Dichloroacetic acid

City of Watsonville

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)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	ND	32	0	ND
2015	0.241 ppb	32	6	ND - 1.40 ppb
2016	0.794 ppb	32	7	ND - 6.80 ppb
2017	3.88 ppb	32	13	ND - 15.0 ppb
2018	3.28 ppb	32	16	ND - 9.70 ppb
2019	3.84 ppb	32	18	ND - 12.0 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
2014-02-19	9590-801-1310	ND
2014-02-19	9590-802-1030	ND
2014-02-19	9590-803-0945	ND
2014-02-19	9590-804-1145	ND
2014-02-19	9590-805-0850	ND
2014-02-19	9590-806-1345	ND
2014-02-19	9590-807-1125	ND
2014-02-19	9590-808-0915	ND
2014-05-21	9590-801-1000	ND
2014-05-21	9590-802-0915	ND
2014-05-21	9590-803-0845	ND
2014-05-21	9590-804-0945	ND
2014-05-21	9590-805-0809	ND
2014-05-21	9590-806-1020	ND
2014-05-21	9590-807-0930	ND
2014-05-21	9590-808-0828	ND
2014-08-13	9590-801-1110	ND
2014-08-13	9590-802-0950	ND
2014-08-13	9590-803-0920	ND
2014-08-13	9590-804-1040	ND
2014-08-13	9590-805-0815	ND
2014-08-13	9590-806-1145	ND
2014-08-13	9590-807-1020	ND
2014-08-13	9590-808-0845	ND
2014-11-12	9590-801-1145	ND
2014-11-12	9590-802-1000	ND
2014-11-12	9590-803-0940	ND
2014-11-12	9590-804-1045	ND
2014-11-12	9590-805-0900	ND
2014-11-12	9590-806-1215	ND
2014-11-12	9590-807-1025	ND
2014-11-12	9590-808-0920	ND
2015-02-09	9590-801-1150	ND
2015-02-09	9590-802-1035	ND
2015-02-09	9590-803-1010	ND
2015-02-09	9590-804-1120	1.20 ppb
2015-02-09	9590-805-0920	ND
2015-02-09	9590-806-1210	ND
2015-02-09	9590-807-1100	1.30 ppb
2015-02-09	9590-808-0945	ND
2015-05-13	9590-801-1110	ND
2015-05-13	9590-802-1000	ND
2015-05-13	9590-803-0930	ND
2015-05-13	9590-804-1020	1.40 ppb
2015-05-13	9590-805-0830	ND
2015-05-13	9590-806-1135	ND
2015-05-13	9590-807-1050	1.40 ppb
2015-05-13	9590-808-0900	ND
2015-08-12	9590-801-1130	ND
2015-08-12	9590-802-1015	ND
2015-08-12	9590-803-0945	ND
2015-08-12	9590-804-1100	ND
2015-08-12	9590-805-0855	ND
2015-08-12	9590-806-1300	ND
2015-08-12	9590-807-1040	ND
2015-08-12	9590-808-0930	ND
2015-11-09	9590-801-1250	1.20 ppb
2015-11-09	9590-802-1130	1.20 ppb
2015-11-09	9590-803-1100	ND
2015-11-09	9590-804-1230	ND
2015-11-09	9590-805-1005	ND
2015-11-09	9590-806-1310	ND
2015-11-09	9590-807-1200	ND
2015-11-09	9590-808-1035	ND
2016-02-10	9590-801-1150	ND
2016-02-10	9590-802-1045	ND
2016-02-10	9590-803-1010	ND
2016-02-10	9590-804-1130	ND
2016-02-10	9590-805-0900	ND
2016-02-10	9590-806-1215	ND
2016-02-10	9590-807-1110	ND
2016-02-10	9590-808-0930	ND
2016-05-23	9590-801-1130	ND
2016-05-23	9590-802-1030	ND
2016-05-23	9590-803-0930	ND
2016-05-23	9590-804-1105	ND
2016-05-23	9590-805-0845	ND
2016-05-23	9590-806-1155	ND
2016-05-23	9590-807-1050	ND
2016-05-23	9590-808-0905	ND
2016-08-17	9590-801-1300	ND
2016-08-17	9590-802-1130	6.80 ppb
2016-08-17	9590-803-1030	3.20 ppb
2016-08-17	9590-804-1330	5.70 ppb
2016-08-17	9590-805-0915	ND
2016-08-17	9590-806-1350	2.30 ppb
2016-08-17	9590-807-1230	5.20 ppb
2016-08-17	9590-808-1000	1.000 ppb
2016-11-09	9590-801-1230	ND
2016-11-09	9590-802-1015	1.20 ppb
2016-11-09	9590-803-0950	ND
2016-11-09	9590-804-1200	ND
2016-11-09	9590-805-0905	ND
2016-11-09	9590-806-1250	ND
2016-11-09	9590-807-1050	ND
2016-11-09	9590-808-0930	ND
2017-02-27	9590-801-1215	ND
2017-02-27	9590-802-1015	ND
2017-02-27	9590-803-0945	ND
2017-02-27	9590-804-1115	ND
2017-02-27	9590-805-0845	ND
2017-02-27	9590-806-1235	ND
2017-02-27	9590-807-1045	ND
2017-02-27	9590-808-0915	ND
2017-05-31	9590-801-1130	ND
2017-05-31	9590-802-1025	ND
2017-05-31	9590-803-1000	ND
2017-05-31	9590-804-1110	ND
2017-05-31	9590-805-0900	ND
2017-05-31	9590-806-1150	ND
2017-05-31	9590-807-1050	ND
2017-05-31	9590-808-0935	ND
2017-08-16	9590-801-1255	ND
2017-08-16	9590-802-1150	13.0 ppb
2017-08-16	9590-803-1040	12.0 ppb
2017-08-16	9590-804-1220	3.70 ppb
2017-08-16	9590-805-0950	3.90 ppb
2017-08-16	9590-806-1330	ND
2017-08-16	9590-807-1240	8.70 ppb
2017-08-16	9590-808-1020	5.30 ppb
2017-11-14	9590-801-1200	11.0 ppb
2017-11-14	9590-802-1035	14.0 ppb
2017-11-14	9590-803-1010	15.0 ppb
2017-11-14	9590-804-1110	13.0 ppb
2017-11-14	9590-805-0920	ND
2017-11-14	9590-806-1230	5.70 ppb
2017-11-14	9590-807-1130	12.0 ppb
2017-11-14	9590-808-0950	6.90 ppb
2018-02-14	9590-801-1300	ND
2018-02-14	9590-802-1200	1.10 ppb
2018-02-14	9590-803-1140	ND
2018-02-14	9590-804-1240	ND
2018-02-14	9590-805-1100	ND
2018-02-14	9590-806-1315	ND
2018-02-14	9590-807-1220	ND
2018-02-14	9590-808-1120	1.000 ppb
2018-05-09	9590-801-1410	ND
2018-05-09	9590-802-1310	ND
2018-05-09	9590-803-1240	ND
2018-05-09	9590-804-1350	ND
2018-05-09	9590-805-1200	ND
2018-05-09	9590-806-1440	ND
2018-05-09	9590-807-1330	ND
2018-05-09	9590-808-1220	ND
2018-08-22	9590-801-1010	6.80 ppb
2018-08-22	9590-802-1040	8.30 ppb
2018-08-22	9590-803-1110	7.20 ppb
2018-08-22	9590-804-0920	9.00 ppb
2018-08-22	9590-805-1200	ND
2018-08-22	9590-806-0830	4.80 ppb
2018-08-22	9590-807-0945	9.00 ppb
2018-08-22	9590-808-1130	1.20 ppb
2018-11-13	9590-801-1210	8.20 ppb
2018-11-13	9590-802-1045	9.70 ppb
2018-11-13	9590-803-1015	8.40 ppb
2018-11-13	9590-804-1100	9.20 ppb
2018-11-13	9590-805-0930	ND
2018-11-13	9590-806-1230	7.90 ppb
2018-11-13	9590-807-1130	9.40 ppb
2018-11-13	9590-808-1000	3.70 ppb
2019-02-20	9590-801-1100	ND
2019-02-20	9590-802-0955	1.10 ppb
2019-02-20	9590-803-0935	ND
2019-02-20	9590-804-1040	1.40 ppb
2019-02-20	9590-805-0825	1.80 ppb
2019-02-20	9590-806-1125	ND
2019-02-20	9590-807-1020	1.60 ppb
2019-02-20	9590-808-0915	ND
2019-05-08	9590-801-1000	ND
2019-05-08	9590-802-0900	ND
2019-05-08	9590-803-0845	ND
2019-05-08	9590-804-0940	ND
2019-05-08	9590-805-0800	ND
2019-05-08	9590-806-1030	ND
2019-05-08	9590-807-0920	1.000 ppb
2019-05-08	9590-808-0820	ND
2019-08-14	9590-801-1230	7.80 ppb
2019-08-14	9590-802-1110	8.40 ppb
2019-08-14	9590-803-1040	10.00 ppb
2019-08-14	9590-804-1210	11.0 ppb
2019-08-14	9590-805-0945	ND
2019-08-14	9590-806-1250	8.60 ppb
2019-08-14	9590-807-1150	11.0 ppb
2019-08-14	9590-808-1010	1.40 ppb
2019-11-13	9590-801-1030	9.10 ppb
2019-11-13	9590-802-0915	12.0 ppb
2019-11-13	9590-803-0850	7.80 ppb
2019-11-13	9590-804-1015	10.00 ppb
2019-11-13	9590-805-0815	ND
2019-11-13	9590-806-1050	7.80 ppb
2019-11-13	9590-807-1000	11.0 ppb
2019-11-13	9590-808-0835	ND