Know Your Environment. Protect Your Health.

Chloroform

Western Lake Estates

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.343 ppb41ND - 1.37 ppb
20190.383 ppb41ND - 1.53 ppb
20200.950 ppb32ND - 1.84 ppb
20210.415 ppb41ND - 1.66 ppb
20220.535 ppb42ND - 1.11 ppb
20230.970 ppb42ND - 2.39 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
2018-09-24Q18380190011.37 ppb
2018-11-15Q1846766001ND
2018-11-15Q1846766009ND
2018-11-15Q1846766017ND
2019-09-17Q1965846001ND
2019-09-17Q1965846003ND
2019-09-17Q1965846005ND
2019-09-17Q19658460121.53 ppb
2020-09-03Q20351870021.01 ppb
2020-09-03Q2035187003ND
2020-09-03Q20351870051.84 ppb
2021-08-12Q2121648001ND
2021-08-12Q21216480061.66 ppb
2021-08-12Q2121648003ND
2021-11-23Q2132786005ND
2022-08-02Q2222020002ND
2022-08-02Q2222020006ND
2022-10-31Q22330560051.03 ppb
2022-10-31Q22330560071.11 ppb
2023-08-23Q23357660011.49 ppb
2023-08-23Q2335766003ND
2023-08-23Q2335766005ND
2023-08-23Q23357660132.39 ppb