Know Your Environment. Protect Your Health.

Chloroform

Mount Houston Road Municipal Utility District

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)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
20220.767 ppb31ND - 2.30 ppb
20233.67 ppb31ND - 11.0 ppb

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
2018-06-18AE30242ND
2018-06-18AE30246ND
2018-06-18AE30193ND
2019-07-15AE74324ND
2019-07-15AE74415ND
2019-07-15AE74417ND
2020-07-09AF18842ND
2020-07-09AF18907ND
2020-07-09AF18911ND
2021-06-14AF57723ND
2021-06-14AF57830ND
2021-06-14AF57828ND
2022-05-05AF95659ND
2022-05-05AF957282.30 ppb
2022-05-05AF95730ND
2023-06-01AG42760ND
2023-06-01AG42806ND
2023-11-09AG6306311.0 ppb