Know Your Environment. Protect Your Health.

Chloroform

Tri Community Water Supply Corporation

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.560 ppb52ND - 1.70 ppb
20190.260 ppb51ND - 1.30 ppb
20200.800 ppb53ND - 1.50 ppb
20210.780 ppb53ND - 1.50 ppb
20220.880 ppb54ND - 1.30 ppb
20230.940 ppb53ND - 1.80 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
2018-02-08AE12983ND
2018-04-17AE22740ND
2018-08-23AE382461.10 ppb
2018-08-23AE38272ND
2018-10-31AE450311.70 ppb
2019-02-27AE56198ND
2019-05-29AE68347ND
2019-08-19AE792101.30 ppb
2019-08-19AE79316ND
2019-10-29AE87831ND
2020-02-26AE99976ND
2020-04-16AF069581.50 ppb
2020-08-17AF236801.40 ppb
2020-08-17AF23702ND
2020-10-15AF308241.10 ppb
2021-01-20AF40041ND
2021-04-14AF501041.30 ppb
2021-08-18AF667451.10 ppb
2021-08-18AF66768ND
2021-10-14AF735301.50 ppb
2022-01-11AF79634ND
2022-05-03AF953121.000 ppb
2022-07-19AG052561.30 ppb
2022-07-19AG053291.000 ppb
2022-10-24AG180191.10 ppb
2023-01-12AG24340ND
2023-05-01AG385831.20 ppb
2023-08-08AG517791.70 ppb
2023-08-08AG51819ND
2023-10-19AG603991.80 ppb