Dichloroacetic acid

City of Concord

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)

192

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	21.2 ppb	32	32	7.30 ppb - 31.0 ppb
2015	21.7 ppb	32	32	7.70 ppb - 37.0 ppb
2016	22.2 ppb	32	32	4.10 ppb - 44.0 ppb
2017	22.3 ppb	32	32	5.20 ppb - 42.0 ppb
2018	24.1 ppb	32	32	7.10 ppb - 44.0 ppb
2019	19.8 ppb	32	32	11.0 ppb - 37.0 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	8221-021914-B01M	24.4 ppb
2014-02-19	8221-021914-B02M	21.0 ppb
2014-02-19	8221-021914-B03M	19.4 ppb
2014-02-19	8221-021914-B04M	26.6 ppb
2014-02-19	8221-021914-B05M	23.8 ppb
2014-02-19	8221-021914-B06M	18.9 ppb
2014-02-19	8221-021914-B07M	21.0 ppb
2014-02-19	8221-021914-B08M	20.4 ppb
2014-05-14	8221-051414-B01M	29.0 ppb
2014-05-14	8221-051414-B02M	30.9 ppb
2014-05-14	8221-051414-B03M	29.2 ppb
2014-05-14	8221-051414-B04M	27.0 ppb
2014-05-14	8221-051414-B05M	31.0 ppb
2014-05-14	8221-051414-B06M	26.5 ppb
2014-05-14	8221-051414-B07M	26.5 ppb
2014-05-14	8221-051414-B08M	22.9 ppb
2014-08-06	8221-080614-B01M	12.4 ppb
2014-08-06	8221-080614-B02M	26.6 ppb
2014-08-06	8221-080614-B03M	25.8 ppb
2014-08-06	8221-080614-B04M	7.30 ppb
2014-08-06	8221-080614-B05M	22.8 ppb
2014-08-06	8221-080614-B06M	25.2 ppb
2014-08-06	8221-080614-B07M	18.5 ppb
2014-08-06	8221-080614-B08M	13.9 ppb
2014-11-12	8221-111214-B01M	18.6 ppb
2014-11-12	8221-111214-B02M	15.4 ppb
2014-11-12	8221-111214-B03M	15.7 ppb
2014-11-12	8221-111214-B04M	14.8 ppb
2014-11-12	8221-111214-B05M	15.6 ppb
2014-11-12	8221-111214-B06M	15.9 ppb
2014-11-12	8221-111214-B07M	17.1 ppb
2014-11-12	8221-111214-B08M	14.0 ppb
2015-02-11		17.3 ppb
2015-02-11		14.6 ppb
2015-02-11		15.0 ppb
2015-02-11		13.1 ppb
2015-02-11		13.4 ppb
2015-02-11		16.5 ppb
2015-02-11		17.2 ppb
2015-02-11		16.7 ppb
2015-05-13		22.1 ppb
2015-05-13		31.6 ppb
2015-05-13		28.4 ppb
2015-05-13		24.1 ppb
2015-05-13		23.4 ppb
2015-05-13		27.4 ppb
2015-05-13		25.1 ppb
2015-05-20		28.0 ppb
2015-08-12		7.70 ppb
2015-08-12		23.0 ppb
2015-08-12		26.0 ppb
2015-08-12		24.0 ppb
2015-08-12		21.0 ppb
2015-08-12		37.0 ppb
2015-08-12		13.0 ppb
2015-08-12		20.0 ppb
2015-11-11		15.0 ppb
2015-11-11		23.0 ppb
2015-11-11		22.0 ppb
2015-11-11		25.0 ppb
2015-11-11		25.0 ppb
2015-11-11		23.0 ppb
2015-11-11		30.0 ppb
2015-11-11		25.0 ppb
2016-02-09	3398151	26.0 ppb
2016-02-09	3398152	23.0 ppb
2016-02-09	3398153	24.0 ppb
2016-02-09	3398154	26.0 ppb
2016-02-09	3398155	20.0 ppb
2016-02-09	3398156	23.0 ppb
2016-02-09	3398157	25.0 ppb
2016-02-09	3398158	28.0 ppb
2016-05-10	3445899	21.0 ppb
2016-05-10	3445900	14.0 ppb
2016-05-10	3445901	12.0 ppb
2016-05-10	3445902	15.0 ppb
2016-05-10	3445903	17.0 ppb
2016-05-10	3445904	14.0 ppb
2016-05-10	3445905	14.0 ppb
2016-05-10	3445906	12.0 ppb
2016-08-09	3516973	4.10 ppb
2016-08-09	3516974	24.0 ppb
2016-08-09	3516975	31.0 ppb
2016-08-09	3516976	28.0 ppb
2016-08-09	3516977	38.0 ppb
2016-08-09	3516978	34.0 ppb
2016-08-09	3516979	44.0 ppb
2016-08-09	3516980	28.0 ppb
2016-11-08	3582273	29.0 ppb
2016-11-08	3582274	16.0 ppb
2016-11-08	3582275	17.0 ppb
2016-11-08	3582276	17.0 ppb
2016-11-08	3582277	24.0 ppb
2016-11-08	3582278	17.0 ppb
2016-11-08	3582279	28.0 ppb
2016-11-08	3582280	16.0 ppb
2017-02-14	3638212	42.0 ppb
2017-02-14	3638213	18.0 ppb
2017-02-14	3638214	17.0 ppb
2017-02-14	3638215	15.0 ppb
2017-02-14	3638216	32.0 ppb
2017-02-14	3638217	17.0 ppb
2017-02-14	3638218	36.0 ppb
2017-02-14	3638219	20.0 ppb
2017-05-09	3691015	26.0 ppb
2017-05-09	3691016	18.0 ppb
2017-05-09	3691017	18.0 ppb
2017-05-09	3691018	19.0 ppb
2017-05-09	3691019	30.0 ppb
2017-05-09	3691020	18.0 ppb
2017-05-09	3691021	37.0 ppb
2017-05-09	3691022	17.0 ppb
2017-08-08	3751659	7.40 ppb
2017-08-08	3751660	33.0 ppb
2017-08-08	3751661	29.0 ppb
2017-08-08	3751662	27.0 ppb
2017-08-08	3751663	30.0 ppb
2017-08-08	3751664	37.0 ppb
2017-08-08	3751665	19.0 ppb
2017-08-08	3751666	35.0 ppb
2017-11-16	3823072	18.0 ppb
2017-11-16	3823073	16.0 ppb
2017-11-16	3823074	16.0 ppb
2017-11-16	3823075	15.0 ppb
2017-11-16	3823076	16.0 ppb
2017-11-16	3823077	16.0 ppb
2017-11-16	3823078	5.20 ppb
2017-11-16	3823079	15.0 ppb
2018-02-13	3871452	11.0 ppb
2018-02-13	3871453	11.0 ppb
2018-02-13	3871454	11.0 ppb
2018-02-13	3871455	8.00 ppb
2018-02-13	3871456	7.10 ppb
2018-02-13	3871457	11.0 ppb
2018-02-13	3871458	8.20 ppb
2018-02-13	3871459	15.0 ppb
2018-05-08	3931399	25.0 ppb
2018-05-08	3931400	30.0 ppb
2018-05-08	3931401	30.0 ppb
2018-05-08	3931402	25.0 ppb
2018-05-08	3931403	21.0 ppb
2018-05-08	3931405	22.0 ppb
2018-05-08	3931406	25.0 ppb
2018-05-24	3946295	30.0 ppb
2018-08-21	4031494	42.0 ppb
2018-08-21	4031495	34.0 ppb
2018-08-21	4031496	30.0 ppb
2018-08-21	4031497	39.0 ppb
2018-08-21	4031498	44.0 ppb
2018-08-21	4031499	38.0 ppb
2018-08-21	4031500	40.0 ppb
2018-08-21	4031501	24.0 ppb
2018-11-13	4121273	26.0 ppb
2018-11-13	4121275	7.30 ppb
2018-11-13	4121277	14.0 ppb
2018-11-13	4121352	29.0 ppb
2018-11-13	4121354	30.0 ppb
2018-11-13	4121356	30.0 ppb
2018-11-13	4121358	24.0 ppb
2018-11-13	4121360	31.0 ppb
2019-02-12	4195491-1	15.0 ppb
2019-02-12	4195492-1	15.0 ppb
2019-02-12	4195493-1	15.0 ppb
2019-02-12	4195494-1	14.0 ppb
2019-02-12	4195495-1	14.0 ppb
2019-02-12	4195496-1	16.0 ppb
2019-02-12	4195497-1	17.0 ppb
2019-02-12	4195498-1	18.0 ppb
2019-05-14	4294421	17.0 ppb
2019-05-14	4294423	21.0 ppb
2019-05-14	4294425	21.0 ppb
2019-05-14	4294427	18.0 ppb
2019-05-14	4294429	14.0 ppb
2019-05-14	4294431	19.0 ppb
2019-05-14	4294433	19.0 ppb
2019-05-14	4294435	18.0 ppb
2019-08-13	4385973	31.0 ppb
2019-08-13	4385975	21.0 ppb
2019-08-13	4385977	18.0 ppb
2019-08-13	4385979	29.0 ppb
2019-08-13	4385981	37.0 ppb
2019-08-13	4385983	19.0 ppb
2019-08-13	4385985	35.0 ppb
2019-08-13	4385987	17.0 ppb
2019-11-12	4483518	23.0 ppb
2019-11-12	4483520	13.0 ppb
2019-11-12	4483522	13.0 ppb
2019-11-12	4483524	27.0 ppb
2019-11-12	4483526	31.0 ppb
2019-11-12	4483528	16.0 ppb
2019-11-12	4483530	23.0 ppb
2019-11-12	4483532	11.0 ppb