Know Your Environment. Protect Your Health.

Chloroform

Grand Harbor Water System

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
2022ND50ND
2023ND30ND

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
2018-06-19AE30463ND
2018-06-19AE30487ND
2018-06-19AE30450ND
2019-06-13AE70588ND
2019-06-13AE70599ND
2019-06-13AE70603ND
2020-07-16AF19687ND
2020-07-16AF19727ND
2020-07-16AF19731ND
2021-08-04AF64809ND
2021-08-04AF64813ND
2021-08-04AF64801ND
2022-03-08AF88096ND
2022-03-08AF88116ND
2022-06-01AF99031ND
2022-06-01AF99089ND
2022-09-29AG15480ND
2023-08-09AG51968ND
2023-08-09AG51989ND
2023-08-09AG51991ND