Know Your Environment. Protect Your Health.

Chloroform

Randolph 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.

 

64

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND160ND
2019ND160ND
20200.348 ppb85ND - 0.650 ppb
2021ND80ND
2022ND80ND
20238.21 ppb81ND - 65.7 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
2018-01-1235368412001ND
2018-01-1235368412002ND
2018-01-1235368412002ND
2018-01-1235368412001ND
2018-04-1135386285002ND
2018-04-1135386285001ND
2018-04-1135386285002ND
2018-04-1135386285001ND
2018-07-2435407090001ND
2018-07-2435407090002ND
2018-07-2435407090001ND
2018-07-2435407090002ND
2018-10-1135424027001ND
2018-10-1135424027001ND
2018-10-1135424027002ND
2018-10-1135424027002ND
2019-01-0435440261001ND
2019-01-0435440261002ND
2019-01-0435440261001ND
2019-01-0435440261002ND
2019-04-1035461252001ND
2019-04-1035461252002ND
2019-04-1035461252001ND
2019-04-1035461252002ND
2019-07-2435484756002ND
2019-07-2435484756001ND
2019-07-2435484756001ND
2019-07-2435484756002ND
2019-10-1735506296001ND
2019-10-1735506296002ND
2019-10-1735506296002ND
2019-10-1735506296001ND
2020-01-24355264960020.570 ppb
2020-01-24355264960010.540 ppb
2020-04-09355429460010.610 ppb
2020-04-09355429460020.650 ppb
2020-07-2435566128001ND
2020-07-24355661280020.410 ppb
2020-10-1435585708001ND
2020-10-1435585708002ND
2021-01-2135606714001ND
2021-01-2135606714002ND
2021-04-2635629194001ND
2021-04-2635629194002ND
2021-07-2835651728001ND
2021-07-2835651728002ND
2021-10-2135672646001ND
2021-10-2135672646002ND
2022-01-1135690782002ND
2022-01-1135690782001ND
2022-04-2035712724002ND
2022-04-2035712724001ND
2022-07-1335731902001ND
2022-07-1335731902002ND
2022-10-1035753730001ND
2022-10-1035753730002ND
2023-01-0535770999001ND
2023-01-0535770999002ND
2023-04-0535790905001ND
2023-04-0535790905002ND
2023-07-1035812723001ND
2023-07-1035812723002ND
2023-10-0435832826001ND
2023-10-043583282600265.7 ppb