Know Your Environment. Protect Your Health.

Chloroform

Northwest Harris County Municipal Utility District 19

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
2022ND30ND
2023ND30ND

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
2018-05-17AE26819ND
2018-05-17AE26823ND
2018-05-17AE26742ND
2019-09-05AE82235ND
2019-11-07AE88931ND
2019-11-07AE88937ND
2020-09-01AF26035ND
2020-10-01AF29290ND
2020-10-01AF29300ND
2021-06-10AF57434ND
2021-06-10AF57537ND
2021-06-10AF57515ND
2022-05-17AF97214ND
2022-05-17AF97248ND
2022-05-17AF97250ND
2023-07-20AG49567ND
2023-07-20AG49615ND
2023-07-20AG49637ND