Know Your Environment. Protect Your Health.

Chloroform

Tennessee Water Supply Corporation

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20191.98 ppb32ND - 3.14 ppb
2020ND50ND
20210.224 ppb51ND - 1.12 ppb
2022ND50ND
20231.16 ppb52ND - 3.18 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
2018-09-25Q1838498001ND
2018-11-14Q1846426003ND
2019-08-20Q19570330013.14 ppb
2019-12-05Q19791540012.81 ppb
2019-12-09Q1979270001ND
2020-03-24Q2012417001ND
2020-03-24Q2012417006ND
2020-05-20Q2020361001ND
2020-08-06Q2031210001ND
2020-11-04Q2043075001ND
2021-01-26Q2101843004ND
2021-01-26Q2101843009ND
2021-04-13Q2109399001ND
2021-09-02Q2123957001ND
2021-12-02Q21333200011.12 ppb
2022-02-01Q2203642003ND
2022-02-01Q2203642006ND
2022-04-11Q2210995001ND
2022-09-06Q2226343001ND
2022-11-14Q2234031001ND
2023-03-01Q23082580022.63 ppb
2023-03-01Q23082580063.18 ppb
2023-05-22Q2319040001ND
2023-07-20Q2328766001ND
2023-10-02Q2342097001ND