Dichloroacetic acid

City of Torrance Water Department

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

192

Samples

Samples exceeding legal limit (MCL)

178

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	4.15 ppb	32	28	ND - 11.4 ppb
2015	3.83 ppb	32	27	ND - 9.40 ppb
2016	4.32 ppb	32	32	1.000 ppb - 10.9 ppb
2017	5.00 ppb	32	32	1.20 ppb - 13.9 ppb
2018	2.42 ppb	32	30	ND - 4.30 ppb
2019	1.73 ppb	32	29	ND - 3.60 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
2014-03-04	3761-800-1058	ND
2014-03-04	3761-801-1215	3.00 ppb
2014-03-04	3761-802-1134	1.20 ppb
2014-03-04	3761-803-1112	1.20 ppb
2014-03-04	3761-804-1047	ND
2014-03-04	3761-805-1224	3.20 ppb
2014-03-04	3761-806-1034	2.90 ppb
2014-03-04	3761-807-1149	1.50 ppb
2014-06-05	3761-800-1050	ND
2014-06-05	3761-801-0905	10.6 ppb
2014-06-05	3761-802-0840	10.9 ppb
2014-06-05	3761-803-1035	1.10 ppb
2014-06-05	3761-804-1105	ND
2014-06-05	3761-805-1005	9.50 ppb
2014-06-05	3761-806-1120	6.50 ppb
2014-06-05	3761-807-0820	10.9 ppb
2014-09-11	3761-800-0900	1.90 ppb
2014-09-11	3761-801-1020	11.3 ppb
2014-09-11	3761-802-1230	9.00 ppb
2014-09-11	3761-803-0910	1.20 ppb
2014-09-11	3761-804-0920	1.10 ppb
2014-09-11	3761-805-1025	11.4 ppb
2014-09-11	3761-806-0950	11.2 ppb
2014-09-11	3761-807-1250	2.80 ppb
2014-12-09	3761-800-1025	2.90 ppb
2014-12-09	3761-801-0915	3.00 ppb
2014-12-09	3761-802-1020	2.00 ppb
2014-12-09	3761-803-1100	2.20 ppb
2014-12-09	3761-804-1040	2.40 ppb
2014-12-09	3761-805-0925	3.20 ppb
2014-12-09	3761-806-1300	2.60 ppb
2014-12-09	3761-807-1005	2.10 ppb
2015-03-23	3761-800-0955	6.70 ppb
2015-03-23	3761-801-1035	6.10 ppb
2015-03-23	3761-802-1400	5.60 ppb
2015-03-23	3761-803-0925	7.20 ppb
2015-03-23	3761-804-0935	7.10 ppb
2015-03-23	3761-805-1320	6.70 ppb
2015-03-23	3761-806-0945	7.10 ppb
2015-03-23	3761-807-1345	1.50 ppb
2015-06-18	3761-800-0910	ND
2015-06-18	3761-801-0955	4.30 ppb
2015-06-18	3761-802-1235	2.30 ppb
2015-06-18	3761-803-0915	ND
2015-06-18	3761-804-0925	ND
2015-06-18	3761-805-1000	4.50 ppb
2015-06-18	3761-806-0933	7.70 ppb
2015-06-18	3761-807-1023	1.70 ppb
2015-09-03	3761-800-0825	1.10 ppb
2015-09-03	3761-801-0925	8.50 ppb
2015-09-03	3761-802-1010	2.50 ppb
2015-09-03	3761-803-0840	ND
2015-09-03	3761-804-0847	ND
2015-09-03	3761-805-0930	9.40 ppb
2015-09-03	3761-806-0858	8.50 ppb
2015-09-03	3761-807-0955	2.10 ppb
2015-12-08	3761-800-0855	1.40 ppb
2015-12-08	3761-801-1007	4.60 ppb
2015-12-08	3761-802-1050	1.30 ppb
2015-12-08	3761-803-0905	1.10 ppb
2015-12-08	3761-804-0911	1.40 ppb
2015-12-08	3761-805-1015	4.90 ppb
2015-12-08	3761-806-0921	4.30 ppb
2015-12-08	3761-807-1035	2.90 ppb
2016-03-09	3761-800-0900	1.50 ppb
2016-03-09	3761-801-0947	1.30 ppb
2016-03-09	3761-802-1009	1.40 ppb
2016-03-09	3761-803-0910	1.000 ppb
2016-03-09	3761-804-0917	1.30 ppb
2016-03-09	3761-805-0953	1.30 ppb
2016-03-09	3761-806-0926	1.60 ppb
2016-03-09	3761-807-1040	1.10 ppb
2016-06-08	3761-800-0855	4.80 ppb
2016-06-08	3761-801-0942	5.20 ppb
2016-06-08	3761-802-1020	4.30 ppb
2016-06-08	3761-803-0905	4.90 ppb
2016-06-08	3761-804-0915	6.60 ppb
2016-06-08	3761-805-0950	7.40 ppb
2016-06-08	3761-806-0925	6.70 ppb
2016-06-08	3761-807-1035	7.00 ppb
2016-09-07	3761-800-0850	6.00 ppb
2016-09-07	3761-801-0950	2.50 ppb
2016-09-07	3761-802-1040	9.40 ppb
2016-09-07	3761-803-0900	5.60 ppb
2016-09-07	3761-804-0907	7.30 ppb
2016-09-07	3761-805-1000	4.70 ppb
2016-09-07	3761-806-0920	10.9 ppb
2016-09-07	3761-807-1026	10.1 ppb
2016-12-07	3761-800-0906	3.40 ppb
2016-12-07	3761-801-1010	3.70 ppb
2016-12-07	3761-802-1100	1.80 ppb
2016-12-07	3761-803-0915	2.90 ppb
2016-12-07	3761-804-0924	3.00 ppb
2016-12-07	3761-805-1015	4.00 ppb
2016-12-07	3761-806-0945	4.00 ppb
2016-12-07	3761-807-1035	1.40 ppb
2017-03-07	3761-800-0935	1.40 ppb
2017-03-07	3761-801-1030	10.2 ppb
2017-03-07	3761-802-1115	6.20 ppb
2017-03-07	3761-803-0945	1.30 ppb
2017-03-07	3761-804-1010	2.80 ppb
2017-03-07	3761-805-1040	13.9 ppb
2017-03-07	3761-806-1000	12.2 ppb
2017-03-07	3761-807-1100	5.00 ppb
2017-06-06	3761-800-0910	1.60 ppb
2017-06-06	3761-801-1003	11.2 ppb
2017-06-06	3761-802-1041	7.50 ppb
2017-06-06	3761-803-0920	2.00 ppb
2017-06-06	3761-804-0927	1.40 ppb
2017-06-06	3761-805-1009	11.0 ppb
2017-06-06	3761-806-0936	8.50 ppb
2017-06-06	3761-807-1029	9.50 ppb
2017-09-12	3761-800-0905	1.40 ppb
2017-09-12	3761-801-0958	9.50 ppb
2017-09-12	3761-802-1053	2.70 ppb
2017-09-12	3761-803-0915	1.60 ppb
2017-09-12	3761-804-0925	1.20 ppb
2017-09-12	3761-805-1005	8.00 ppb
2017-09-12	3761-806-0935	9.40 ppb
2017-09-12	3761-807-1027	1.50 ppb
2017-12-13	3761-800-0940	2.10 ppb
2017-12-13	3761-801-1027	3.10 ppb
2017-12-13	3761-802-1243	1.40 ppb
2017-12-13	3761-803-0949	1.40 ppb
2017-12-13	3761-804-1000	1.30 ppb
2017-12-13	3761-805-1033	3.20 ppb
2017-12-13	3761-806-1006	3.00 ppb
2017-12-13	3761-807-1300	3.60 ppb
2018-03-14	3761-800-1002	1.80 ppb
2018-03-14	3761-801-1135	3.90 ppb
2018-03-14	3761-802-1110	3.50 ppb
2018-03-14	3761-803-1013	ND
2018-03-14	3761-804-0951	1.80 ppb
2018-03-14	3761-805-1131	4.30 ppb
2018-03-14	3761-806-0937	2.10 ppb
2018-03-14	3761-807-1100	3.90 ppb
2018-06-27	3761-800-0805	2.10 ppb
2018-06-27	3761-801-0850	3.90 ppb
2018-06-27	3761-802-0949	3.10 ppb
2018-06-27	3761-803-0800	1.40 ppb
2018-06-27	3761-804-0815	2.40 ppb
2018-06-27	3761-805-0900	2.70 ppb
2018-06-27	3761-806-0825	4.10 ppb
2018-06-27	3761-807-0925	3.30 ppb
2018-09-17	3761-800-0805	1.30 ppb
2018-09-17	3761-801-0915	3.10 ppb
2018-09-17	3761-802-1025	2.80 ppb
2018-09-17	3761-803-0730	ND
2018-09-17	3761-804-0815	1.80 ppb
2018-09-17	3761-805-0925	3.10 ppb
2018-09-17	3761-806-0825	2.80 ppb
2018-09-17	3761-807-1010	2.20 ppb
2018-12-04	3761-800-0925	2.20 ppb
2018-12-04	3761-801-0845	2.60 ppb
2018-12-04	3761-802-0815	1.80 ppb
2018-12-04	3761-803-0950	1.20 ppb
2018-12-04	3761-804-0920	1.70 ppb
2018-12-04	3761-805-0835	2.60 ppb
2018-12-04	3761-806-0910	1.80 ppb
2018-12-04	3761-807-0800	2.00 ppb
2019-03-20	3761-800-0825	2.10 ppb
2019-03-20	3761-801-0905	1.80 ppb
2019-03-20	3761-802-1000	1.50 ppb
2019-03-20	3761-803-0745	1.30 ppb
2019-03-20	3761-804-0800	1.50 ppb
2019-03-20	3761-805-0915	1.50 ppb
2019-03-20	3761-806-0810	2.70 ppb
2019-03-20	3761-807-0945	3.30 ppb
2019-06-25	3761-800-0820	1.80 ppb
2019-06-25	3761-801-0910	1.80 ppb
2019-06-25	3761-802-0950	3.60 ppb
2019-06-25	3761-803-0810	1.20 ppb
2019-06-25	3761-804-0830	1.30 ppb
2019-06-25	3761-805-0900	3.40 ppb
2019-06-25	3761-806-0840	2.20 ppb
2019-06-25	3761-807-0930	1.40 ppb
2019-09-18	3761-800-0745	1.20 ppb
2019-09-18	3761-801-0830	1.70 ppb
2019-09-18	3761-802-0930	1.80 ppb
2019-09-18	3761-803-0735	ND
2019-09-18	3761-804-0755	1.20 ppb
2019-09-18	3761-805-0840	1.70 ppb
2019-09-18	3761-806-0805	1.70 ppb
2019-09-18	3761-807-0911	1.10 ppb
2019-12-11	3761-800-0800	1.10 ppb
2019-12-11	3761-801-0845	2.40 ppb
2019-12-11	3761-802-0940	2.30 ppb
2019-12-11	3761-803-0745	ND
2019-12-11	3761-804-0810	ND
2019-12-11	3761-805-0855	2.60 ppb
2019-12-11	3761-806-0825	1.60 ppb
2019-12-11	3761-807-0925	2.70 ppb