Know Your Environment. Protect Your Health.

Chloroform

River Ridge Estates 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.

 

34

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
202064.9 ppb2248.0 ppb - 81.8 ppb
202176.3 ppb8848.0 ppb - 96.5 ppb
202256.2 ppb86ND - 174.0 ppb
2023ND80ND

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
2018-09-1935419524001ND
2018-09-1935419524002ND
2018-09-1935419524001ND
2018-09-1935419524002ND
2019-09-1035497250002ND
2019-09-1035497250001ND
2019-09-1035497250002ND
2019-09-1035497250001ND
2020-09-293558171800181.8 ppb
2020-09-293558171800248.0 ppb
2021-03-293562279300289.9 ppb
2021-03-293562279300169.4 ppb
2021-06-153564144700187.4 ppb
2021-06-153564144700267.6 ppb
2021-09-293566738300248.0 ppb
2021-09-293566738300178.4 ppb
2021-12-073568343500273.1 ppb
2021-12-073568343500196.5 ppb
2022-03-21357060790012.80 ppb
2022-03-21357060790023.60 ppb
2022-06-273572845100194.1 ppb
2022-06-273572845100254.9 ppb
2022-09-2035748847002ND
2022-09-2035748847001ND
2022-12-0635765787002120.0 ppb
2022-12-0635765787001174.0 ppb
2023-03-2035787779001ND
2023-03-2035787779002ND
2023-06-2035808803001ND
2023-06-2035808803002ND
2023-09-2035829714001ND
2023-09-2035829714002ND
2023-12-1935849946001ND
2023-12-1935849946002ND