Know Your Environment. Protect Your Health.

Chloroform

Wigwam Mutual Water Company

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.525 ppb43ND - 0.800 ppb
20190.200 ppb41ND - 0.800 ppb
20200.725 ppb440.500 ppb - 1.000 ppb
20210.615 ppb43ND - 1.000 ppb
20220.882 ppb54ND - 1.40 ppb
20231.10 ppb440.650 ppb - 1.70 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 Result
2018-02-070.500 ppb
2018-04-03ND
2018-07-100.800 ppb
2018-10-020.800 ppb
2019-01-02ND
2019-04-02ND
2019-07-02ND
2019-10-010.800 ppb
2020-01-070.600 ppb
2020-04-060.500 ppb
2020-07-011.000 ppb
2020-10-050.800 ppb
2021-01-18ND
2021-04-120.600 ppb
2021-07-061.000 ppb
2021-10-060.860 ppb
2022-01-170.780 ppb
2022-03-07ND
2022-04-040.930 ppb
2022-07-051.40 ppb
2022-10-111.30 ppb
2023-01-230.650 ppb
2023-04-100.660 ppb
2023-07-171.70 ppb
2023-10-021.40 ppb