Chloroform

City of Kingsburg

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	7	ND
2015	ND	1	ND
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	ND	7	ND
2019	N/A	0	N/A

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
2014-03-25	5867-013-1155	ND
2014-12-18	5867-006-1205	ND
2014-12-18	5867-009-1225	ND
2014-12-18	5867-010-1155	ND
2014-12-18	5867-011-1130	ND
2014-12-18	5867-012-1115	ND
2014-12-18	5867-013-1145	ND
2015-12-17	5867-007-1300	ND
2018-01-24	5810-006-1130	ND
2018-01-24	5810-009-1010	ND
2018-01-24	5810-010-1045	ND
2018-01-24	5810-011-0930	ND
2018-01-24	5810-012-0950	ND
2018-01-24	5810-013-1100	ND
2018-12-11	5810-007-0950	ND