Know Your Environment. Protect Your Health.

Chloroform

Town of Mount Jackson

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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201813.9 ppb221.80 ppb - 26.0 ppb
201916.1 ppb221.10 ppb - 31.0 ppb
202020.3 ppb86ND - 91.0 ppb
20216.39 ppb127ND - 24.0 ppb
20220.175 ppb41ND - 0.700 ppb
2023ND30ND

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
2018-09-04E18060890226.0 ppb
2018-09-04E1806089061.80 ppb
2019-09-09E19060722831.0 ppb
2019-09-09E1906072261.10 ppb
2020-02-18E191203825ND
2020-02-18E191203827ND
2020-02-18E1912038234.00 ppb
2020-07-20E20060264291.0 ppb
2020-07-20E20060264416.0 ppb
2020-10-26E2009029320.600 ppb
2020-11-17E20110008136.0 ppb
2020-11-17E20110007915.0 ppb
2021-02-08E210102022ND
2021-02-16E20120305023.0 ppb
2021-02-16E2012030452.90 ppb
2021-05-18E21040225824.0 ppb
2021-05-18E2104022560.600 ppb
2021-05-27E210504305ND
2021-07-12E2106031001.10 ppb
2021-08-25E21060309824.0 ppb
2021-08-25E2106030991.10 ppb
2021-08-30E210804640ND
2021-10-06E210907067ND
2021-10-06E210907066ND
2022-02-08E211203740ND
2022-04-13E220305357ND
2022-07-19E2206051900.700 ppb
2022-07-19E220605191ND
2023-04-12E230302422ND
2023-07-18E230602231ND
2023-07-18E230602232ND