Know Your Environment. Protect Your Health.

Chloroform

City of Jamestown

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.726 ppb880.570 ppb - 0.870 ppb
20190.788 ppb880.500 ppb - 1.11 ppb
20200.679 ppb880.570 ppb - 0.800 ppb
20210.864 ppb880.680 ppb - 1.34 ppb
20220.790 ppb880.520 ppb - 1.04 ppb
20230.900 ppb880.710 ppb - 1.18 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
2018-01-1718-S770.670 ppb
2018-01-1718-S780.570 ppb
2018-04-1618-S5250.850 ppb
2018-04-1618-S5240.840 ppb
2018-07-1818-S11940.680 ppb
2018-07-1818-S11930.590 ppb
2018-10-1518-S22620.740 ppb
2018-10-1518-S22610.870 ppb
2019-01-1519-S450.610 ppb
2019-01-1519-S440.500 ppb
2019-04-1619-S4360.800 ppb
2019-04-1619-S4350.600 ppb
2019-07-1519-S11290.680 ppb
2019-07-1519-S11280.930 ppb
2019-10-1419-S23221.11 ppb
2019-10-1419-S23231.07 ppb
2020-01-133602700.640 ppb
2020-01-133602690.660 ppb
2020-04-133630760.740 ppb
2020-04-133630750.640 ppb
2020-07-213685660.800 ppb
2020-07-213696160.570 ppb
2020-10-133723620.780 ppb
2020-10-133723610.600 ppb
2021-01-123759101.34 ppb
2021-01-123759090.740 ppb
2021-04-133787870.740 ppb
2021-04-133787860.740 ppb
2021-07-203834140.810 ppb
2021-07-203834130.680 ppb
2021-10-113891021.01 ppb
2021-10-113891010.850 ppb
2022-01-113911890.760 ppb
2022-01-113911920.820 ppb
2022-04-113942260.520 ppb
2022-04-113942250.530 ppb
2022-07-193984321.04 ppb
2022-07-193984341.01 ppb
2022-10-044025610.780 ppb
2022-10-044025600.860 ppb
2023-01-104058401.02 ppb
2023-01-104058411.18 ppb
2023-04-194100880.710 ppb
2023-04-194100890.870 ppb
2023-07-254150640.760 ppb
2023-07-254150630.990 ppb
2023-10-104186320.780 ppb
2023-10-104186330.890 ppb