15CF743870.610 ppb
2020-07-28CG43157ND
2020-12-15CH325731.20 ppb
2021-08-25CJ14198ND
2022-08-31CM20729ND
2023-08-31CP124960.590 ppb