Know Your Environment. Protect Your Health.

Chloroform

Tom Green County Fresh Water Supply District 3

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND30ND
2020ND30ND
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
2018-02-21Q1807226003ND
2018-02-21Q1807226002ND
2018-05-10Q1819381005ND
2018-05-10Q1819381010ND
2018-08-09Q1832053001ND
2019-02-28Q1908593002ND
2019-02-28Q1908593004ND
2019-05-16Q1926516001ND
2020-05-20Q2020109002ND
2020-05-20Q2020109003ND
2020-05-20Q2020109005ND
2021-05-19Q2113110007ND
2021-05-19Q2113110018ND
2021-05-19Q2113110017ND
2021-05-19Q2113110009ND
2022-05-19Q2214829001ND
2022-05-19Q2214829003ND
2022-05-19Q2214829009ND
2022-05-19Q2214829010ND
2023-05-18Q2318793005ND
2023-05-18Q2318793006ND
2023-05-18Q2318793007ND
2023-05-18Q2318793009ND