Know Your Environment. Protect Your Health.

Chloroform

Cws - Upper Bodfish 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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND20ND
2021ND20ND
20220.800 ppb220.800 ppb
20230.750 ppb220.700 ppb - 0.800 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
2018-08-07CA1510026_DST_902-201808070933ND
2018-08-07CA1510026_DST_901-201808070926ND
2019-08-14CA1510026_DST_901-201908141315ND
2019-08-14CA1510026_DST_902-201908141247ND
2020-08-10CA1510026_DST_901-202008101204ND
2020-08-10CA1510026_DST_902-202008101220ND
2021-08-17CA1510026_DST_901-202108170847ND
2021-08-17CA1510026_DST_902-202108170901ND
2022-08-23CA1510026_DST_902-2022082311500.800 ppb
2022-08-23CA1510026_DST_901-2022082311320.800 ppb
2023-08-24CA1510026_DST_901-2023082409210.700 ppb
2023-08-24CA1510026_DST_902-2023082410070.800 ppb