Know Your Environment. Protect Your Health.

Chloroform

Vera Water & Power

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.

 

44

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0688 ppb81ND - 0.550 ppb
20190.263 ppb92ND - 1.39 ppb
2020N/A00N/A
20210.0563 ppb81ND - 0.450 ppb
20220.0340 ppb152ND - 0.270 ppb
2023ND40ND

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
2018-08-16ND
2018-08-16ND
2018-08-16ND
2018-08-160.550 ppb
2018-08-29ND
2018-08-29ND
2018-08-29ND
2018-08-29ND
2019-08-29ND
2019-09-03ND
2019-09-03ND
2019-09-03ND
2019-09-03ND
2019-09-30ND
2019-09-300.980 ppb
2019-09-30ND
2019-09-301.39 ppb
2021-08-114200732ND
2021-08-114200735ND
2021-08-114200734ND
2021-08-114200733ND
2021-10-154195289ND
2021-10-154195290ND
2021-10-154195291ND
2021-10-1541952920.450 ppb
2022-08-314344785ND
2022-08-314344786ND
2022-08-314344783ND
2022-08-314344784ND
2022-09-1643563160.270 ppb
2022-09-1643563150.240 ppb
2022-09-164356317ND
2022-09-164356318ND
2022-10-034347782ND
2022-10-034347784ND
2022-10-034347781ND
2022-10-034347779ND
2022-10-034347785ND
2022-10-034347783ND
2022-10-034347780ND
2023-09-154524750ND
2023-09-154524752ND
2023-09-154524751ND
2023-09-154524753ND