Dichloroacetic acid

Sulphur Water System

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

184

Samples

Samples exceeding legal limit (MCL)

128

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	ND	24	0	ND
2015	0.336 ppb	32	8	ND - 1.70 ppb
2016	0.973 ppb	32	24	ND - 1.80 ppb
2017	1.27 ppb	32	32	0.850 ppb - 1.90 ppb
2018	1.58 ppb	32	32	0.960 ppb - 2.40 ppb
2019	1.22 ppb	32	32	0.680 ppb - 2.10 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
2014-05-21	L0043246-01	ND
2014-05-21	L0043246-02	ND
2014-05-21	L0043246-03	ND
2014-05-21	L0043246-04	ND
2014-05-21	L0043246-01	ND
2014-05-21	L0043246-02	ND
2014-05-21	L0043246-03	ND
2014-05-21	L0043246-04	ND
2014-08-13	L0046638-01	ND
2014-08-13	L0046638-02	ND
2014-08-13	L0046638-03	ND
2014-08-13	L0046638-04	ND
2014-08-13	L0046638-01	ND
2014-08-13	L0046638-02	ND
2014-08-13	L0046638-03	ND
2014-08-13	L0046638-04	ND
2014-11-18	L0050771-01	ND
2014-11-18	L0050771-02	ND
2014-11-18	L0050771-03	ND
2014-11-18	L0050771-04	ND
2014-11-18	L0050771-01	ND
2014-11-18	L0050771-02	ND
2014-11-18	L0050771-03	ND
2014-11-18	L0050771-04	ND
2015-02-12	LA3487-1	ND
2015-02-12	LA3487-2	ND
2015-02-12	LA3487-3	ND
2015-02-12	LA3487-4	ND
2015-02-12	LA3487-1	ND
2015-02-12	LA3487-2	ND
2015-02-12	LA3487-3	ND
2015-02-12	LA3487-4	ND
2015-05-21	LA7268-1	ND
2015-05-21	LA7268-2	ND
2015-05-21	LA7268-3	ND
2015-05-21	LA7268-4	ND
2015-05-21	LA7268-1	ND
2015-05-21	LA7268-2	ND
2015-05-21	LA7268-3	ND
2015-05-21	LA7268-4	ND
2015-09-09	LA11381-1	1.40 ppb
2015-09-09	LA11381-2	0.880 ppb
2015-09-09	LA11381-3	ND
2015-09-09	LA11381-4	1.70 ppb
2015-09-09	LA11381-1	1.40 ppb
2015-09-09	LA11381-2	0.880 ppb
2015-09-09	LA11381-3	ND
2015-09-09	LA11381-4	1.70 ppb
2015-12-03	LA14715-1	ND
2015-12-03	LA14715-2	1.40 ppb
2015-12-03	LA14715-3	ND
2015-12-03	LA14715-4	ND
2015-12-03	LA14715-1	ND
2015-12-03	LA14715-2	1.40 ppb
2015-12-03	LA14715-3	ND
2015-12-03	LA14715-4	ND
2016-02-23	LA17652-1	0.960 ppb
2016-02-23	LA17652-2	ND
2016-02-23	LA17652-3	ND
2016-02-23	LA17652-4	ND
2016-02-23	LA17652-1	0.960 ppb
2016-02-23	LA17652-2	ND
2016-02-23	LA17652-3	ND
2016-02-23	LA17652-4	ND
2016-05-17	LA20834-1	1.80 ppb
2016-05-17	LA20834-2	1.10 ppb
2016-05-17	LA20834-3	1.000 ppb
2016-05-17	LA20834-4	1.20 ppb
2016-05-17	LA20834-1	1.80 ppb
2016-05-17	LA20834-2	1.10 ppb
2016-05-17	LA20834-3	1.000 ppb
2016-05-17	LA20834-4	1.20 ppb
2016-08-16	LA24340-1	1.40 ppb
2016-08-16	LA24340-2	1.40 ppb
2016-08-16	LA24340-3	1.60 ppb
2016-08-16	LA24340-4	1.60 ppb
2016-08-16	LA24340-1	1.40 ppb
2016-08-16	LA24340-2	1.40 ppb
2016-08-16	LA24340-3	1.60 ppb
2016-08-16	LA24340-4	1.60 ppb
2016-11-29	LA28117-1	1.20 ppb
2016-11-29	LA28117-2	ND
2016-11-29	LA28118-1	1.000 ppb
2016-11-29	LA28118-2	1.30 ppb
2016-11-29	LA28117-1	1.20 ppb
2016-11-29	LA28117-2	ND
2016-11-29	LA28118-1	1.000 ppb
2016-11-29	LA28118-2	1.30 ppb
2017-02-10	35294574001	1.10 ppb
2017-02-10	35294574002	1.90 ppb
2017-02-10	35294574003	0.860 ppb
2017-02-10	35294574004	1.20 ppb
2017-02-10	35294574001	1.10 ppb
2017-02-10	35294574002	1.90 ppb
2017-02-10	35294574003	0.860 ppb
2017-02-10	35294574004	1.20 ppb
2017-05-12	35312127005	1.20 ppb
2017-05-12	35312127006	1.60 ppb
2017-05-12	35312127007	1.80 ppb
2017-05-12	35312127008	1.70 ppb
2017-05-12	35312127005	1.20 ppb
2017-05-12	35312127006	1.60 ppb
2017-05-12	35312127007	1.80 ppb
2017-05-12	35312127008	1.70 ppb
2017-08-04	35328360001	0.980 ppb
2017-08-04	35328360002	1.60 ppb
2017-08-04	35328360003	1.20 ppb
2017-08-04	35328360004	1.10 ppb
2017-08-04	35328360001	0.980 ppb
2017-08-04	35328360002	1.60 ppb
2017-08-04	35328360003	1.20 ppb
2017-08-04	35328360004	1.10 ppb
2017-11-02	35346180001	0.850 ppb
2017-11-02	35346180002	1.20 ppb
2017-11-02	35346180003	0.870 ppb
2017-11-02	35346180004	1.20 ppb
2017-11-02	35346180001	0.850 ppb
2017-11-02	35346180002	1.20 ppb
2017-11-02	35346180003	0.870 ppb
2017-11-02	35346180004	1.20 ppb
2018-02-09	35374053001	1.30 ppb
2018-02-09	35374053002	1.70 ppb
2018-02-09	35374053003	1.40 ppb
2018-02-09	35374053004	1.60 ppb
2018-02-09	35374053001	1.30 ppb
2018-02-09	35374053002	1.70 ppb
2018-02-09	35374053003	1.40 ppb
2018-02-09	35374053004	1.60 ppb
2018-05-02	35390319001	1.70 ppb
2018-05-02	35390319002	1.70 ppb
2018-05-02	35390319003	0.960 ppb
2018-05-02	35390319004	1.60 ppb
2018-05-02	35390319001	1.70 ppb
2018-05-02	35390319002	1.70 ppb
2018-05-02	35390319003	0.960 ppb
2018-05-02	35390319004	1.60 ppb
2018-08-08	35409908001	1.80 ppb
2018-08-08	35409908002	1.70 ppb
2018-08-08	35409908003	1.20 ppb
2018-08-08	35409908004	1.30 ppb
2018-08-08	35409908001	1.80 ppb
2018-08-08	35409908002	1.70 ppb
2018-08-08	35409908003	1.20 ppb
2018-08-08	35409908004	1.30 ppb
2018-11-08	35430428001	2.40 ppb
2018-11-08	35430428002	1.80 ppb
2018-11-08	35430428003	1.50 ppb
2018-11-08	35430428004	1.60 ppb
2018-11-08	35430428001	2.40 ppb
2018-11-08	35430428002	1.80 ppb
2018-11-08	35430428003	1.50 ppb
2018-11-08	35430428004	1.60 ppb
2019-02-06	35447077001	1.80 ppb
2019-02-06	35447077002	2.10 ppb
2019-02-06	35447077003	0.960 ppb
2019-02-06	35447077004	0.930 ppb
2019-02-06	35447077001	1.80 ppb
2019-02-06	35447077002	2.10 ppb
2019-02-06	35447077003	0.960 ppb
2019-02-06	35447077004	0.930 ppb
2019-05-02	35466136001	0.680 ppb
2019-05-02	35466136002	0.840 ppb
2019-05-02	35466136003	1.000 ppb
2019-05-02	35466136004	1.20 ppb
2019-05-02	35466136001	0.680 ppb
2019-05-02	35466136002	0.840 ppb
2019-05-02	35466136003	1.000 ppb
2019-05-02	35466136004	1.20 ppb
2019-08-08	35489016001	1.17 ppb
2019-08-08	35489016002	1.39 ppb
2019-08-08	35489016003	0.942 ppb
2019-08-08	35489016004	1.11 ppb
2019-08-08	35489016001	1.17 ppb
2019-08-08	35489016002	1.39 ppb
2019-08-08	35489016003	0.942 ppb
2019-08-08	35489016004	1.11 ppb
2019-11-14	35512857001	1.40 ppb
2019-11-14	35512857002	1.40 ppb
2019-11-14	35512857003	1.40 ppb
2019-11-14	35512857004	1.20 ppb
2019-11-14	35512857001	1.40 ppb
2019-11-14	35512857002	1.40 ppb
2019-11-14	35512857003	1.40 ppb
2019-11-14	35512857004	1.20 ppb