Know Your Environment. Protect Your Health.

Chloroform

Crown Ranch Subdivision

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND40ND
2020ND30ND
20210.475 ppb41ND - 1.90 ppb
2022ND30ND
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
2018-06-14AE30058ND
2018-06-14AE30011ND
2019-01-16AE50150ND
2019-04-16AE62572ND
2019-08-21AE79910ND
2019-12-09AE91676ND
2020-01-27AE95380ND
2020-01-27AE95388ND
2020-08-20AF24566ND
2021-08-02AF64207ND
2021-08-02AF642461.90 ppb
2021-08-02AF64244ND
2021-11-01AF75265ND
2022-01-20AF81008ND
2022-01-20AF81018ND
2022-08-03AG07586ND
2023-07-18AG48977ND
2023-07-18AG49042ND
2023-07-18AG49088ND