Know Your Environment. Protect Your Health.

Chloroform

City of Ralls

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.88 ppb41ND - 7.50 ppb
2019ND40ND
2020ND40ND
2021ND40ND
2022ND40ND
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
2018-02-06Q1804612001ND
2018-04-24Q1816512002ND
2018-07-17Q18282310017.50 ppb
2018-11-29Q1848723001ND
2019-03-12Q1910243001ND
2019-05-01Q1917588001ND
2019-08-08Q1952885001ND
2019-10-09Q1972066001ND
2020-03-18Q2011846001ND
2020-05-14Q2019552001ND
2020-08-24Q2033886001ND
2020-11-16Q2044959001ND
2021-03-04Q2105771001ND
2021-04-29Q2110927002ND
2021-08-11Q2121424001ND
2021-12-02Q2133345001ND
2022-03-14Q2208565001ND
2022-06-02Q2215630001ND
2022-09-06Q2226330002ND
2022-12-08Q2236958001ND
2023-02-09Q2305228001ND
2023-04-27Q2315859002ND
2023-08-17Q2334684001ND
2023-10-11Q2343430001ND