Know Your Environment. Protect Your Health.

Chloroform

Desert Water Supply Corporation

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)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.24 ppb331.01 ppb - 1.48 ppb
20190.640 ppb31ND - 1.92 ppb
20201.12 ppb32ND - 1.78 ppb
20211.14 ppb32ND - 1.82 ppb
20220.777 ppb32ND - 1.33 ppb
20230.507 ppb31ND - 1.52 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
2018-04-19Q18162260141.48 ppb
2018-04-19Q18162260101.01 ppb
2018-06-20Q18246890021.23 ppb
2019-05-14Q1924857002ND
2019-05-14Q1924857004ND
2019-05-14Q19248570101.92 ppb
2020-06-30Q2025933001ND
2020-06-30Q20259330031.58 ppb
2020-06-30Q20259330091.78 ppb
2021-09-21Q2125878005ND
2021-09-21Q21258780151.61 ppb
2021-09-21Q21258780141.82 ppb
2022-05-10Q2213913001ND
2022-05-10Q22139130041.33 ppb
2022-05-10Q22139130101.000 ppb
2023-09-19Q2340246001ND
2023-09-19Q2340246003ND
2023-09-19Q23402460101.52 ppb