Know Your Environment. Protect Your Health.

Chloroform

Lakeshore Water System

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
20210.820 ppb31ND - 2.46 ppb
2022ND30ND
2023ND50ND

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
2018-09-25Q1838344001ND
2018-10-25Q1842857002ND
2018-10-25Q1842857003ND
2019-09-18Q1967045001ND
2019-10-22Q1973213002ND
2019-10-22Q1973213004ND
2020-09-17Q2037242001ND
2020-11-30Q2047385001ND
2020-11-30Q2047385003ND
2021-07-20Q21189540092.46 ppb
2021-07-20Q2118954003ND
2021-12-06Q2133665006ND
2022-09-06Q2226304001ND
2022-10-05Q2230095002ND
2022-10-05Q2230095004ND
2023-05-03Q2316787001ND
2023-05-03Q2316787009ND
2023-08-21Q2335107003ND
2023-09-18Q2339829001ND
2023-11-02Q2347035001ND