Dichloroacetic acid

Goleta Water District

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

198

Samples

Samples exceeding legal limit (MCL)

142

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	5.69 ppb	35	30	ND - 11.0 ppb
2015	3.10 ppb	35	25	ND - 8.00 ppb
2016	1.45 ppb	32	11	ND - 8.60 ppb
2017	5.74 ppb	32	24	ND - 15.0 ppb
2018	5.11 ppb	32	21	ND - 13.0 ppb
2019	5.43 ppb	32	31	ND - 14.0 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
2014-02-12	9590-049-0959	10.00 ppb
2014-02-12	9590-050-0947	6.20 ppb
2014-02-12	9590-051-0838	8.80 ppb
2014-02-12	9590-052-0903	7.60 ppb
2014-02-12	9590-053-0928	10.00 ppb
2014-02-12	9590-054-0939	6.20 ppb
2014-02-12	9590-055-0915	11.0 ppb
2014-02-12	9590-056-0851	6.60 ppb
2014-05-14	9590-013-1120	1.40 ppb
2014-05-14	9590-049-1050	10.00 ppb
2014-05-14	9590-050-1005	5.80 ppb
2014-05-14	9590-051-0820	7.30 ppb
2014-05-14	9590-052-0855	9.00 ppb
2014-05-14	9590-053-0930	4.50 ppb
2014-05-14	9590-054-0950	8.00 ppb
2014-05-14	9590-055-0910	7.10 ppb
2014-05-14	9590-056-0840	7.20 ppb
2014-08-13	9590-013-1213	ND
2014-08-13	9590-049-1010	7.30 ppb
2014-08-13	9590-050-1035	3.90 ppb
2014-08-13	9590-051-0830	5.80 ppb
2014-08-13	9590-052-0915	8.20 ppb
2014-08-13	9590-053-1115	3.10 ppb
2014-08-13	9590-054-1055	6.60 ppb
2014-08-13	9590-055-1135	1.90 ppb
2014-08-13	9590-056-0850	5.30 ppb
2014-12-11	9590-013-1342	4.60 ppb
2014-12-11	9590-049-1245	7.80 ppb
2014-12-11	9590-050-1232	ND
2014-12-11	9590-051-1110	5.10 ppb
2014-12-11	9590-052-1132	6.50 ppb
2014-12-11	9590-053-1200	ND
2014-12-11	9590-054-1218	ND
2014-12-11	9590-055-1145	ND
2014-12-11	9590-056-1124	6.40 ppb
2015-02-11	9590-049-1035	2.90 ppb
2015-02-11	9590-050-1020	6.60 ppb
2015-02-11	9590-051-0815	4.10 ppb
2015-02-11	9590-052-0857	ND
2015-02-11	9590-053-0945	3.10 ppb
2015-02-11	9590-054-1000	ND
2015-02-11	9590-055-0926	ND
2015-02-11	9590-056-0840	7.10 ppb
2015-05-13	9590-013-1145	ND
2015-05-13	9590-049-1057	4.60 ppb
2015-05-13	9590-050-1112	1.20 ppb
2015-05-13	9590-051-0831	6.10 ppb
2015-05-13	9590-052-0909	8.00 ppb
2015-05-13	9590-053-1010	1.10 ppb
2015-05-13	9590-054-1037	1.60 ppb
2015-05-13	9590-055-0954	1.60 ppb
2015-05-13	9590-056-0853	5.80 ppb
2015-08-12	9590-013-0507	ND
2015-08-12	9590-049-0400	4.70 ppb
2015-08-12	9590-050-0431	4.00 ppb
2015-08-12	9590-051-0330	6.20 ppb
2015-08-12	9590-052-0305	5.70 ppb
2015-08-12	9590-053-0418	ND
2015-08-12	9590-054-0354	4.00 ppb
2015-08-12	9590-055-0324	3.30 ppb
2015-08-12	9590-056-0310	5.00 ppb
2015-12-09	9590-013-1136	ND
2015-12-09	9590-049-1101	5.20 ppb
2015-12-09	9590-050-1042	3.50 ppb
2015-12-09	9590-051-0803	3.90 ppb
2015-12-09	9590-052-0854	ND
2015-12-09	9590-053-0949	ND
2015-12-09	9590-054-1015	3.90 ppb
2015-12-09	9590-055-0922	ND
2015-12-09	9590-056-0834	5.20 ppb
2016-02-10	9590-049-1047	ND
2016-02-10	9590-050-1047	ND
2016-02-10	9590-051-0812	3.10 ppb
2016-02-10	9590-052-0908	ND
2016-02-10	9590-053-1133	ND
2016-02-10	9590-054-1110	ND
2016-02-10	9590-055-0939	ND
2016-02-10	9590-056-0841	5.50 ppb
2016-05-10	9590-049-1015	1.50 ppb
2016-05-10	9590-050-1030	ND
2016-05-10	9590-051-0815	4.70 ppb
2016-05-10	9590-052-0900	ND
2016-05-10	9590-053-0940	ND
2016-05-10	9590-054-1000	ND
2016-05-10	9590-055-0920	1.40 ppb
2016-05-10	9590-056-0845	7.70 ppb
2016-08-07	9590-049-0455	8.60 ppb
2016-08-07	9590-050-0522	4.60 ppb
2016-08-07	9590-051-0715	4.40 ppb
2016-08-07	9590-052-0645	ND
2016-08-07	9590-053-0410	ND
2016-08-07	9590-054-0545	3.30 ppb
2016-08-07	9590-055-0615	ND
2016-08-07	9590-056-0330	ND
2016-12-12	9590-049-0447	ND
2016-12-12	9590-050-0505	ND
2016-12-12	9590-051-0545	1.70 ppb
2016-12-12	9590-052-0322	ND
2016-12-12	9590-053-0403	ND
2016-12-12	9590-054-0520	ND
2016-12-12	9590-055-0344	ND
2016-12-12	9590-056-0258	ND
2017-02-16	9590-049-1030	ND
2017-02-16	9590-050-1050	ND
2017-02-16	9590-051-0848	2.20 ppb
2017-02-16	9590-052-0952	ND
2017-02-16	9590-053-1008	ND
2017-02-16	9590-054-1110	ND
2017-02-16	9590-055-0935	ND
2017-02-16	9590-056-0912	2.00 ppb
2017-05-13	9590-049-0630	1.40 ppb
2017-05-13	9590-050-0600	2.40 ppb
2017-05-13	9590-051-0348	6.70 ppb
2017-05-13	9590-052-0440	1.10 ppb
2017-05-13	9590-053-0518	ND
2017-05-13	9590-054-0540	2.60 ppb
2017-05-13	9590-055-0500	ND
2017-05-13	9590-056-0410	1.30 ppb
2017-08-09	9590-049-1218	14.0 ppb
2017-08-09	9590-050-1150	12.0 ppb
2017-08-09	9590-051-0912	10.00 ppb
2017-08-09	9590-052-1028	12.0 ppb
2017-08-09	9590-053-1100	10.00 ppb
2017-08-09	9590-054-1130	15.0 ppb
2017-08-09	9590-055-1041	12.0 ppb
2017-08-09	9590-056-0940	10.00 ppb
2017-12-13	9590-049-0850	8.60 ppb
2017-12-13	9590-050-0820	8.40 ppb
2017-12-13	9590-051-1005	10.00 ppb
2017-12-13	9590-052-0630	9.60 ppb
2017-12-13	9590-053-0720	8.00 ppb
2017-12-13	9590-054-0750	5.60 ppb
2017-12-13	9590-055-0652	9.70 ppb
2017-12-13	9590-056-0600	9.00 ppb
2018-02-14	9590-049-1100	ND
2018-02-14	9590-050-1135	ND
2018-02-14	9590-051-1245	1.10 ppb
2018-02-14	9590-052-0945	ND
2018-02-14	9590-053-1038	ND
2018-02-14	9590-054-1200	1.10 ppb
2018-02-14	9590-055-1010	ND
2018-02-14	9590-056-0905	ND
2018-05-08	9590-049-0230	1.40 ppb
2018-05-08	9590-050-0257	ND
2018-05-08	9590-051-0038	3.20 ppb
2018-05-08	9590-052-0100	ND
2018-05-08	9590-053-0155	ND
2018-05-08	9590-054-0318	ND
2018-05-08	9590-055-0130	ND
2018-05-08	9590-056-0010	1.40 ppb
2018-08-16	9590-049-0740	13.0 ppb
2018-08-16	9590-050-0810	8.20 ppb
2018-08-16	9590-051-0915	13.0 ppb
2018-08-16	9590-052-0615	8.60 ppb
2018-08-16	9590-053-0705	7.40 ppb
2018-08-16	9590-054-0840	13.0 ppb
2018-08-16	9590-055-0640	12.0 ppb
2018-08-16	9590-056-0555	12.0 ppb
2018-11-14	9590-049-0818	8.70 ppb
2018-11-14	9590-050-0840	7.90 ppb
2018-11-14	9590-051-0955	7.00 ppb
2018-11-14	9590-052-0648	7.20 ppb
2018-11-14	9590-053-0748	10.00 ppb
2018-11-14	9590-055-0718	9.60 ppb
2018-11-14	9590-056-0618	8.40 ppb
2018-12-07	9590-054-0855	9.40 ppb
2019-02-14	9590-049-0620	1.70 ppb
2019-02-14	9590-050-0639	1.90 ppb
2019-02-14	9590-051-0735	14.0 ppb
2019-02-14	9590-052-0514	1.80 ppb
2019-02-14	9590-053-0546	3.10 ppb
2019-02-14	9590-054-0702	1.50 ppb
2019-02-14	9590-055-0530	1.000 ppb
2019-02-14	9590-056-0501	11.0 ppb
2019-05-14	9590-049-0710	3.40 ppb
2019-05-14	9590-050-0730	2.00 ppb
2019-05-14	9590-051-0820	9.80 ppb
2019-05-14	9590-052-0600	1.40 ppb
2019-05-14	9590-053-0645	2.50 ppb
2019-05-14	9590-054-0750	3.40 ppb
2019-05-14	9590-055-0630	1.30 ppb
2019-05-14	9590-056-0535	2.70 ppb
2019-08-14	9590-049-0640	8.60 ppb
2019-08-14	9590-050-0715	8.80 ppb
2019-08-14	9590-051-0815	10.00 ppb
2019-08-14	9590-052-0445	11.0 ppb
2019-08-14	9590-053-0600	7.80 ppb
2019-08-14	9590-054-0748	8.70 ppb
2019-08-14	9590-055-0520	12.0 ppb
2019-08-14	9590-056-0855	11.0 ppb
2019-11-11	9590-049-0715	2.30 ppb
2019-11-11	9590-050-0745	8.20 ppb
2019-11-11	9590-051-0830	3.60 ppb
2019-11-11	9590-052-0540	ND
2019-11-11	9590-053-0640	7.00 ppb
2019-11-11	9590-054-0815	5.60 ppb
2019-11-11	9590-055-0610	1.30 ppb
2019-11-11	9590-056-0500	5.40 ppb