Trichloroacetic acid

City of Torrance Water Department

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)

112

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	2.00 ppb	32	24	ND - 5.30 ppb
2015	1.63 ppb	32	22	ND - 4.00 ppb
2016	1.80 ppb	32	23	ND - 4.50 ppb
2017	1.99 ppb	32	20	ND - 6.90 ppb
2018	0.428 ppb	32	12	ND - 1.60 ppb
2019	0.406 ppb	32	11	ND - 1.60 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
2014-03-04	3761-800-1058	ND
2014-03-04	3761-801-1215	1.80 ppb
2014-03-04	3761-802-1134	ND
2014-03-04	3761-803-1112	1.40 ppb
2014-03-04	3761-804-1047	ND
2014-03-04	3761-805-1224	1.80 ppb
2014-03-04	3761-806-1034	1.90 ppb
2014-03-04	3761-807-1149	2.70 ppb
2014-06-05	3761-800-1050	ND
2014-06-05	3761-801-0905	5.10 ppb
2014-06-05	3761-802-0840	5.20 ppb
2014-06-05	3761-803-1035	ND
2014-06-05	3761-804-1105	1.10 ppb
2014-06-05	3761-805-1005	4.50 ppb
2014-06-05	3761-806-1120	3.40 ppb
2014-06-05	3761-807-0820	5.30 ppb
2014-09-11	3761-800-0900	1.20 ppb
2014-09-11	3761-801-1020	3.40 ppb
2014-09-11	3761-802-1230	2.70 ppb
2014-09-11	3761-803-0910	ND
2014-09-11	3761-804-0920	ND
2014-09-11	3761-805-1025	3.60 ppb
2014-09-11	3761-806-0950	3.70 ppb
2014-09-11	3761-807-1250	3.50 ppb
2014-12-09	3761-800-1025	1.60 ppb
2014-12-09	3761-801-0915	1.10 ppb
2014-12-09	3761-802-1020	1.90 ppb
2014-12-09	3761-803-1100	1.90 ppb
2014-12-09	3761-804-1040	1.90 ppb
2014-12-09	3761-805-0925	ND
2014-12-09	3761-806-1300	1.40 ppb
2014-12-09	3761-807-1005	2.00 ppb
2015-03-23	3761-800-0955	2.30 ppb
2015-03-23	3761-801-1035	2.10 ppb
2015-03-23	3761-802-1400	2.30 ppb
2015-03-23	3761-803-0925	2.30 ppb
2015-03-23	3761-804-0935	2.40 ppb
2015-03-23	3761-805-1320	2.00 ppb
2015-03-23	3761-806-0945	2.40 ppb
2015-03-23	3761-807-1345	2.30 ppb
2015-06-18	3761-800-0910	ND
2015-06-18	3761-801-0955	2.20 ppb
2015-06-18	3761-802-1235	1.10 ppb
2015-06-18	3761-803-0915	ND
2015-06-18	3761-804-0925	ND
2015-06-18	3761-805-1000	2.10 ppb
2015-06-18	3761-806-0933	2.70 ppb
2015-06-18	3761-807-1023	2.90 ppb
2015-09-03	3761-800-0825	ND
2015-09-03	3761-801-0925	3.70 ppb
2015-09-03	3761-802-1010	1.10 ppb
2015-09-03	3761-803-0840	ND
2015-09-03	3761-804-0847	ND
2015-09-03	3761-805-0930	4.00 ppb
2015-09-03	3761-806-0858	3.80 ppb
2015-09-03	3761-807-0955	3.60 ppb
2015-12-08	3761-800-0855	ND
2015-12-08	3761-801-1007	1.80 ppb
2015-12-08	3761-802-1050	ND
2015-12-08	3761-803-0905	ND
2015-12-08	3761-804-0911	ND
2015-12-08	3761-805-1015	1.90 ppb
2015-12-08	3761-806-0921	1.60 ppb
2015-12-08	3761-807-1035	1.50 ppb
2016-03-09	3761-800-0900	ND
2016-03-09	3761-801-0947	ND
2016-03-09	3761-802-1009	ND
2016-03-09	3761-803-0910	ND
2016-03-09	3761-804-0917	ND
2016-03-09	3761-805-0953	ND
2016-03-09	3761-806-0926	ND
2016-03-09	3761-807-1040	ND
2016-06-08	3761-800-0855	2.50 ppb
2016-06-08	3761-801-0942	2.60 ppb
2016-06-08	3761-802-1020	2.80 ppb
2016-06-08	3761-803-0905	2.50 ppb
2016-06-08	3761-804-0915	2.90 ppb
2016-06-08	3761-805-0950	3.20 ppb
2016-06-08	3761-806-0925	3.00 ppb
2016-06-08	3761-807-1035	3.00 ppb
2016-09-07	3761-800-0850	2.40 ppb
2016-09-07	3761-801-0950	ND
2016-09-07	3761-802-1040	3.90 ppb
2016-09-07	3761-803-0900	2.60 ppb
2016-09-07	3761-804-0907	2.90 ppb
2016-09-07	3761-805-1000	1.50 ppb
2016-09-07	3761-806-0920	4.50 ppb
2016-09-07	3761-807-1026	4.20 ppb
2016-12-07	3761-800-0906	1.50 ppb
2016-12-07	3761-801-1010	1.60 ppb
2016-12-07	3761-802-1100	1.50 ppb
2016-12-07	3761-803-0915	1.60 ppb
2016-12-07	3761-804-0924	1.70 ppb
2016-12-07	3761-805-1015	1.70 ppb
2016-12-07	3761-806-0945	1.60 ppb
2016-12-07	3761-807-1035	1.80 ppb
2017-03-07	3761-800-0935	ND
2017-03-07	3761-801-1030	5.30 ppb
2017-03-07	3761-802-1115	3.30 ppb
2017-03-07	3761-803-0945	ND
2017-03-07	3761-804-1010	1.30 ppb
2017-03-07	3761-805-1040	6.30 ppb
2017-03-07	3761-806-1000	5.90 ppb
2017-03-07	3761-807-1100	6.90 ppb
2017-06-06	3761-800-0910	ND
2017-06-06	3761-801-1003	2.90 ppb
2017-06-06	3761-802-1041	2.50 ppb
2017-06-06	3761-803-0920	1.10 ppb
2017-06-06	3761-804-0927	ND
2017-06-06	3761-805-1009	3.40 ppb
2017-06-06	3761-806-0936	1.80 ppb
2017-06-06	3761-807-1029	2.40 ppb
2017-09-12	3761-800-0905	ND
2017-09-12	3761-801-0958	4.60 ppb
2017-09-12	3761-802-1053	2.50 ppb
2017-09-12	3761-803-0915	1.000 ppb
2017-09-12	3761-804-0925	ND
2017-09-12	3761-805-1005	3.40 ppb
2017-09-12	3761-806-0935	4.10 ppb
2017-09-12	3761-807-1027	2.80 ppb
2017-12-13	3761-800-0940	1.10 ppb
2017-12-13	3761-801-1027	ND
2017-12-13	3761-802-1243	ND
2017-12-13	3761-803-0949	ND
2017-12-13	3761-804-1000	1.000 ppb
2017-12-13	3761-805-1033	ND
2017-12-13	3761-806-1006	ND
2017-12-13	3761-807-1300	ND
2018-03-14	3761-800-1002	ND
2018-03-14	3761-801-1135	ND
2018-03-14	3761-802-1110	ND
2018-03-14	3761-803-1013	ND
2018-03-14	3761-804-0951	1.000 ppb
2018-03-14	3761-805-1131	ND
2018-03-14	3761-806-0937	ND
2018-03-14	3761-807-1100	ND
2018-06-27	3761-800-0805	ND
2018-06-27	3761-801-0850	1.60 ppb
2018-06-27	3761-802-0949	1.20 ppb
2018-06-27	3761-803-0800	ND
2018-06-27	3761-804-0815	ND
2018-06-27	3761-805-0900	1.10 ppb
2018-06-27	3761-806-0825	1.60 ppb
2018-06-27	3761-807-0925	1.10 ppb
2018-09-17	3761-800-0805	ND
2018-09-17	3761-801-0915	ND
2018-09-17	3761-802-1025	1.000 ppb
2018-09-17	3761-803-0730	ND
2018-09-17	3761-804-0815	ND
2018-09-17	3761-805-0925	ND
2018-09-17	3761-806-0825	1.000 ppb
2018-09-17	3761-807-1010	1.10 ppb
2018-12-04	3761-800-0925	1.000 ppb
2018-12-04	3761-801-0845	ND
2018-12-04	3761-802-0815	ND
2018-12-04	3761-803-0950	ND
2018-12-04	3761-804-0920	1.000 ppb
2018-12-04	3761-805-0835	ND
2018-12-04	3761-806-0910	1.000 ppb
2018-12-04	3761-807-0800	ND
2019-03-20	3761-800-0825	1.10 ppb
2019-03-20	3761-801-0905	ND
2019-03-20	3761-802-1000	ND
2019-03-20	3761-803-0745	ND
2019-03-20	3761-804-0800	1.10 ppb
2019-03-20	3761-805-0915	ND
2019-03-20	3761-806-0810	1.30 ppb
2019-03-20	3761-807-0945	1.000 ppb
2019-06-25	3761-800-0820	1.000 ppb
2019-06-25	3761-801-0910	ND
2019-06-25	3761-802-0950	ND
2019-06-25	3761-803-0810	1.000 ppb
2019-06-25	3761-804-0830	ND
2019-06-25	3761-805-0900	ND
2019-06-25	3761-806-0840	ND
2019-06-25	3761-807-0930	ND
2019-09-18	3761-800-0745	1.20 ppb
2019-09-18	3761-801-0830	ND
2019-09-18	3761-802-0930	ND
2019-09-18	3761-803-0735	ND
2019-09-18	3761-804-0755	ND
2019-09-18	3761-805-0840	ND
2019-09-18	3761-806-0805	ND
2019-09-18	3761-807-0911	ND
2019-12-11	3761-800-0800	1.60 ppb
2019-12-11	3761-801-0845	ND
2019-12-11	3761-802-0940	ND
2019-12-11	3761-803-0745	1.10 ppb
2019-12-11	3761-804-0810	1.60 ppb
2019-12-11	3761-805-0855	ND
2019-12-11	3761-806-0825	1.000 ppb
2019-12-11	3761-807-0925	ND