Know Your Environment. Protect Your Health.

Chloroform

Parkville Water District

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.

 

61

Samples

0

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201815.9 ppb109ND - 34.0 ppb
20198.82 ppb990.820 ppb - 25.7 ppb
20207.01 ppb98ND - 29.7 ppb
20215.48 ppb94ND - 22.0 ppb
202212.2 ppb129ND - 54.7 ppb
20238.97 ppb129ND - 34.4 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 Result
2018-02-130.710 ppb
2018-02-131.50 ppb
2018-06-2120.7 ppb
2018-06-2133.0 ppb
2018-08-2815.0 ppb
2018-08-2826.0 ppb
2018-12-0426.1 ppb
2018-12-0434.0 ppb
2018-12-05ND
2018-12-052.30 ppb
2019-02-122.90 ppb
2019-02-121.60 ppb
2019-05-2118.3 ppb
2019-05-2111.7 ppb
2019-08-1912.0 ppb
2019-08-1925.7 ppb
2019-11-215.40 ppb
2019-11-210.920 ppb
2019-12-170.820 ppb
2020-02-130.890 ppb
2020-02-132.10 ppb
2020-06-0418.3 ppb
2020-06-043.30 ppb
2020-08-315.10 ppb
2020-08-3129.7 ppb
2020-11-24ND
2020-11-242.50 ppb
2020-12-081.20 ppb
2021-02-09ND
2021-02-093.30 ppb
2021-05-19ND
2021-05-1922.0 ppb
2021-08-17ND
2021-08-1721.0 ppb
2021-11-163.00 ppb
2021-11-17ND
2021-12-14ND
2022-02-080.610 ppb
2022-02-08ND
2022-06-0754.7 ppb
2022-06-077.20 ppb
2022-08-1538.9 ppb
2022-08-155.90 ppb
2022-09-22ND
2022-09-2233.9 ppb
2022-12-211.70 ppb
2022-12-21ND
2022-12-291.20 ppb
2022-12-292.10 ppb
2023-02-240.470 ppb
2023-02-242.00 ppb
2023-03-30ND
2023-05-1711.1 ppb
2023-05-174.00 ppb
2023-06-21ND
2023-08-2215.7 ppb
2023-08-2234.4 ppb
2023-09-20ND
2023-09-2016.1 ppb
2023-11-0710.6 ppb
2023-11-0713.3 ppb