Dichloroacetic acid

City of Orange

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

176

Samples

Samples exceeding legal limit (MCL)

117

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	5.28 ppb	16	13	ND - 10.8 ppb
2015	3.33 ppb	32	24	ND - 9.40 ppb
2016	0.900 ppb	32	14	ND - 4.60 ppb
2017	1.73 ppb	32	23	ND - 7.70 ppb
2018	1.52 ppb	32	23	ND - 4.60 ppb
2019	1.64 ppb	32	20	ND - 5.90 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
2014-02-12	3761-801-1021	ND
2014-02-12	3761-802-1002	ND
2014-02-12	3761-803-0912	5.30 ppb
2014-02-12	3761-804-0924	4.60 ppb
2014-02-12	3761-805-0945	3.10 ppb
2014-02-12	3761-806-0936	4.90 ppb
2014-02-12	3761-807-0900	6.40 ppb
2014-02-12	3761-808-1040	ND
2014-08-13	3761-801-0907	7.90 ppb
2014-08-13	3761-802-0853	5.90 ppb
2014-08-13	3761-803-0801	8.00 ppb
2014-08-13	3761-804-0811	10.1 ppb
2014-08-13	3761-805-0838	9.00 ppb
2014-08-13	3761-806-0822	6.60 ppb
2014-08-13	3761-807-0748	10.8 ppb
2014-08-13	3761-808-0920	1.90 ppb
2015-02-05	3761-801-1037	ND
2015-02-05	3761-802-1112	ND
2015-02-05	3761-803-0937	4.60 ppb
2015-02-05	3761-804-0945	5.10 ppb
2015-02-05	3761-805-1011	4.30 ppb
2015-02-05	3761-806-0956	5.30 ppb
2015-02-05	3761-807-0921	5.30 ppb
2015-02-05	3761-808-1056	ND
2015-05-20	3761-801-0945	ND
2015-05-20	3761-802-0933	ND
2015-05-20	3761-803-0833	7.90 ppb
2015-05-20	3761-804-0840	7.30 ppb
2015-05-20	3761-805-0918	2.10 ppb
2015-05-20	3761-806-0904	6.90 ppb
2015-05-20	3761-807-0820	9.40 ppb
2015-05-20	3761-808-1003	ND
2015-08-13	3761-801-1120	1.40 ppb
2015-08-13	3761-802-1100	1.20 ppb
2015-08-13	3761-803-1011	6.40 ppb
2015-08-13	3761-804-1020	9.10 ppb
2015-08-13	3761-805-1050	1.50 ppb
2015-08-13	3761-806-1031	8.70 ppb
2015-08-13	3761-807-0958	5.40 ppb
2015-08-13	3761-808-1130	2.10 ppb
2015-11-18	3761-801-1102	ND
2015-11-18	3761-802-1050	ND
2015-11-18	3761-803-1009	2.00 ppb
2015-11-18	3761-804-1018	2.00 ppb
2015-11-18	3761-805-1038	1.30 ppb
2015-11-18	3761-806-1027	2.00 ppb
2015-11-18	3761-807-0958	3.70 ppb
2015-11-18	3761-808-1112	1.70 ppb
2016-02-18	3761-801-0930	1.30 ppb
2016-02-18	3761-802-0913	ND
2016-02-18	3761-803-0822	ND
2016-02-18	3761-804-0833	ND
2016-02-18	3761-805-0858	ND
2016-02-18	3761-806-0844	ND
2016-02-18	3761-807-0812	2.60 ppb
2016-02-18	3761-808-0942	1.50 ppb
2016-05-18	3761-801-1042	ND
2016-05-18	3761-802-1029	ND
2016-05-18	3761-803-0922	1.80 ppb
2016-05-18	3761-804-0929	2.00 ppb
2016-05-18	3761-805-1018	ND
2016-05-18	3761-806-1000	1.70 ppb
2016-05-18	3761-807-0914	4.60 ppb
2016-05-18	3761-808-1051	1.000 ppb
2016-08-17	3761-801-0916	ND
2016-08-17	3761-802-0903	ND
2016-08-17	3761-803-0802	2.10 ppb
2016-08-17	3761-804-0810	2.10 ppb
2016-08-17	3761-805-0837	1.50 ppb
2016-08-17	3761-806-0822	1.80 ppb
2016-08-17	3761-807-0750	3.60 ppb
2016-08-17	3761-808-0927	ND
2016-11-16	3761-801-0956	ND
2016-11-16	3761-802-0946	ND
2016-11-16	3761-803-0901	ND
2016-11-16	3761-804-0910	ND
2016-11-16	3761-805-0932	ND
2016-11-16	3761-806-0922	ND
2016-11-16	3761-807-0850	1.20 ppb
2016-11-16	3761-808-1008	ND
2017-02-15	3761-801-1009	1.90 ppb
2017-02-15	3761-802-0958	1.40 ppb
2017-02-15	3761-803-0920	1.000 ppb
2017-02-15	3761-804-0926	ND
2017-02-15	3761-805-0947	1.10 ppb
2017-02-15	3761-806-0936	ND
2017-02-15	3761-807-0911	3.20 ppb
2017-02-15	3761-808-1035	ND
2017-05-10	3761-801-0924	2.00 ppb
2017-05-10	3761-802-0912	ND
2017-05-10	3761-803-0808	ND
2017-05-10	3761-804-0818	ND
2017-05-10	3761-805-0900	ND
2017-05-10	3761-806-0830	ND
2017-05-10	3761-807-0759	2.50 ppb
2017-05-10	3761-808-0939	1.60 ppb
2017-08-17	3761-801-1010	1.10 ppb
2017-08-17	3761-802-1000	ND
2017-08-17	3761-803-0925	3.10 ppb
2017-08-17	3761-804-0932	3.00 ppb
2017-08-17	3761-805-0950	1.000 ppb
2017-08-17	3761-806-0939	2.50 ppb
2017-08-17	3761-807-0915	7.70 ppb
2017-08-17	3761-808-1020	2.10 ppb
2017-11-29	3761-801-1004	1.30 ppb
2017-11-29	3761-802-0952	1.10 ppb
2017-11-29	3761-803-0909	1.50 ppb
2017-11-29	3761-804-0916	1.80 ppb
2017-11-29	3761-805-0941	1.000 ppb
2017-11-29	3761-806-0927	1.30 ppb
2017-11-29	3761-807-0855	4.90 ppb
2017-11-29	3761-808-1015	7.20 ppb
2018-02-15	3761-801-0957	1.70 ppb
2018-02-15	3761-802-0946	1.10 ppb
2018-02-15	3761-803-0904	2.30 ppb
2018-02-15	3761-804-0911	2.20 ppb
2018-02-15	3761-805-0934	1.20 ppb
2018-02-15	3761-806-0922	2.30 ppb
2018-02-15	3761-807-0850	2.90 ppb
2018-02-15	3761-808-1005	1.80 ppb
2018-05-16	3761-801-0940	1.000 ppb
2018-05-16	3761-802-0927	ND
2018-05-16	3761-803-0852	1.70 ppb
2018-05-16	3761-804-0857	ND
2018-05-16	3761-805-0918	1.70 ppb
2018-05-16	3761-806-0904	ND
2018-05-16	3761-807-0844	2.20 ppb
2018-05-16	3761-808-0948	ND
2018-08-15	3761-801-0949	1.90 ppb
2018-08-15	3761-802-0940	ND
2018-08-15	3761-803-0902	2.60 ppb
2018-08-15	3761-804-0911	2.70 ppb
2018-08-15	3761-805-0929	2.70 ppb
2018-08-15	3761-806-0915	2.50 ppb
2018-08-15	3761-807-0854	1.20 ppb
2018-08-15	3761-808-0958	4.60 ppb
2018-11-15	3761-801-1114	ND
2018-11-15	3761-802-1105	ND
2018-11-15	3761-803-1034	2.20 ppb
2018-11-15	3761-804-1039	2.30 ppb
2018-11-15	3761-805-1054	ND
2018-11-15	3761-806-1045	2.20 ppb
2018-11-15	3761-807-1027	1.50 ppb
2018-11-15	3761-808-1122	ND
2019-02-20	3761-801-1040	1.000 ppb
2019-02-20	3761-802-1031	ND
2019-02-20	3761-803-0958	3.80 ppb
2019-02-20	3761-804-1003	ND
2019-02-20	3761-805-1020	ND
2019-02-20	3761-806-1011	ND
2019-02-20	3761-807-0951	3.10 ppb
2019-02-20	3761-808-1047	2.70 ppb
2019-05-15	3761-801-1009	ND
2019-05-15	3761-802-1000	ND
2019-05-15	3761-803-0928	2.80 ppb
2019-05-15	3761-804-0934	2.70 ppb
2019-05-15	3761-805-0951	1.70 ppb
2019-05-15	3761-806-0941	2.60 ppb
2019-05-15	3761-807-0917	5.90 ppb
2019-05-15	3761-808-1016	ND
2019-08-14	3761-801-1010	ND
2019-08-14	3761-802-1001	ND
2019-08-14	3761-803-0925	2.80 ppb
2019-08-14	3761-804-0932	3.10 ppb
2019-08-14	3761-805-0949	1.50 ppb
2019-08-14	3761-806-0940	2.20 ppb
2019-08-14	3761-807-0917	2.00 ppb
2019-08-14	3761-808-1017	ND
2019-11-22	3761-801-0926	1.80 ppb
2019-11-22	3761-802-0917	ND
2019-11-22	3761-803-0844	2.80 ppb
2019-11-22	3761-804-0850	3.90 ppb
2019-11-22	3761-805-0907	2.00 ppb
2019-11-22	3761-806-0857	ND
2019-11-22	3761-807-0838	3.00 ppb
2019-11-22	3761-808-0933	1.10 ppb