Trichloroacetic acid

City of Concord

Trichloroacetic 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	25.4 ppb	32	32	9.10 ppb - 39.0 ppb
2015	25.3 ppb	32	32	12.9 ppb - 38.2 ppb
2016	27.0 ppb	32	32	13.0 ppb - 51.0 ppb
2017	21.9 ppb	32	32	12.0 ppb - 32.0 ppb
2018	24.4 ppb	32	32	12.0 ppb - 37.0 ppb
2019	17.2 ppb	32	32	12.0 ppb - 22.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic 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	24.0 ppb
2014-02-19	8221-021914-B02M	27.8 ppb
2014-02-19	8221-021914-B03M	23.9 ppb
2014-02-19	8221-021914-B04M	27.3 ppb
2014-02-19	8221-021914-B05M	24.5 ppb
2014-02-19	8221-021914-B06M	23.6 ppb
2014-02-19	8221-021914-B07M	29.6 ppb
2014-02-19	8221-021914-B08M	25.0 ppb
2014-05-14	8221-051414-B01M	30.2 ppb
2014-05-14	8221-051414-B02M	39.0 ppb
2014-05-14	8221-051414-B03M	34.8 ppb
2014-05-14	8221-051414-B04M	26.0 ppb
2014-05-14	8221-051414-B05M	32.4 ppb
2014-05-14	8221-051414-B06M	32.6 ppb
2014-05-14	8221-051414-B07M	27.1 ppb
2014-05-14	8221-051414-B08M	31.6 ppb
2014-08-06	8221-080614-B01M	21.4 ppb
2014-08-06	8221-080614-B02M	30.4 ppb
2014-08-06	8221-080614-B03M	28.5 ppb
2014-08-06	8221-080614-B04M	9.10 ppb
2014-08-06	8221-080614-B05M	21.7 ppb
2014-08-06	8221-080614-B06M	28.5 ppb
2014-08-06	8221-080614-B07M	24.0 ppb
2014-08-06	8221-080614-B08M	23.7 ppb
2014-11-12	8221-111214-B01M	24.6 ppb
2014-11-12	8221-111214-B02M	21.0 ppb
2014-11-12	8221-111214-B03M	22.0 ppb
2014-11-12	8221-111214-B04M	15.8 ppb
2014-11-12	8221-111214-B05M	18.2 ppb
2014-11-12	8221-111214-B06M	21.8 ppb
2014-11-12	8221-111214-B07M	24.5 ppb
2014-11-12	8221-111214-B08M	17.7 ppb
2015-02-11		17.3 ppb
2015-02-11		18.4 ppb
2015-02-11		17.7 ppb
2015-02-11		12.9 ppb
2015-02-11		14.5 ppb
2015-02-11		21.9 ppb
2015-02-11		21.5 ppb
2015-02-11		20.0 ppb
2015-05-13		20.5 ppb
2015-05-13		38.2 ppb
2015-05-13		33.8 ppb
2015-05-13		21.1 ppb
2015-05-13		21.7 ppb
2015-05-13		30.7 ppb
2015-05-13		32.9 ppb
2015-05-20		37.1 ppb
2015-08-12		21.0 ppb
2015-08-12		23.0 ppb
2015-08-12		27.0 ppb
2015-08-12		20.0 ppb
2015-08-12		18.0 ppb
2015-08-12		34.0 ppb
2015-08-12		24.0 ppb
2015-08-12		29.0 ppb
2015-11-11		25.0 ppb
2015-11-11		34.0 ppb
2015-11-11		32.0 ppb
2015-11-11		22.0 ppb
2015-11-11		26.0 ppb
2015-11-11		33.0 ppb
2015-11-11		23.0 ppb
2015-11-11		38.0 ppb
2016-02-09	3398151	30.0 ppb
2016-02-09	3398152	42.0 ppb
2016-02-09	3398153	41.0 ppb
2016-02-09	3398154	29.0 ppb
2016-02-09	3398155	24.0 ppb
2016-02-09	3398156	42.0 ppb
2016-02-09	3398157	29.0 ppb
2016-02-09	3398158	51.0 ppb
2016-05-10	3445903	15.0 ppb
2016-05-10	3445904	20.0 ppb
2016-05-10	3445905	13.0 ppb
2016-05-10	3445906	21.0 ppb
2016-05-10	3445899	20.0 ppb
2016-05-10	3445900	19.0 ppb
2016-05-10	3445901	17.0 ppb
2016-05-10	3445902	18.0 ppb
2016-08-09	3516973	22.0 ppb
2016-08-09	3516974	33.0 ppb
2016-08-09	3516975	34.0 ppb
2016-08-09	3516976	23.0 ppb
2016-08-09	3516977	25.0 ppb
2016-08-09	3516978	36.0 ppb
2016-08-09	3516979	26.0 ppb
2016-08-09	3516980	33.0 ppb
2016-11-08	3582273	20.0 ppb
2016-11-08	3582274	29.0 ppb
2016-11-08	3582275	29.0 ppb
2016-11-08	3582276	20.0 ppb
2016-11-08	3582277	22.0 ppb
2016-11-08	3582278	30.0 ppb
2016-11-08	3582279	20.0 ppb
2016-11-08	3582280	32.0 ppb
2017-02-14	3638212	30.0 ppb
2017-02-14	3638213	27.0 ppb
2017-02-14	3638214	25.0 ppb
2017-02-14	3638215	14.0 ppb
2017-02-14	3638216	25.0 ppb
2017-02-14	3638217	26.0 ppb
2017-02-14	3638218	27.0 ppb
2017-02-14	3638219	30.0 ppb
2017-05-09	3691015	22.0 ppb
2017-05-09	3691016	30.0 ppb
2017-05-09	3691017	29.0 ppb
2017-05-09	3691018	18.0 ppb
2017-05-09	3691019	24.0 ppb
2017-05-09	3691020	28.0 ppb
2017-05-09	3691021	24.0 ppb
2017-05-09	3691022	32.0 ppb
2017-08-08	3751659	24.0 ppb
2017-08-08	3751660	23.0 ppb
2017-08-08	3751661	20.0 ppb
2017-08-08	3751662	20.0 ppb
2017-08-08	3751663	21.0 ppb
2017-08-08	3751664	26.0 ppb
2017-08-08	3751665	20.0 ppb
2017-08-08	3751666	27.0 ppb
2017-11-16	3823072	13.0 ppb
2017-11-16	3823073	14.0 ppb
2017-11-16	3823074	14.0 ppb
2017-11-16	3823075	12.0 ppb
2017-11-16	3823076	12.0 ppb
2017-11-16	3823077	14.0 ppb
2017-11-16	3823078	13.0 ppb
2017-11-16	3823079	16.0 ppb
2018-02-13	3871452	14.0 ppb
2018-02-13	3871453	12.0 ppb
2018-02-13	3871454	13.0 ppb
2018-02-13	3871455	13.0 ppb
2018-02-13	3871456	13.0 ppb
2018-02-13	3871457	13.0 ppb
2018-02-13	3871458	14.0 ppb
2018-02-13	3871459	15.0 ppb
2018-05-08	3931399	21.0 ppb
2018-05-08	3931400	22.0 ppb
2018-05-08	3931401	22.0 ppb
2018-05-08	3931402	21.0 ppb
2018-05-08	3931403	19.0 ppb
2018-05-08	3931405	18.0 ppb
2018-05-08	3931406	21.0 ppb
2018-05-24	3946295	20.0 ppb
2018-08-21	4031494	30.0 ppb
2018-08-21	4031495	30.0 ppb
2018-08-21	4031496	27.0 ppb
2018-08-21	4031497	28.0 ppb
2018-08-21	4031498	33.0 ppb
2018-08-21	4031499	31.0 ppb
2018-08-21	4031500	32.0 ppb
2018-08-21	4031501	32.0 ppb
2018-11-13	4121273	32.0 ppb
2018-11-13	4121275	33.0 ppb
2018-11-13	4121277	37.0 ppb
2018-11-13	4121352	36.0 ppb
2018-11-13	4121354	31.0 ppb
2018-11-13	4121356	31.0 ppb
2018-11-13	4121358	34.0 ppb
2018-11-13	4121360	33.0 ppb
2019-02-12	4195491-1	18.0 ppb
2019-02-12	4195492-1	17.0 ppb
2019-02-12	4195493-1	16.0 ppb
2019-02-12	4195494-1	16.0 ppb
2019-02-12	4195495-1	16.0 ppb
2019-02-12	4195496-1	19.0 ppb
2019-02-12	4195497-1	20.0 ppb
2019-02-12	4195498-1	20.0 ppb
2019-05-14	4294421	14.0 ppb
2019-05-14	4294423	21.0 ppb
2019-05-14	4294425	21.0 ppb
2019-05-14	4294427	16.0 ppb
2019-05-14	4294429	12.0 ppb
2019-05-14	4294431	20.0 ppb
2019-05-14	4294433	15.0 ppb
2019-05-14	4294435	21.0 ppb
2019-08-13	4385973	16.0 ppb
2019-08-13	4385975	14.0 ppb
2019-08-13	4385977	13.0 ppb
2019-08-13	4385979	16.0 ppb
2019-08-13	4385981	19.0 ppb
2019-08-13	4385983	14.0 ppb
2019-08-13	4385985	20.0 ppb
2019-08-13	4385987	21.0 ppb
2019-11-12	4483518	16.0 ppb
2019-11-12	4483520	13.0 ppb
2019-11-12	4483522	12.0 ppb
2019-11-12	4483524	20.0 ppb
2019-11-12	4483526	22.0 ppb
2019-11-12	4483528	16.0 ppb
2019-11-12	4483530	19.0 ppb
2019-11-12	4483532	17.0 ppb