Trichloroacetic acid

Padre Dam Municipal Water District

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)

107

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	1.72 ppb	32	26	ND - 3.40 ppb
2015	1.61 ppb	32	19	ND - 4.40 ppb
2016	0.719 ppb	32	9	ND - 3.60 ppb
2017	1.42 ppb	32	26	ND - 2.50 ppb
2018	0.516 ppb	32	8	ND - 3.40 ppb
2019	1.05 ppb	32	19	ND - 3.60 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
2014-02-12	9590-900-0700	1.40 ppb
2014-02-12	9590-901-0740	2.00 ppb
2014-02-12	9590-902-0800	1.90 ppb
2014-02-12	9590-903-0840	2.10 ppb
2014-02-12	9590-904-0820	2.10 ppb
2014-02-12	9590-905-0720	1.90 ppb
2014-02-12	9590-906-0950	3.10 ppb
2014-02-12	9590-907-0930	3.40 ppb
2014-05-14	9590-900-0700	2.30 ppb
2014-05-14	9590-901-0740	2.10 ppb
2014-05-14	9590-902-0800	2.00 ppb
2014-05-14	9590-903-0850	2.00 ppb
2014-05-14	9590-904-0830	1.80 ppb
2014-05-14	9590-905-0720	2.00 ppb
2014-05-14	9590-906-1000	2.60 ppb
2014-05-14	9590-907-0940	2.50 ppb
2014-08-07	9590-900-0715	1.10 ppb
2014-08-07	9590-901-0815	ND
2014-08-07	9590-902-0835	ND
2014-08-07	9590-903-0930	ND
2014-08-07	9590-904-0905	1.10 ppb
2014-08-07	9590-905-0745	ND
2014-08-07	9590-906-1005	ND
2014-08-07	9590-907-1030	ND
2014-11-13	9590-900-0730	3.00 ppb
2014-11-13	9590-901-0820	2.50 ppb
2014-11-13	9590-902-0840	1.90 ppb
2014-11-13	9590-903-0920	1.80 ppb
2014-11-13	9590-904-0900	1.80 ppb
2014-11-13	9590-905-0800	3.00 ppb
2014-11-13	9590-906-1000	2.30 ppb
2014-11-13	9590-907-1020	1.20 ppb
2015-02-11	9590-900-0740	3.80 ppb
2015-02-11	9590-901-0830	4.00 ppb
2015-02-11	9590-902-0900	4.00 ppb
2015-02-11	9590-903-0940	3.70 ppb
2015-02-11	9590-904-0920	3.80 ppb
2015-02-11	9590-905-0815	4.00 ppb
2015-02-11	9590-906-1010	3.80 ppb
2015-02-11	9590-907-1030	4.40 ppb
2015-05-14	9590-900-0645	ND
2015-05-14	9590-901-0730	1.50 ppb
2015-05-14	9590-902-0745	2.20 ppb
2015-05-14	9590-903-0830	2.70 ppb
2015-05-14	9590-904-0815	1.30 ppb
2015-05-14	9590-905-0710	ND
2015-05-14	9590-906-0915	2.30 ppb
2015-05-14	9590-907-0940	2.20 ppb
2015-08-17	9590-900-0730	ND
2015-08-17	9590-901-0810	1.10 ppb
2015-08-17	9590-902-0825	ND
2015-08-17	9590-903-0900	ND
2015-08-17	9590-904-0845	ND
2015-08-17	9590-905-0745	ND
2015-08-17	9590-906-0945	ND
2015-08-17	9590-907-1015	ND
2015-11-18	9590-900-1045	ND
2015-11-18	9590-901-0800	ND
2015-11-18	9590-902-0815	ND
2015-11-18	9590-903-0900	ND
2015-11-18	9590-904-0840	1.10 ppb
2015-11-18	9590-905-0740	1.10 ppb
2015-11-18	9590-906-0930	2.40 ppb
2015-11-18	9590-907-1000	2.10 ppb
2016-02-10	9590-900-0645	ND
2016-02-10	9590-901-0740	ND
2016-02-10	9590-902-0800	ND
2016-02-10	9590-903-0900	ND
2016-02-10	9590-904-0830	ND
2016-02-10	9590-905-0715	ND
2016-02-10	9590-906-0945	2.40 ppb
2016-02-10	9590-907-1020	2.10 ppb
2016-05-11	9590-900-0700	ND
2016-05-11	9590-901-0800	ND
2016-05-11	9590-902-0820	ND
2016-05-11	9590-903-0900	2.60 ppb
2016-05-11	9590-904-0840	ND
2016-05-11	9590-905-0730	ND
2016-05-11	9590-906-0945	3.60 ppb
2016-05-11	9590-907-1015	3.10 ppb
2016-08-10	9590-900-0710	ND
2016-08-10	9590-901-0750	ND
2016-08-10	9590-902-0810	ND
2016-08-10	9590-903-0850	ND
2016-08-10	9590-904-0830	ND
2016-08-10	9590-905-0730	ND
2016-08-10	9590-906-0930	2.20 ppb
2016-08-10	9590-907-1000	2.00 ppb
2016-11-09	9590-900-0630	ND
2016-11-09	9590-901-0720	ND
2016-11-09	9590-902-0740	ND
2016-11-09	9590-903-0820	ND
2016-11-09	9590-904-0800	ND
2016-11-09	9590-905-0700	ND
2016-11-09	9590-906-1000	2.70 ppb
2016-11-09	9590-907-0900	2.30 ppb
2017-02-08	9590-900-0630	ND
2017-02-08	9590-901-0715	ND
2017-02-08	9590-902-0730	2.00 ppb
2017-02-08	9590-903-0820	2.00 ppb
2017-02-08	9590-904-0800	1.000 ppb
2017-02-08	9590-905-0700	ND
2017-02-08	9590-906-0850	2.10 ppb
2017-02-08	9590-907-0915	2.10 ppb
2017-05-17	9590-900-0640	ND
2017-05-17	9590-901-0715	1.10 ppb
2017-05-17	9590-902-0730	1.60 ppb
2017-05-17	9590-903-0815	1.40 ppb
2017-05-17	9590-904-0800	1.30 ppb
2017-05-17	9590-905-0700	1.40 ppb
2017-05-17	9590-906-0845	1.20 ppb
2017-05-17	9590-907-0910	2.50 ppb
2017-08-09	9590-900-0630	ND
2017-08-09	9590-901-0710	1.80 ppb
2017-08-09	9590-902-0725	1.90 ppb
2017-08-09	9590-903-0745	1.90 ppb
2017-08-09	9590-904-0800	2.00 ppb
2017-08-09	9590-905-0650	1.90 ppb
2017-08-09	9590-906-0830	1.80 ppb
2017-08-09	9590-907-0900	1.30 ppb
2017-11-08	9590-900-0620	ND
2017-11-08	9590-901-0700	1.90 ppb
2017-11-08	9590-902-0720	1.80 ppb
2017-11-08	9590-903-0805	1.80 ppb
2017-11-08	9590-904-0740	1.80 ppb
2017-11-08	9590-905-0645	1.60 ppb
2017-11-08	9590-906-0840	1.90 ppb
2017-11-08	9590-907-0900	2.20 ppb
2018-03-07	9590-900-0710	ND
2018-03-07	9590-901-0750	ND
2018-03-07	9590-902-0810	ND
2018-03-07	9590-903-1020	1.20 ppb
2018-03-07	9590-904-0830	ND
2018-03-07	9590-905-0730	ND
2018-03-07	9590-906-0950	1.40 ppb
2018-03-07	9590-907-0925	2.10 ppb
2018-05-09	9590-900-0615	ND
2018-05-09	9590-901-0650	ND
2018-05-09	9590-902-0710	ND
2018-05-09	9590-903-0750	ND
2018-05-09	9590-904-0730	ND
2018-05-09	9590-905-0640	ND
2018-05-09	9590-906-0900	3.10 ppb
2018-05-09	9590-907-0830	3.40 ppb
2018-08-08	9590-900-0725	ND
2018-08-08	9590-901-0815	ND
2018-08-08	9590-902-0830	ND
2018-08-08	9590-903-0920	ND
2018-08-08	9590-904-0900	ND
2018-08-08	9590-905-0750	ND
2018-08-08	9590-906-1000	ND
2018-08-08	9590-907-1020	1.000 ppb
2018-11-01	4790-900-0845	ND
2018-11-01	4790-901-0900	ND
2018-11-01	4790-902-0840	ND
2018-11-01	4790-903-0800	ND
2018-11-01	4790-904-0820	ND
2018-11-01	4790-905-0915	ND
2018-11-01	4790-906-0710	1.90 ppb
2018-11-01	4790-907-0730	2.40 ppb
2019-02-12	4790-906-0945	ND
2019-02-12	4790-907-0840	1.40 ppb
2019-02-13	4790-900-0830	ND
2019-02-13	4790-901-0715	ND
2019-02-13	4790-902-0730	ND
2019-02-13	4790-903-0750	1.10 ppb
2019-02-13	4790-904-0810	ND
2019-02-13	4790-905-0700	ND
2019-05-08	4790-900-0720	1.000 ppb
2019-05-08	4790-901-0810	1.70 ppb
2019-05-08	4790-902-0840	2.60 ppb
2019-05-08	4790-903-0915	2.70 ppb
2019-05-08	4790-904-0900	1.90 ppb
2019-05-08	4790-905-0745	1.40 ppb
2019-05-08	4790-906-0945	3.60 ppb
2019-05-08	4790-907-1010	2.90 ppb
2019-08-14	4790-900-0740	ND
2019-08-14	4790-901-0820	ND
2019-08-14	4790-902-0840	1.000 ppb
2019-08-14	4790-903-0940	1.30 ppb
2019-08-14	4790-904-0915	ND
2019-08-14	4790-905-0800	ND
2019-08-14	4790-906-1015	1.000 ppb
2019-08-14	4790-907-1040	1.20 ppb
2019-11-06	4790-900-1110	ND
2019-11-06	4790-901-1035	1.50 ppb
2019-11-06	4790-902-1010	1.50 ppb
2019-11-06	4790-903-0915	1.70 ppb
2019-11-06	4790-904-0945	ND
2019-11-06	4790-905-1050	ND
2019-11-06	4790-906-0800	1.80 ppb
2019-11-06	4790-907-0825	2.30 ppb