Dichloroacetic acid

City of Redding

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
2013	N/A	0	0	N/A
2014	5.86 ppb	12	9	ND - 14.3 ppb
2015	7.18 ppb	12	7	ND - 19.0 ppb
2016	7.59 ppb	9	6	ND - 17.1 ppb
2017	6.70 ppb	14	7	ND - 19.9 ppb
2018	7.05 ppb	12	7	ND - 17.8 ppb
2019	10.8 ppb	7	7	5.61 ppb - 12.9 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
2014-01-06	1677-803-1320	12.7 ppb
2014-01-06	1677-802-1055	6.10 ppb
2014-01-06	1677-801-0925	1.80 ppb
2014-04-07	1677-803-1325	14.3 ppb
2014-04-07	1677-802-1040	ND
2014-04-07	1677-801-0950	ND
2014-07-01	1677-803-1130	12.7 ppb
2014-07-01	1677-802-1000	1.70 ppb
2014-07-01	1677-801-0830	7.40 ppb
2014-10-02	1677-803-1140	8.90 ppb
2014-10-02	1677-802-0915	ND
2014-10-02	1677-801-0846	4.70 ppb
2015-01-05	1677-803-1155	14.5 ppb
2015-01-05	1677-801-0850	13.0 ppb
2015-01-05	1677-802-1025	ND
2015-04-01	1677-801-1315	ND
2015-04-01	1677-803-1030	12.8 ppb
2015-04-01	1677-802-1250	ND
2015-07-13	1677-802-1100	ND
2015-07-13	1677-803-0950	19.0 ppb
2015-07-13	1677-801-1125	11.6 ppb
2015-10-07	1677-802-1000	ND
2015-10-07	1677-803-1245	9.40 ppb
2015-10-07	1677-801-0835	5.80 ppb
2016-01-05	1677-802-0930	ND
2016-01-05	1677-801-0845	6.35 ppb
2016-01-05	1677-803-1115	4.65 ppb
2016-07-05	1677-801-1310	16.0 ppb
2016-07-05	1677-803-1025	17.1 ppb
2016-07-05	1677-802-1115	ND
2016-10-06	1677-803-1105	10.00 ppb
2016-10-06	1677-801-0930	14.2 ppb
2016-10-06	1677-802-1015	ND
2017-01-04	1677-801-1335	ND
2017-01-04	1677-803-1150	11.8 ppb
2017-01-04	1677-802-1245	ND
2017-04-11	1677-802-1220	ND
2017-04-11	1677-801-1340	ND
2017-04-11	1677-803-1115	19.9 ppb
2017-04-27	1677-802-1020	ND
2017-04-27	1677-803-1005	16.6 ppb
2017-04-27	1677-801-1110	ND
2017-07-11	1677-801-1145	10.9 ppb
2017-07-11	1677-803-0948	13.2 ppb
2017-10-04	1677-802-1210	ND
2017-10-04	1677-801-1330	7.89 ppb
2017-10-04	1677-803-1035	13.5 ppb
2018-01-09	1677-803-0740	12.3 ppb
2018-01-09	1677-801-0930	ND
2018-01-09	1677-802-1015	ND
2018-04-09	1677-803-0930	17.8 ppb
2018-04-09	1677-801-0800	ND
2018-04-09	1677-802-0830	ND
2018-07-10	1677-803-0822	15.8 ppb
2018-07-10	1677-801-1220	8.00 ppb
2018-07-10	1677-802-1040	5.06 ppb
2018-10-01	1677-803-0740	13.4 ppb
2018-10-01	1677-801-1045	12.2 ppb
2018-10-01	1677-802-1120	ND
2019-10-03	1677-804-1215	10.4 ppb
2019-10-03	1677-801-1230	5.61 ppb
2019-10-03	1677-808-1105	11.6 ppb
2019-10-03	1677-806-1045	10.8 ppb
2019-10-03	1677-805-1055	11.5 ppb
2019-10-03	1677-803-1120	12.9 ppb
2019-10-03	1677-802-1155	12.7 ppb