Know Your Environment. Protect Your Health.

Chloroform

Erwin Utilities

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

15

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.849 ppb440.754 ppb - 0.945 ppb
20190.964 ppb440.894 ppb - 1.03 ppb
20200.900 ppb220.900 ppb
20210.420 ppb53ND - 0.700 ppb
20221.25 ppb221.20 ppb - 1.30 ppb
2023N/A00N/A

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
2018-02-220.834 ppb
2018-06-130.862 ppb
2018-08-020.945 ppb
2018-10-230.754 ppb
2019-03-121.03 ppb
2019-05-080.967 ppb
2019-08-130.964 ppb
2019-12-120.894 ppb
2020-02-110.900 ppb
2020-02-110.900 ppb
2021-02-100.700 ppb
2021-06-29ND
2021-06-29ND
2021-11-080.700 ppb
2021-11-080.700 ppb
2022-02-151.30 ppb
2022-05-111.20 ppb