Know Your Environment. Protect Your Health.

Chloroform

Cedar Point

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)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND40ND
2020ND60ND
20210.233 ppb61ND - 1.40 ppb
20220.383 ppb62ND - 1.30 ppb
20230.350 ppb62ND - 1.10 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
2018-02-15AE14107ND
2018-03-28AE20642ND
2018-05-23AE27412ND
2019-02-28AE56560ND
2019-02-28AE56596ND
2019-05-28AE68197ND
2019-05-28AE68232ND
2020-02-18AE98742ND
2020-02-18AE98744ND
2020-06-08AF14371ND
2020-06-08AF14416ND
2020-09-01AF26048ND
2020-11-05AF33500ND
2021-03-11AF46545ND
2021-03-11AF46547ND
2021-05-24AF55095ND
2021-05-24AF55139ND
2021-09-13AF695481.40 ppb
2021-11-02AF75613ND
2022-01-31AF82593ND
2022-01-31AF82597ND
2022-04-19AF936611.000 ppb
2022-08-18AG099411.30 ppb
2022-08-18AG10060ND
2022-12-20AG22382ND
2023-02-21AG29727ND
2023-02-21AG29729ND
2023-04-19AG373711.000 ppb
2023-09-06AG55087ND
2023-09-06AG55147ND
2023-12-21AG672801.10 ppb