Know Your Environment. Protect Your Health.

Chloroform

Fort Johnson South Water System

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)

43

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.410 ppb42ND - 0.820 ppb
20190.830 ppb440.780 ppb - 0.880 ppb
20200.615 ppb220.540 ppb - 0.690 ppb
20210.942 ppb660.600 ppb - 1.20 ppb
20221.04 ppb1615ND - 2.40 ppb
20230.935 ppb1614ND - 2.00 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
2018-07-25354073050010.820 ppb
2018-07-2535407305002ND
2018-07-25354073050010.820 ppb
2018-07-2535407305002ND
2019-07-25354851950020.780 ppb
2019-07-25354851950010.880 ppb
2019-07-25354851950020.780 ppb
2019-07-25354851950010.880 ppb
2020-07-22355655180010.690 ppb
2020-07-22355655180020.540 ppb
2021-07-08356461220010.750 ppb
2021-07-08356461220021.20 ppb
2021-10-25356739780040.910 ppb
2021-10-25356739780010.990 ppb
2021-10-25356739780021.20 ppb
2021-10-25356739780030.600 ppb
2022-01-19356919350010.820 ppb
2022-01-19356919350040.880 ppb
2022-01-19356919350030.620 ppb
2022-01-19356919350020.760 ppb
2022-04-20357127280040.960 ppb
2022-04-20357127280030.690 ppb
2022-04-20357127280021.20 ppb
2022-04-20357127280011.40 ppb
2022-07-07357300770041.90 ppb
2022-07-07357300770030.920 ppb
2022-07-07357300770022.20 ppb
2022-07-07357300770012.40 ppb
2022-10-03357503430010.940 ppb
2022-10-0335750343003ND
2022-10-03357503430020.510 ppb
2022-10-03357503430040.460 ppb
2023-01-0535770746003ND
2023-01-05357707460040.540 ppb
2023-01-05357707460020.580 ppb
2023-01-05357707460010.820 ppb
2023-04-12357924710040.790 ppb
2023-04-12357924710030.600 ppb
2023-04-12357924710021.30 ppb
2023-04-12357924710011.20 ppb
2023-07-05358112280012.00 ppb
2023-07-05358112280021.90 ppb
2023-07-05358112280030.680 ppb
2023-07-05358112280041.30 ppb
2023-10-16358356870011.20 ppb
2023-10-16358356870021.20 ppb
2023-10-1635835687003ND
2023-10-16358356870040.850 ppb