Know Your Environment. Protect Your Health.

Chloroform

Desoto PWS

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.980 ppb110.980 ppb
20190.740 ppb110.740 ppb
20200.183 ppb31ND - 0.550 ppb
2021ND10ND
2022ND10ND
20230.190 ppb31ND - 0.570 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
2018-09-19AD330680.980 ppb
2019-09-24AD553730.740 ppb
2020-09-2120161390.550 ppb
2020-10-262013356ND
2020-10-262013355ND
2021-09-202117042ND
2022-10-032220441ND
2023-08-142313806ND
2023-08-142313805ND
2023-09-2523153920.570 ppb