Dichloroacetic acid

City of San Juan Capistrano

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

193

Samples

Samples exceeding legal limit (MCL)

128

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	3.15 ppb	32	22	ND - 7.50 ppb
2015	2.07 ppb	32	21	ND - 7.20 ppb
2016	1.00 ppb	32	19	ND - 2.50 ppb
2017	1.84 ppb	32	19	ND - 5.00 ppb
2018	1.85 ppb	32	22	ND - 4.50 ppb
2019	4.09 ppb	33	25	ND - 16.0 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
2014-02-10	9590-801-0727	5.20 ppb
2014-02-10	9590-802-1231	ND
2014-02-10	9590-803-0748	5.30 ppb
2014-02-10	9590-804-0858	2.40 ppb
2014-02-10	9590-805-1309	ND
2014-02-10	9590-806-1150	ND
2014-02-10	9590-807-1120	ND
2014-02-10	9590-808-1107	ND
2014-05-12	9590-801-0808	6.10 ppb
2014-05-12	9590-802-0833	6.50 ppb
2014-05-12	9590-803-0819	ND
2014-05-12	9590-804-0939	4.70 ppb
2014-05-12	9590-805-1032	ND
2014-05-12	9590-806-1159	ND
2014-05-12	9590-807-1101	ND
2014-05-12	9590-808-1114	3.80 ppb
2014-08-11	9590-801-0738	4.40 ppb
2014-08-11	9590-802-0833	4.90 ppb
2014-08-11	9590-803-0815	5.20 ppb
2014-08-11	9590-804-0848	6.30 ppb
2014-08-11	9590-805-1121	1.70 ppb
2014-08-11	9590-806-1029	6.80 ppb
2014-08-11	9590-807-0959	7.50 ppb
2014-08-11	9590-808-0947	7.20 ppb
2014-11-10	9590-801-0645	4.10 ppb
2014-11-10	9590-802-1512	4.00 ppb
2014-11-10	9590-803-1450	3.80 ppb
2014-11-10	9590-804-0815	4.20 ppb
2014-11-10	9590-805-1340	ND
2014-11-10	9590-806-1410	2.60 ppb
2014-11-10	9590-807-1000	1.70 ppb
2014-11-10	9590-808-1430	2.50 ppb
2015-02-09	9590-801-1407	3.40 ppb
2015-02-09	9590-802-1000	4.20 ppb
2015-02-09	9590-803-1430	3.80 ppb
2015-02-09	9590-804-1020	3.60 ppb
2015-02-09	9590-805-1146	1.10 ppb
2015-02-09	9590-806-1120	ND
2015-02-09	9590-807-1100	ND
2015-02-09	9590-808-1045	ND
2015-05-11	9590-801-0901	4.90 ppb
2015-05-11	9590-802-1500	5.30 ppb
2015-05-11	9590-803-1440	5.90 ppb
2015-05-11	9590-804-0937	4.40 ppb
2015-05-11	9590-805-1352	2.90 ppb
2015-05-11	9590-806-1227	1.50 ppb
2015-05-11	9590-807-1140	ND
2015-05-11	9590-808-1123	1.30 ppb
2015-08-10	9590-801-0827	3.80 ppb
2015-08-10	9590-802-0839	7.20 ppb
2015-08-10	9590-803-0850	ND
2015-08-10	9590-804-0918	2.10 ppb
2015-08-10	9590-805-1208	ND
2015-08-10	9590-806-1057	ND
2015-08-10	9590-807-1025	3.00 ppb
2015-08-10	9590-808-1015	ND
2015-11-11	9590-801-0818	1.40 ppb
2015-11-11	9590-802-0750	1.60 ppb
2015-11-11	9590-803-0720	1.60 ppb
2015-11-11	9590-804-0844	1.70 ppb
2015-11-11	9590-805-1113	ND
2015-11-11	9590-806-1045	ND
2015-11-11	9590-807-1028	ND
2015-11-11	9590-808-1008	1.60 ppb
2016-02-03	9590-801-1150	1.40 ppb
2016-02-03	9590-802-0806	1.80 ppb
2016-02-03	9590-803-0752	1.40 ppb
2016-02-03	9590-804-0858	1.30 ppb
2016-02-03	9590-805-1131	ND
2016-02-03	9590-806-1051	ND
2016-02-03	9590-807-1017	ND
2016-02-03	9590-808-1006	1.60 ppb
2016-05-10	9590-801-0747	1.40 ppb
2016-05-10	9590-802-0759	1.50 ppb
2016-05-10	9590-803-0809	1.50 ppb
2016-05-10	9590-804-0830	1.20 ppb
2016-05-10	9590-805-1100	ND
2016-05-10	9590-806-1010	ND
2016-05-10	9590-807-0932	ND
2016-05-10	9590-808-0920	ND
2016-08-09	9590-801-0703	1.40 ppb
2016-08-09	9590-802-0719	1.80 ppb
2016-08-09	9590-803-0730	1.70 ppb
2016-08-09	9590-804-0755	1.50 ppb
2016-08-09	9590-805-1002	ND
2016-08-09	9590-806-0912	ND
2016-08-09	9590-807-0843	ND
2016-08-09	9590-808-1019	ND
2016-11-16	9590-801-0753	1.80 ppb
2016-11-16	9590-802-0815	1.80 ppb
2016-11-16	9590-803-0836	1.80 ppb
2016-11-16	9590-804-0903	ND
2016-11-16	9590-805-1058	ND
2016-11-16	9590-806-1020	2.50 ppb
2016-11-16	9590-807-0951	2.20 ppb
2016-11-16	9590-808-0926	2.50 ppb
2017-02-18	9590-801-0925	4.90 ppb
2017-02-18	9590-802-0740	4.40 ppb
2017-02-18	9590-803-0802	5.00 ppb
2017-02-18	9590-804-0822	ND
2017-02-18	9590-805-1030	1.90 ppb
2017-02-18	9590-806-1009	1.10 ppb
2017-02-18	9590-807-0945	ND
2017-02-18	9590-808-0903	1.50 ppb
2017-05-09	9590-801-0831	5.00 ppb
2017-05-09	9590-802-0850	4.70 ppb
2017-05-09	9590-803-0906	4.40 ppb
2017-05-09	9590-804-0933	3.70 ppb
2017-05-09	9590-805-1234	1.30 ppb
2017-05-09	9590-806-1132	3.00 ppb
2017-05-09	9590-807-1047	2.30 ppb
2017-05-09	9590-808-1032	ND
2017-08-14	9590-801-0747	3.00 ppb
2017-08-14	9590-802-0812	3.20 ppb
2017-08-14	9590-803-0836	3.10 ppb
2017-08-14	9590-804-0931	ND
2017-08-14	9590-805-1104	ND
2017-08-14	9590-806-0845	ND
2017-08-14	9590-807-0810	ND
2017-08-14	9590-808-1054	ND
2017-11-14	9590-801-0743	2.00 ppb
2017-11-14	9590-802-0809	2.30 ppb
2017-11-14	9590-803-0830	2.20 ppb
2017-11-14	9590-804-0913	ND
2017-11-14	9590-805-1250	ND
2017-11-14	9590-806-1127	ND
2017-11-14	9590-807-1056	ND
2017-11-14	9590-808-1030	ND
2018-02-14	9590-801-0737	2.90 ppb
2018-02-14	9590-802-0815	3.10 ppb
2018-02-14	9590-803-0837	3.20 ppb
2018-02-14	9590-804-0900	ND
2018-02-14	9590-805-1047	ND
2018-02-14	9590-806-1018	3.00 ppb
2018-02-14	9590-807-0949	2.40 ppb
2018-02-14	9590-808-0929	3.40 ppb
2018-05-15	9590-801-0825	2.20 ppb
2018-05-15	9590-802-0847	2.50 ppb
2018-05-15	9590-803-0910	2.40 ppb
2018-05-15	9590-804-0950	2.30 ppb
2018-05-15	9590-805-1319	ND
2018-05-15	9590-806-1153	2.20 ppb
2018-05-15	9590-807-1124	2.10 ppb
2018-05-15	9590-808-1058	2.30 ppb
2018-08-14	9590-801-0803	2.80 ppb
2018-08-14	9590-802-0830	2.90 ppb
2018-08-14	9590-803-0848	2.80 ppb
2018-08-14	9590-804-0930	ND
2018-08-14	9590-805-1254	ND
2018-08-14	9590-806-1127	ND
2018-08-14	9590-807-1058	ND
2018-08-14	9590-808-1038	ND
2018-11-13	9590-801-0912	2.80 ppb
2018-11-13	9590-802-0939	4.30 ppb
2018-11-13	9590-803-1002	4.50 ppb
2018-11-13	9590-804-1021	2.30 ppb
2018-11-13	9590-805-1200	ND
2018-11-13	9590-806-1130	1.20 ppb
2018-11-13	9590-807-1107	ND
2018-11-13	9590-808-1043	1.60 ppb
2019-02-12	5867-801-1415	ND
2019-02-12	5867-805-0755	ND
2019-02-12	5867-806-0930	ND
2019-02-12	5867-808-1015	1.000 ppb
2019-02-20	5867-801-1115	3.00 ppb
2019-02-20	5867-802-1100	3.00 ppb
2019-02-20	5867-803-1040	2.00 ppb
2019-02-20	5867-804-0854	ND
2019-02-20	5867-807-1055	ND
2019-05-14	5867-805-0735	1.000 ppb
2019-05-14	5867-806-0815	3.00 ppb
2019-05-14	5867-807-1515	3.00 ppb
2019-05-15	5867-801-1020	4.00 ppb
2019-05-15	5867-802-1010	4.00 ppb
2019-05-15	5867-803-0940	5.00 ppb
2019-05-15	5867-804-0855	4.00 ppb
2019-05-15	5867-808-0830	3.00 ppb
2019-08-13	5867-801-0920	6.00 ppb
2019-08-13	5867-802-0840	6.00 ppb
2019-08-13	5867-803-1005	6.00 ppb
2019-08-13	5867-804-0825	ND
2019-08-13	5867-805-1325	ND
2019-08-13	5867-806-1235	5.00 ppb
2019-08-13	5867-807-1200	5.00 ppb
2019-08-13	5867-808-1130	ND
2019-11-19	5867-801-1110	6.00 ppb
2019-11-19	5867-802-1045	7.00 ppb
2019-11-19	5867-803-1025	6.00 ppb
2019-11-19	5867-804-0945	10.00 ppb
2019-11-19	5867-805-0805	1.000 ppb
2019-11-19	5867-806-0845	16.0 ppb
2019-11-19	5867-807-0905	13.0 ppb
2019-11-19	5867-808-0925	12.0 ppb