Chloroform

Stoddard County Public Water Supply District 4

NOTE: Stoddard County Public Water Supply District 4 purchases water from Stoddard County Public Water Supply District 1 which is required to test for chloroform. Sample information shown below was taken by Stoddard County Public Water Supply District 1.

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	2	ND
2015	ND	1	ND
2016	ND	1	ND
2017	ND	1	ND
2018	ND	1	ND
2019	ND	1	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-08-12	AC30905	ND
2015-08-05	AC54494	ND
2015-10-21	AC62029	ND
2016-07-27	AC79843	ND
2017-07-26	AD01584	ND
2018-07-26	AD29336	ND
2018-10-16	AD35150	ND
2019-08-07	AD51949	ND