Dichloroacetic acid

South Bayou Macon Ws

Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. 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	Detections	Range of results
2014	ND	4	0	ND
2015	ND	4	0	ND
2016	ND	4	0	ND
2017	1.65 ppb	4	4	1.50 ppb - 1.80 ppb
2018	0.950 ppb	4	4	0.930 ppb - 0.970 ppb
2019	0.600 ppb	4	2	ND - 1.20 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.2 ppb

The EWG Health Guideline of 0.2 ppb for dichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.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	1326979	ND
2014-08-12	1326978	ND
2014-08-12	1326979	ND
2014-08-12	1326978	ND
2015-08-11	1418993	ND
2015-08-11	1418993	ND
2015-08-11	1418994	ND
2015-08-11	1418994	ND
2016-08-08	1514715	ND
2016-08-08	1514716	ND
2016-08-08	1514716	ND
2016-08-08	1514715	ND
2017-08-01	35328002026	1.50 ppb
2017-08-01	35328002026	1.50 ppb
2017-08-01	35328002025	1.80 ppb
2017-08-01	35328002025	1.80 ppb
2018-08-02	35408812002	0.970 ppb
2018-08-02	35408812001	0.930 ppb
2018-08-02	35408812001	0.930 ppb
2018-08-02	35408812002	0.970 ppb
2019-08-21	35493004001	ND
2019-08-21	35493004002	1.20 ppb
2019-08-21	35493004001	ND
2019-08-21	35493004002	1.20 ppb