Dichloroacetic acid

Pomona Water Department

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

191

Samples

Samples exceeding legal limit (MCL)

121

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	1.33 ppb	32	19	ND - 6.40 ppb
2015	0.813 ppb	32	11	ND - 4.90 ppb
2016	2.42 ppb	33	29	ND - 6.40 ppb
2017	4.27 ppb	32	22	ND - 16.0 ppb
2018	1.63 ppb	31	19	ND - 5.80 ppb
2019	2.36 ppb	31	21	ND - 8.70 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
2014-02-11	9590-800-0738	ND
2014-02-11	9590-801-0849	ND
2014-02-11	9590-802-0916	ND
2014-02-11	9590-803-1005	ND
2014-02-11	9590-804-0943	ND
2014-02-11	9590-805-0830	ND
2014-02-11	9590-806-1027	ND
2014-02-11	9590-807-0803	ND
2014-05-13	9590-800-0803	1.50 ppb
2014-05-13	9590-801-0917	1.40 ppb
2014-05-13	9590-802-0941	ND
2014-05-13	9590-803-1029	1.70 ppb
2014-05-13	9590-804-1052	1.30 ppb
2014-05-13	9590-805-0858	1.30 ppb
2014-05-13	9590-806-1009	2.30 ppb
2014-05-13	9590-807-0830	1.60 ppb
2014-08-12	9590-800-0823	2.30 ppb
2014-08-12	9590-801-0930	6.40 ppb
2014-08-12	9590-802-0800	ND
2014-08-12	9590-803-0858	2.00 ppb
2014-08-12	9590-804-0925	1.70 ppb
2014-08-12	9590-805-0910	3.30 ppb
2014-08-12	9590-806-0830	4.40 ppb
2014-08-12	9590-807-0847	2.20 ppb
2014-11-12	9590-800-0742	1.20 ppb
2014-11-12	9590-801-0845	1.10 ppb
2014-11-12	9590-802-0910	1.30 ppb
2014-11-12	9590-803-0951	ND
2014-11-12	9590-804-1017	4.30 ppb
2014-11-12	9590-805-0829	ND
2014-11-12	9590-806-0934	ND
2014-11-12	9590-807-0802	1.30 ppb
2015-02-09	9590-800-0833	ND
2015-02-09	9590-801-0938	ND
2015-02-09	9590-802-1000	1.20 ppb
2015-02-09	9590-803-1047	4.90 ppb
2015-02-09	9590-804-1113	4.40 ppb
2015-02-09	9590-805-0922	ND
2015-02-09	9590-806-1023	ND
2015-02-09	9590-807-0900	ND
2015-05-12	9590-800-0744	ND
2015-05-12	9590-801-0847	ND
2015-05-12	9590-802-0905	ND
2015-05-12	9590-803-0950	ND
2015-05-12	9590-804-1014	ND
2015-05-12	9590-805-0829	1.30 ppb
2015-05-12	9590-806-0924	ND
2015-05-12	9590-807-0806	ND
2015-08-11	9590-800-0800	ND
2015-08-11	9590-801-0916	2.60 ppb
2015-08-11	9590-802-0939	ND
2015-08-11	9590-803-1029	1.30 ppb
2015-08-11	9590-804-1052	ND
2015-08-11	9590-805-0848	2.70 ppb
2015-08-11	9590-806-1009	ND
2015-08-11	9590-807-0823	ND
2015-11-10	9590-800-1022	ND
2015-11-10	9590-801-0928	1.40 ppb
2015-11-10	9590-802-0900	1.10 ppb
2015-11-10	9590-803-0814	2.00 ppb
2015-11-10	9590-804-0747	3.10 ppb
2015-11-10	9590-805-0951	ND
2015-11-10	9590-806-0836	ND
2015-11-10	9590-807-1045	ND
2016-02-09	9590-800-1020	1.10 ppb
2016-02-09	9590-801-0928	1.30 ppb
2016-02-09	9590-802-0828	1.80 ppb
2016-02-09	9590-803-0751	3.40 ppb
2016-02-09	9590-804-0925	5.10 ppb
2016-02-09	9590-805-0951	1.30 ppb
2016-02-09	9590-806-0856	1.50 ppb
2016-02-09	9590-807-1047	1.20 ppb
2016-05-10	9590-800-0735	2.30 ppb
2016-05-10	9590-801-0848	5.70 ppb
2016-05-10	9590-802-0920	2.70 ppb
2016-05-10	9590-803-1013	3.50 ppb
2016-05-10	9590-804-1037	2.70 ppb
2016-05-10	9590-805-0825	4.40 ppb
2016-05-10	9590-806-0950	1.20 ppb
2016-05-10	9590-807-0800	ND
2016-08-09	9590-800-0714	1.70 ppb
2016-08-09	9590-801-0909	5.60 ppb
2016-08-09	9590-802-0805	4.90 ppb
2016-08-09	9590-803-0910	3.00 ppb
2016-08-09	9590-804-0940	1.50 ppb
2016-08-09	9590-805-0837	1.10 ppb
2016-08-09	9590-806-0843	6.40 ppb
2016-08-09	9590-807-0745	ND
2016-08-25	9590-806-1055	2.50 ppb
2016-11-09	9590-800-1010	1.20 ppb
2016-11-09	9590-801-1131	2.50 ppb
2016-11-09	9590-802-1355	2.80 ppb
2016-11-09	9590-803-1508	ND
2016-11-09	9590-804-1515	ND
2016-11-09	9590-805-1107	4.20 ppb
2016-11-09	9590-806-1425	2.20 ppb
2016-11-09	9590-807-1035	1.000 ppb
2017-02-07	9590-800-1302	ND
2017-02-07	9590-801-1425	3.80 ppb
2017-02-07	9590-802-1540	ND
2017-02-07	9590-803-1400	ND
2017-02-07	9590-804-1425	ND
2017-02-07	9590-805-1405	3.90 ppb
2017-02-07	9590-806-1255	ND
2017-02-07	9590-807-1338	ND
2017-05-11	9590-800-0825	11.0 ppb
2017-05-11	9590-801-0836	16.0 ppb
2017-05-11	9590-802-0935	9.10 ppb
2017-05-11	9590-803-1037	5.10 ppb
2017-05-11	9590-804-1106	4.60 ppb
2017-05-11	9590-805-0755	16.0 ppb
2017-05-11	9590-806-1003	3.60 ppb
2017-05-11	9590-807-1054	4.50 ppb
2017-08-08	9590-800-0804	7.50 ppb
2017-08-08	9590-801-0920	9.20 ppb
2017-08-08	9590-802-0941	8.40 ppb
2017-08-08	9590-803-1042	3.00 ppb
2017-08-08	9590-804-1106	3.30 ppb
2017-08-08	9590-805-0858	10.00 ppb
2017-08-08	9590-806-1010	1.40 ppb
2017-08-08	9590-807-0832	8.30 ppb
2017-11-15	9590-800-0920	ND
2017-11-15	9590-801-1045	2.60 ppb
2017-11-15	9590-802-1314	ND
2017-11-15	9590-803-1415	1.50 ppb
2017-11-15	9590-804-1445	2.00 ppb
2017-11-15	9590-805-1020	1.90 ppb
2017-11-15	9590-806-1340	ND
2017-11-15	9590-807-0945	ND
2018-02-08	9590-800-1034	ND
2018-02-08	9590-801-1152	ND
2018-02-08	9590-802-1300	ND
2018-02-08	9590-803-1358	1.80 ppb
2018-02-08	9590-804-1427	ND
2018-02-08	9590-805-1129	ND
2018-02-08	9590-806-1332	2.20 ppb
2018-02-08	9590-807-1100	ND
2018-05-16	9590-800-0912	1.40 ppb
2018-05-16	9590-801-1116	2.00 ppb
2018-05-16	9590-802-1157	ND
2018-05-16	9590-803-0948	3.70 ppb
2018-05-16	9590-804-1015	4.30 ppb
2018-05-16	9590-805-1049	2.30 ppb
2018-05-16	9590-806-0900	1.60 ppb
2018-05-16	9590-807-1016	1.50 ppb
2018-08-15	9590-800-0751	5.80 ppb
2018-08-15	9590-801-0915	4.40 ppb
2018-08-15	9590-802-0948	ND
2018-08-15	9590-803-1307	ND
2018-08-15	9590-804-1058	ND
2018-08-15	9590-805-0855	4.60 ppb
2018-08-15	9590-806-1018	1.80 ppb
2018-08-15	9590-807-0825	2.90 ppb
2018-11-14	9590-800-0803	1.20 ppb
2018-11-14	9590-801-0953	3.00 ppb
2018-11-14	9590-802-1042	ND
2018-11-14	9590-803-1340	1.60 ppb
2018-11-14	9590-804-1305	1.40 ppb
2018-11-14	9590-805-0922	3.10 ppb
2018-11-14	9590-807-0850	ND
2019-02-12	9590-800-0842	ND
2019-02-12	9590-801-1020	ND
2019-02-12	9590-802-1058	1.70 ppb
2019-02-12	9590-803-1207	1.50 ppb
2019-02-12	9590-804-1205	1.10 ppb
2019-02-12	9590-805-0950	1.50 ppb
2019-02-12	9590-806-1132	1.20 ppb
2019-02-12	9590-807-0922	ND
2019-05-16	9590-800-1526	6.60 ppb
2019-05-16	9590-801-1512	4.50 ppb
2019-05-16	9590-802-1425	ND
2019-05-16	9590-803-1250	4.70 ppb
2019-05-16	9590-804-1215	5.00 ppb
2019-05-16	9590-805-1422	4.50 ppb
2019-05-16	9590-806-1325	4.20 ppb
2019-08-12	9590-800-1159	ND
2019-08-12	9590-801-1342	3.10 ppb
2019-08-12	9590-802-0906	ND
2019-08-12	9590-803-1023	3.00 ppb
2019-08-12	9590-804-1150	3.60 ppb
2019-08-12	9590-805-1103	3.10 ppb
2019-08-12	9590-806-1233	ND
2019-08-12	9590-807-1033	ND
2019-11-12	9590-800-1210	ND
2019-11-12	9590-801-1339	2.40 ppb
2019-11-12	9590-802-0938	1.000 ppb
2019-11-12	9590-803-1115	6.60 ppb
2019-11-12	9590-804-1245	8.70 ppb
2019-11-12	9590-805-1412	1.80 ppb
2019-11-12	9590-806-1325	3.30 ppb
2019-11-12	9590-807-1447	ND