Dichloroacetic acid

City of San Jose - EVG/EDV/COY

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)

115

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	0.500 ppb	32	7	ND - 3.10 ppb
2015	0.806 ppb	32	13	ND - 2.60 ppb
2016	2.40 ppb	32	18	ND - 8.70 ppb
2017	2.94 ppb	32	26	ND - 7.00 ppb
2018	2.38 ppb	32	28	ND - 8.40 ppb
2019	2.04 ppb	32	23	ND - 9.00 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
2014-01-14	9590-900-0805	ND
2014-01-14	9590-901-0845	ND
2014-01-14	9590-902-1055	ND
2014-01-14	9590-903-0942	ND
2014-01-14	9590-904-1118	ND
2014-01-14	9590-905-1033	ND
2014-01-14	9590-906-0915	ND
2014-01-14	9590-907-1006	ND
2014-04-08	1610-900-1118	ND
2014-04-08	1610-901-1047	ND
2014-04-08	1610-902-0835	ND
2014-04-08	1610-903-0955	ND
2014-04-08	1610-904-0815	ND
2014-04-08	1610-905-0856	ND
2014-04-08	1610-906-1024	ND
2014-04-08	1610-907-0925	ND
2014-07-08	1610-900-1137	ND
2014-07-08	1610-901-1120	ND
2014-07-08	1610-902-0904	2.10 ppb
2014-07-08	1610-903-0950	ND
2014-07-08	1610-904-0843	2.00 ppb
2014-07-08	1610-905-0925	1.60 ppb
2014-07-08	1610-906-1059	ND
2014-07-08	1610-907-1015	1.60 ppb
2014-10-14	1610-900-0805	ND
2014-10-14	1610-901-0855	ND
2014-10-14	1610-902-1102	2.70 ppb
2014-10-14	1610-903-0930	ND
2014-10-14	1610-904-1120	3.10 ppb
2014-10-14	1610-905-1040	ND
2014-10-14	1610-906-1015	ND
2014-10-14	1610-907-0950	2.90 ppb
2015-01-13	1610-900-1105	ND
2015-01-13	1610-901-1042	ND
2015-01-13	1610-902-0840	2.40 ppb
2015-01-13	1610-903-0946	ND
2015-01-13	1610-904-0818	2.40 ppb
2015-01-13	1610-905-0900	ND
2015-01-13	1610-906-1016	1.60 ppb
2015-01-13	1610-907-0926	ND
2015-04-14	1610-900-1129	1.50 ppb
2015-04-14	1610-901-1050	ND
2015-04-14	1610-902-0810	1.90 ppb
2015-04-14	1610-903-1025	ND
2015-04-14	1610-904-0845	2.20 ppb
2015-04-14	1610-905-0935	2.10 ppb
2015-04-14	1610-906-1110	1.60 ppb
2015-04-14	1610-907-0956	1.70 ppb
2015-07-14	1610-900-1040	ND
2015-07-14	1610-901-1110	ND
2015-07-14	1610-902-0835	2.20 ppb
2015-07-14	1610-903-0925	ND
2015-07-14	1610-904-0810	2.60 ppb
2015-07-14	1610-905-0855	ND
2015-07-14	1610-906-1015	ND
2015-07-14	1610-907-0940	ND
2015-10-13	1610-900-1020	ND
2015-10-13	1610-901-0904	ND
2015-10-13	1610-902-1200	ND
2015-10-13	1610-903-0944	ND
2015-10-13	1610-904-1218	2.20 ppb
2015-10-13	1610-905-1135	ND
2015-10-13	1610-906-0830	ND
2015-10-13	1610-907-1053	1.40 ppb
2016-01-12	1610-900-0905	ND
2016-01-12	1610-901-0840	ND
2016-01-12	1610-902-1059	ND
2016-01-12	1610-903-0807	ND
2016-01-12	1610-904-1122	ND
2016-01-12	1610-905-1030	ND
2016-01-12	1610-906-0942	ND
2016-01-12	1610-907-1010	ND
2016-04-12	1610-004-1200	7.00 ppb
2016-04-12	1610-900-1049	7.00 ppb
2016-04-12	1610-901-1026	2.10 ppb
2016-04-12	1610-902-1144	8.70 ppb
2016-04-12	1610-903-0930	2.10 ppb
2016-04-12	1610-905-1124	8.20 ppb
2016-04-12	1610-906-0903	2.50 ppb
2016-04-12	1610-907-0954	6.80 ppb
2016-07-12	1610-900-0820	4.30 ppb
2016-07-12	1610-901-0853	2.90 ppb
2016-07-12	1610-902-1133	4.50 ppb
2016-07-12	1610-903-1015	1.60 ppb
2016-07-12	1610-904-1156	4.40 ppb
2016-07-12	1610-905-1110	4.30 ppb
2016-07-12	1610-906-0921	3.00 ppb
2016-07-12	1610-907-1042	4.60 ppb
2016-10-11	1610-900-1256	1.20 ppb
2016-10-11	1610-901-1236	ND
2016-10-11	1610-902-1036	ND
2016-10-11	1610-903-1148	ND
2016-10-11	1610-904-1007	ND
2016-10-11	1610-905-1107	ND
2016-10-11	1610-906-1217	ND
2016-10-11	1610-907-1126	1.60 ppb
2017-01-10	1610-900-0945	1.70 ppb
2017-01-10	1610-901-0922	ND
2017-01-10	1610-902-1040	ND
2017-01-10	1610-903-0801	ND
2017-01-10	1610-904-1109	2.80 ppb
2017-01-10	1610-905-1013	1.80 ppb
2017-01-10	1610-906-0821	ND
2017-01-10	1610-907-0854	3.10 ppb
2017-04-11	1610-900-0825	2.20 ppb
2017-04-11	1610-901-0850	1.80 ppb
2017-04-11	1610-902-0946	2.20 ppb
2017-04-11	1610-903-1125	ND
2017-04-11	1610-904-1010	1.80 ppb
2017-04-11	1610-905-1035	2.30 ppb
2017-04-11	1610-906-0915	ND
2017-04-11	1610-907-1058	1.80 ppb
2017-07-11	1610-900-0847	5.40 ppb
2017-07-11	1610-901-0933	2.10 ppb
2017-07-11	1610-902-1114	6.10 ppb
2017-07-11	1610-903-1018	2.80 ppb
2017-07-11	1610-904-1126	7.00 ppb
2017-07-11	1610-905-1100	6.40 ppb
2017-07-11	1610-906-0958	2.20 ppb
2017-07-11	1610-907-1044	6.50 ppb
2017-10-11	1610-900-0810	5.10 ppb
2017-10-11	1610-901-0839	2.60 ppb
2017-10-11	1610-902-1110	4.90 ppb
2017-10-11	1610-903-0935	3.80 ppb
2017-10-11	1610-904-1131	5.00 ppb
2017-10-11	1610-905-1045	4.10 ppb
2017-10-11	1610-906-0910	3.10 ppb
2017-10-11	1610-907-1005	5.40 ppb
2018-01-09	1610-900-1250	6.70 ppb
2018-01-09	1610-901-1221	8.40 ppb
2018-01-09	1610-902-0842	4.30 ppb
2018-01-09	1610-903-1116	2.30 ppb
2018-01-09	1610-904-0925	4.30 ppb
2018-01-09	1610-905-1000	6.20 ppb
2018-01-09	1610-906-1151	3.50 ppb
2018-01-09	1610-907-1041	4.30 ppb
2018-04-09	1610-900-0856	2.40 ppb
2018-04-09	1610-901-0919	3.00 ppb
2018-04-09	1610-902-1100	2.40 ppb
2018-04-09	1610-903-1001	1.000 ppb
2018-04-09	1610-904-1120	1.80 ppb
2018-04-09	1610-905-1041	2.50 ppb
2018-04-09	1610-906-0941	1.60 ppb
2018-04-09	1610-907-1020	2.50 ppb
2018-07-10	1610-900-1027	1.70 ppb
2018-07-10	1610-901-1008	1.70 ppb
2018-07-10	1610-902-0816	1.70 ppb
2018-07-10	1610-903-0925	1.50 ppb
2018-07-10	1610-904-0800	ND
2018-07-10	1610-905-0851	1.000 ppb
2018-07-10	1610-906-0948	ND
2018-07-10	1610-907-0906	1.70 ppb
2018-10-09	1610-900-1033	1.80 ppb
2018-10-09	1610-901-1001	1.50 ppb
2018-10-09	1610-902-0816	1.60 ppb
2018-10-09	1610-903-0919	ND
2018-10-09	1610-904-0830	1.90 ppb
2018-10-09	1610-905-0850	1.10 ppb
2018-10-09	1610-906-0943	ND
2018-10-09	1610-907-0905	1.80 ppb
2019-01-08	1610-900-0837	ND
2019-01-08	1610-901-0900	ND
2019-01-08	1610-902-0940	1.10 ppb
2019-01-08	1610-903-1058	ND
2019-01-08	1610-904-1002	ND
2019-01-08	1610-905-1142	9.00 ppb
2019-01-08	1610-906-1029	ND
2019-01-08	1610-907-1118	ND
2019-04-09	1610-900-1102	2.90 ppb
2019-04-09	1610-901-0816	1.60 ppb
2019-04-09	1610-902-1018	4.00 ppb
2019-04-09	1610-903-0921	1.20 ppb
2019-04-09	1610-904-1038	1.40 ppb
2019-04-09	1610-905-0959	5.00 ppb
2019-04-09	1610-906-0841	1.70 ppb
2019-04-09	1610-907-0940	1.90 ppb
2019-07-09	1610-900-0800	1.10 ppb
2019-07-09	1610-901-0825	ND
2019-07-09	1610-902-1025	1.40 ppb
2019-07-09	1610-903-0920	ND
2019-07-09	1610-904-1041	1.000 ppb
2019-07-09	1610-905-1006	1.20 ppb
2019-07-09	1610-906-0855	ND
2019-07-09	1610-907-0942	1.40 ppb
2019-10-08	1610-900-0749	3.90 ppb
2019-10-08	1610-901-0819	4.20 ppb
2019-10-08	1610-902-1027	4.70 ppb
2019-10-08	1610-903-0920	2.30 ppb
2019-10-08	1610-904-1045	3.40 ppb
2019-10-08	1610-905-0958	3.40 ppb
2019-10-08	1610-906-0859	3.00 ppb
2019-10-08	1610-907-0939	4.40 ppb