Know Your Environment. Protect Your Health.

Chloroform

Montgomery County Municipal Utility District 8

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)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
20190.433 ppb31ND - 1.30 ppb
2020ND30ND
20210.700 ppb31ND - 2.10 ppb
2022ND30ND
20231.07 ppb331.000 ppb - 1.20 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
2018-01-10AE08627ND
2018-01-10AE08615ND
2018-06-25AE31183ND
2019-08-06AE772201.30 ppb
2019-08-06AE77267ND
2019-08-06AE77285ND
2020-09-02AF26185ND
2020-10-19AF31112ND
2020-10-19AF31128ND
2021-02-08AF43032ND
2021-02-08AF430342.10 ppb
2021-09-02AF68736ND
2022-08-23AG10476ND
2022-08-23AG10564ND
2022-12-13AG21661ND
2023-07-05AG469911.20 ppb
2023-07-05AG470591.000 ppb
2023-07-05AG470611.000 ppb