Know Your Environment. Protect Your Health.

Chloroform

Mccoy 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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND110ND
2019ND50ND
2020ND90ND
2021ND50ND
2022ND50ND
2023ND80ND

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
2018-02-05AE12217ND
2018-02-05AE12216ND
2018-02-05AE12261ND
2018-02-05AE12257ND
2018-02-05AE12259ND
2018-06-11AE29186ND
2018-06-11AE29214ND
2018-08-01AE35266ND
2018-08-01AE35268ND
2018-10-02AE42510ND
2018-10-02AE42522ND
2019-06-05AE69208ND
2019-06-05AE69258ND
2019-06-05AE69256ND
2019-06-05AE69207ND
2019-11-18AE89581ND
2020-03-26AF04716ND
2020-03-26AF04726ND
2020-03-26AF04728ND
2020-06-10AF14870ND
2020-06-10AF14868ND
2020-06-10AF14803ND
2020-06-10AF14805ND
2020-07-07AF18403ND
2020-07-07AF18407ND
2021-06-28AF59637ND
2021-06-28AF59640ND
2021-06-28AF59681ND
2021-09-20AF70457ND
2021-09-20AF70459ND
2022-07-05AG03259ND
2022-07-05AG03263ND
2022-07-05AG03261ND
2022-07-05AG03242ND
2022-07-05AG03241ND
2023-05-03AG39114ND
2023-05-03AG39115ND
2023-05-03AG39139ND
2023-05-03AG39145ND
2023-05-03AG39151ND
2023-05-03AG39153ND
2023-09-15AG56654ND
2023-10-02AG58143ND