Know Your Environment. Protect Your Health.

Chloroform

Mustang Valley Water Supply Corporation

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.

 

37

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.260 ppb61ND - 1.56 ppb
2019ND60ND
20200.233 ppb71ND - 1.63 ppb
20210.212 ppb61ND - 1.27 ppb
2022ND60ND
2023ND60ND

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
2018-02-20Q1806881002ND
2018-09-17Q18368590031.56 ppb
2018-11-28Q1848373003ND
2018-11-28Q1848373005ND
2018-11-28Q1848373006ND
2018-11-28Q1848373008ND
2019-03-13Q1910654001ND
2019-03-13Q1910654005ND
2019-03-13Q1910654009ND
2019-03-13Q1910654013ND
2019-09-11Q1964031002ND
2019-09-11Q1964031005ND
2020-06-10Q20234700021.63 ppb
2020-06-10Q2023470003ND
2020-08-26Q2034243038ND
2020-08-26Q2034243029ND
2020-08-26Q2034243019ND
2020-08-26Q2034243011ND
2020-08-26Q2034243027ND
2021-07-28Q21197590011.27 ppb
2021-07-28Q2119759006ND
2021-07-28Q2119759008ND
2021-07-28Q2119759010ND
2021-07-28Q2119759012ND
2021-07-28Q2119759022ND
2022-06-15Q2216698002ND
2022-10-12Q2230979002ND
2022-10-12Q2230979019ND
2022-10-12Q2230979017ND
2022-10-12Q2230979015ND
2022-10-12Q2230979013ND
2023-07-24Q2329212003ND
2023-07-24Q2329212016ND
2023-07-24Q2329212017ND
2023-10-31Q2346536005ND
2023-10-31Q2346536007ND
2023-10-31Q2346536009ND