Dichloroacetic acid

Santa Clarita Water Division

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)

126

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.228 ppb	32	6	ND - 1.40 ppb
2015	1.01 ppb	32	14	ND - 5.70 ppb
2016	0.903 ppb	32	13	ND - 3.60 ppb
2017	4.28 ppb	32	32	2.20 ppb - 9.40 ppb
2018	3.98 ppb	32	31	ND - 20.0 ppb
2019	2.99 ppb	32	30	ND - 6.90 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
2014-02-13	9590-800-0950	ND
2014-02-13	9590-801-1110	ND
2014-02-13	9590-802-1130	ND
2014-02-13	9590-803-1005	1.20 ppb
2014-02-13	9590-804-1000	ND
2014-02-13	9590-805-1115	ND
2014-02-13	9590-806-1040	ND
2014-02-13	9590-807-1140	ND
2014-05-15	9590-800-1200	1.10 ppb
2014-05-15	9590-801-1245	ND
2014-05-15	9590-802-1215	1.10 ppb
2014-05-15	9590-803-1310	ND
2014-05-15	9590-804-1400	ND
2014-05-15	9590-805-1500	ND
2014-05-15	9590-806-1330	ND
2014-05-15	9590-807-1130	ND
2014-08-14	9590-800-1340	ND
2014-08-14	9590-801-1105	ND
2014-08-14	9590-802-1320	ND
2014-08-14	9590-803-1225	ND
2014-08-14	9590-804-1035	1.30 ppb
2014-08-14	9590-805-1000	ND
2014-08-14	9590-806-1135	1.20 ppb
2014-08-14	9590-807-0925	1.40 ppb
2014-11-13	9590-800-1345	ND
2014-11-13	9590-801-1230	ND
2014-11-13	9590-802-1315	ND
2014-11-13	9590-803-1345	ND
2014-11-13	9590-804-1410	ND
2014-11-13	9590-805-1115	ND
2014-11-13	9590-806-1340	ND
2014-11-13	9590-807-1155	ND
2015-02-12	9590-800-1245	1.20 ppb
2015-02-12	9590-801-1005	3.80 ppb
2015-02-12	9590-802-1240	1.10 ppb
2015-02-12	9590-803-1130	1.60 ppb
2015-02-12	9590-804-1030	1.60 ppb
2015-02-12	9590-805-1100	1.10 ppb
2015-02-12	9590-806-1105	ND
2015-02-12	9590-807-1145	2.00 ppb
2015-05-14	9590-800-1120	ND
2015-05-14	9590-801-1050	5.20 ppb
2015-05-14	9590-802-1100	ND
2015-05-14	9590-803-1140	ND
2015-05-14	9590-804-0950	ND
2015-05-14	9590-805-1015	ND
2015-05-14	9590-806-1400	ND
2015-05-14	9590-807-1320	ND
2015-08-13	9590-800-1120	1.70 ppb
2015-08-13	9590-801-1100	5.70 ppb
2015-08-13	9590-802-1113	ND
2015-08-13	9590-803-0942	2.40 ppb
2015-08-13	9590-804-1055	ND
2015-08-13	9590-805-1030	ND
2015-08-13	9590-806-1025	ND
2015-08-13	9590-807-0945	2.00 ppb
2015-11-09	9590-800-0900	ND
2015-11-09	9590-801-0825	1.80 ppb
2015-11-09	9590-802-0830	ND
2015-11-09	9590-803-0945	1.20 ppb
2015-11-09	9590-804-0845	ND
2015-11-09	9590-805-0710	ND
2015-11-09	9590-806-1030	ND
2015-11-09	9590-807-1000	ND
2016-02-08	9590-800-1025	ND
2016-02-08	9590-801-0930	1.40 ppb
2016-02-08	9590-802-1000	ND
2016-02-08	9590-803-0910	ND
2016-02-08	9590-804-1040	1.20 ppb
2016-02-08	9590-805-1115	ND
2016-02-08	9590-806-0950	ND
2016-02-08	9590-807-0840	1.20 ppb
2016-05-09	9590-800-0900	ND
2016-05-09	9590-801-1000	ND
2016-05-09	9590-802-0830	ND
2016-05-09	9590-803-0935	ND
2016-05-09	9590-804-0925	ND
2016-05-09	9590-805-0900	ND
2016-05-09	9590-806-1030	ND
2016-05-09	9590-807-1030	ND
2016-08-08	9590-800-0910	ND
2016-08-08	9590-801-0845	2.80 ppb
2016-08-08	9590-802-0900	ND
2016-08-08	9590-803-1030	ND
2016-08-08	9590-804-1140	ND
2016-08-08	9590-805-1045	ND
2016-08-08	9590-806-1100	1.10 ppb
2016-08-08	9590-807-0950	ND
2016-11-07	9590-800-0835	3.00 ppb
2016-11-07	9590-801-0905	2.10 ppb
2016-11-07	9590-802-0845	2.40 ppb
2016-11-07	9590-803-0840	3.60 ppb
2016-11-07	9590-804-0940	3.20 ppb
2016-11-07	9590-805-0905	1.60 ppb
2016-11-07	9590-806-0910	2.80 ppb
2016-11-07	9590-807-0900	2.50 ppb
2017-02-06	9590-800-0945	4.80 ppb
2017-02-06	9590-801-1035	5.30 ppb
2017-02-06	9590-802-1010	3.80 ppb
2017-02-06	9590-803-1100	4.40 ppb
2017-02-06	9590-804-1400	3.60 ppb
2017-02-06	9590-805-1320	3.00 ppb
2017-02-06	9590-806-1420	3.30 ppb
2017-02-06	9590-807-1130	4.00 ppb
2017-05-08	9590-800-1010	4.10 ppb
2017-05-08	9590-801-0840	3.40 ppb
2017-05-08	9590-802-0900	2.90 ppb
2017-05-08	9590-803-0920	3.40 ppb
2017-05-08	9590-804-0945	2.90 ppb
2017-05-08	9590-805-0920	3.30 ppb
2017-05-08	9590-806-0940	3.40 ppb
2017-05-08	9590-807-0830	2.90 ppb
2017-08-07	9590-800-0915	6.20 ppb
2017-08-07	9590-801-1015	9.40 ppb
2017-08-07	9590-802-0940	6.10 ppb
2017-08-07	9590-803-1020	3.70 ppb
2017-08-07	9590-804-1320	2.20 ppb
2017-08-07	9590-805-1010	4.10 ppb
2017-08-07	9590-806-1130	2.80 ppb
2017-08-07	9590-807-0900	4.40 ppb
2017-11-13	9590-800-1150	9.10 ppb
2017-11-13	9590-801-1115	8.20 ppb
2017-11-13	9590-802-1135	4.20 ppb
2017-11-13	9590-803-1410	3.70 ppb
2017-11-13	9590-804-1130	3.70 ppb
2017-11-13	9590-805-1200	3.20 ppb
2017-11-13	9590-806-1345	4.30 ppb
2017-11-13	9590-807-1400	3.20 ppb
2018-02-05	9590-800-0945	3.20 ppb
2018-02-05	9590-801-1020	5.30 ppb
2018-02-05	9590-802-1000	3.80 ppb
2018-02-05	9590-803-0925	3.80 ppb
2018-02-05	9590-804-1200	3.00 ppb
2018-02-05	9590-805-1050	3.40 ppb
2018-02-05	9590-806-0900	2.00 ppb
2018-02-05	9590-807-0930	3.20 ppb
2018-05-07	9590-800-0845	4.30 ppb
2018-05-07	9590-801-0955	20.0 ppb
2018-05-07	9590-802-0835	2.80 ppb
2018-05-07	9590-803-1125	4.60 ppb
2018-05-07	9590-804-1130	2.90 ppb
2018-05-07	9590-805-1025	2.90 ppb
2018-05-07	9590-806-1110	ND
2018-05-07	9590-807-0910	2.20 ppb
2018-08-06	9590-800-1115	7.10 ppb
2018-08-06	9590-801-1125	4.40 ppb
2018-08-06	9590-802-1325	2.40 ppb
2018-08-06	9590-803-0845	1.000 ppb
2018-08-06	9590-804-1030	2.90 ppb
2018-08-06	9590-805-1000	2.10 ppb
2018-08-06	9590-806-0930	1.90 ppb
2018-08-06	9590-807-0840	3.40 ppb
2018-11-05	9590-800-1315	5.30 ppb
2018-11-05	9590-801-0945	14.0 ppb
2018-11-05	9590-802-0830	2.80 ppb
2018-11-05	9590-803-1215	3.30 ppb
2018-11-05	9590-804-1130	2.10 ppb
2018-11-05	9590-805-0840	2.70 ppb
2018-11-05	9590-806-1115	2.40 ppb
2018-11-05	9590-807-0700	2.30 ppb
2019-02-19	9590-800-1030	6.90 ppb
2019-02-19	9590-801-1050	6.90 ppb
2019-02-19	9590-802-0950	3.50 ppb
2019-02-19	9590-803-1135	3.70 ppb
2019-02-19	9590-804-1005	1.50 ppb
2019-02-19	9590-805-1200	3.70 ppb
2019-02-19	9590-806-1115	3.70 ppb
2019-02-19	9590-807-0840	ND
2019-05-13	9590-800-1030	3.60 ppb
2019-05-13	9590-801-1100	5.80 ppb
2019-05-13	9590-802-1040	2.40 ppb
2019-05-13	9590-803-1200	2.50 ppb
2019-05-13	9590-804-0940	1.80 ppb
2019-05-13	9590-805-0910	2.70 ppb
2019-05-13	9590-806-1130	2.50 ppb
2019-05-13	9590-807-0820	4.50 ppb
2019-08-12	9590-800-0810	3.00 ppb
2019-08-12	9590-801-0900	ND
2019-08-12	9590-802-0830	3.50 ppb
2019-08-12	9590-803-0745	1.40 ppb
2019-08-12	9590-804-1000	5.20 ppb
2019-08-12	9590-805-1030	2.20 ppb
2019-08-12	9590-806-0930	1.70 ppb
2019-08-12	9590-807-1150	3.00 ppb
2019-11-04	9590-800-0945	2.20 ppb
2019-11-04	9590-801-1015	4.60 ppb
2019-11-04	9590-802-1000	3.00 ppb
2019-11-04	9590-804-0845	2.50 ppb
2019-11-04	9590-805-0910	2.20 ppb
2019-11-04	9590-807-1040	2.70 ppb
2019-11-14	9590-803-0955	1.40 ppb
2019-11-14	9590-806-1020	1.40 ppb