Know Your Environment. Protect Your Health.

Chloroform

Chaffee PWS

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)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.842 ppb550.650 ppb - 1.01 ppb
20191.08 ppb54ND - 2.08 ppb
20200.768 ppb54ND - 1.36 ppb
20210.732 ppb54ND - 1.19 ppb
20220.764 ppb54ND - 1.53 ppb
20230.634 ppb53ND - 1.32 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
2018-01-10AD120500.650 ppb
2018-05-06AD186630.750 ppb
2018-07-16AD295401.01 ppb
2018-07-23AD292760.820 ppb
2018-10-15AD350600.980 ppb
2019-01-09AD383722.08 ppb
2019-04-08AD46663ND
2019-07-10AD527090.520 ppb
2019-07-22AD518951.56 ppb
2019-10-20AD573711.26 ppb
2020-01-13AD60690ND
2020-04-1520042810.520 ppb
2020-07-1520117040.870 ppb
2020-09-0120117021.09 ppb
2020-10-1820166231.36 ppb
2021-01-1120202220.990 ppb
2021-04-1221038350.590 ppb
2021-07-1221137560.890 ppb
2021-07-122113757ND
2021-10-1921181511.19 ppb
2022-01-0521216470.580 ppb
2022-04-1322043880.840 ppb
2022-07-1122148030.870 ppb
2022-07-2622148021.53 ppb
2022-10-092219685ND
2023-01-092223354ND
2023-04-122303495ND
2023-07-1623117111.32 ppb
2023-07-2623117101.20 ppb
2023-10-1823168660.650 ppb