Know Your Environment. Protect Your Health.

Chloroform

American Legion Mia Post 231

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
202312.8 ppb337.28 ppb - 19.1 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
2018-01-10Q1801241002ND
2018-06-25Q1825252003ND
2018-08-30Q1835065002ND
2018-08-30Q1835065008ND
2018-12-11Q1850967002ND
2019-02-25Q1907962001ND
2019-05-30Q1929976001ND
2020-05-26Q2020649002ND
2020-05-26Q2020649005ND
2021-06-01Q2114155005ND
2021-06-01Q2114155011ND
2022-09-21Q2228364001ND
2022-12-13Q2237293002ND
2023-06-26Q232432300119.1 ppb
2023-09-06Q233844800212.0 ppb
2023-12-14Q23536340017.28 ppb