Trichloroacetic acid

City of Santa Clara

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

208

Samples

Samples exceeding legal limit (MCL)

152

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	4.09 ppb	32	21	ND - 14.0 ppb
2015	3.99 ppb	32	19	ND - 11.0 ppb
2016	9.54 ppb	40	31	ND - 26.0 ppb
2017	7.67 ppb	32	26	ND - 22.0 ppb
2018	6.95 ppb	40	33	ND - 28.0 ppb
2019	4.49 ppb	32	22	ND - 14.0 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
2014-01-22	9590-900-1044	7.90 ppb
2014-01-22	9590-901-1030	5.20 ppb
2014-01-22	9590-902-1105	7.60 ppb
2014-01-22	9590-903-1015	ND
2014-01-22	9590-904-0935	ND
2014-01-22	9590-905-0834	ND
2014-01-22	9590-906-0854	1.30 ppb
2014-01-22	9590-907-0955	ND
2014-04-23	9590-900-1025	10.00 ppb
2014-04-23	9590-901-1010	12.0 ppb
2014-04-23	9590-902-1040	10.00 ppb
2014-04-23	9590-903-0955	2.30 ppb
2014-04-23	9590-904-0910	ND
2014-04-23	9590-905-0835	4.60 ppb
2014-04-23	9590-906-0850	3.60 ppb
2014-04-23	9590-907-0930	ND
2014-07-23	9590-900-1340	8.60 ppb
2014-07-23	9590-901-0905	ND
2014-07-23	9590-902-0945	11.0 ppb
2014-07-23	9590-903-0845	ND
2014-07-23	9590-904-1005	ND
2014-07-23	9590-905-1025	ND
2014-07-23	9590-906-1045	1.10 ppb
2014-07-23	9590-907-1130	1.20 ppb
2014-10-24	9590-900-0910	14.0 ppb
2014-10-24	9590-901-0930	12.0 ppb
2014-10-24	9590-902-0855	11.0 ppb
2014-10-24	9590-903-0915	2.30 ppb
2014-10-24	9590-904-1025	ND
2014-10-24	9590-905-0935	1.90 ppb
2014-10-24	9590-906-0955	1.70 ppb
2014-10-24	9590-907-1045	1.60 ppb
2015-01-21	9590-900-1215	10.00 ppb
2015-01-21	9590-901-1142	10.00 ppb
2015-01-21	9590-902-1126	10.00 ppb
2015-01-21	9590-903-1150	ND
2015-01-21	9590-904-0948	ND
2015-01-21	9590-905-1003	ND
2015-01-21	9590-906-1026	8.10 ppb
2015-01-21	9590-907-0926	3.20 ppb
2015-04-22	9590-900-0945	10.00 ppb
2015-04-22	9590-901-0915	11.0 ppb
2015-04-22	9590-902-1010	10.00 ppb
2015-04-22	9590-903-0858	ND
2015-04-22	9590-904-1125	1.20 ppb
2015-04-22	9590-905-1410	ND
2015-04-22	9590-906-1435	5.40 ppb
2015-04-22	9590-907-1140	ND
2015-07-23	9590-900-1410	9.30 ppb
2015-07-23	9590-901-1115	2.60 ppb
2015-07-23	9590-902-1345	9.20 ppb
2015-07-23	9590-903-1050	ND
2015-07-23	9590-904-0950	1.30 ppb
2015-07-23	9590-905-0850	1.40 ppb
2015-07-23	9590-906-0910	1.10 ppb
2015-07-23	9590-907-1015	ND
2015-10-21	9590-900-1321	11.0 ppb
2015-10-21	9590-901-1125	3.00 ppb
2015-10-21	9590-902-1340	10.00 ppb
2015-10-21	9590-903-1108	ND
2015-10-21	9590-904-1022	ND
2015-10-21	9590-905-0923	ND
2015-10-21	9590-906-0957	ND
2015-10-21	9590-907-1041	ND
2016-01-20	9590-900-1000	22.0 ppb
2016-01-20	9590-901-0935	16.0 ppb
2016-01-20	9590-902-1020	21.0 ppb
2016-01-20	9590-903-0915	1.30 ppb
2016-01-20	9590-904-1356	ND
2016-01-20	9590-905-1045	1.80 ppb
2016-01-20	9590-906-1102	2.60 ppb
2016-01-20	9590-907-1413	2.10 ppb
2016-01-27	9590-900-1127	25.0 ppb
2016-01-27	9590-901-1105	24.0 ppb
2016-01-27	9590-902-1146	26.0 ppb
2016-01-27	9590-903-1050	22.0 ppb
2016-01-27	9590-904-1206	ND
2016-01-27	9590-905-1218	ND
2016-01-27	9590-906-1232	3.10 ppb
2016-01-27	9590-907-1356	3.30 ppb
2016-04-20	9590-900-1021	23.0 ppb
2016-04-20	9590-901-1002	15.0 ppb
2016-04-20	9590-902-1043	21.0 ppb
2016-04-20	9590-903-0942	ND
2016-04-20	9590-904-1159	ND
2016-04-20	9590-905-1106	ND
2016-04-20	9590-906-1129	8.20 ppb
2016-04-20	9590-907-1224	6.40 ppb
2016-07-20	9590-900-1103	20.0 ppb
2016-07-20	9590-901-0827	19.0 ppb
2016-07-20	9590-902-0855	19.0 ppb
2016-07-20	9590-903-0809	7.20 ppb
2016-07-20	9590-904-1007	4.60 ppb
2016-07-20	9590-905-0925	6.50 ppb
2016-07-20	9590-906-0942	6.80 ppb
2016-07-20	9590-907-1022	ND
2016-10-26	9590-900-0927	15.0 ppb
2016-10-26	9590-901-0914	18.0 ppb
2016-10-26	9590-902-0940	16.0 ppb
2016-10-26	9590-903-0901	ND
2016-10-26	9590-904-1055	2.20 ppb
2016-10-26	9590-905-1003	ND
2016-10-26	9590-906-1021	1.60 ppb
2016-10-26	9590-907-1108	2.00 ppb
2017-01-25	9590-900-1128	2.80 ppb
2017-01-25	9590-901-1201	3.60 ppb
2017-01-25	9590-902-1054	2.80 ppb
2017-01-25	9590-903-1146	3.20 ppb
2017-01-25	9590-904-0959	ND
2017-01-25	9590-905-0852	ND
2017-01-25	9590-906-0915	1.90 ppb
2017-01-25	9590-907-1028	1.20 ppb
2017-04-19	9590-900-1200	22.0 ppb
2017-04-19	9590-901-1048	22.0 ppb
2017-04-19	9590-902-1219	22.0 ppb
2017-04-19	9590-903-1035	22.0 ppb
2017-04-19	9590-904-0952	ND
2017-04-19	9590-905-0838	ND
2017-04-19	9590-906-0903	2.30 ppb
2017-04-19	9590-907-1010	2.40 ppb
2017-08-02	9590-900-1053	17.0 ppb
2017-08-02	9590-901-1038	18.0 ppb
2017-08-02	9590-902-1118	19.0 ppb
2017-08-02	9590-903-1025	ND
2017-08-02	9590-904-0938	3.70 ppb
2017-08-02	9590-905-0841	4.20 ppb
2017-08-02	9590-906-0901	3.70 ppb
2017-08-02	9590-907-0953	ND
2017-10-18	9590-900-1014	12.0 ppb
2017-10-18	9590-901-0929	13.0 ppb
2017-10-18	9590-902-0959	11.0 ppb
2017-10-18	9590-903-0914	9.90 ppb
2017-10-18	9590-904-1144	6.80 ppb
2017-10-18	9590-905-1155	7.50 ppb
2017-10-18	9590-906-1253	7.20 ppb
2017-10-18	9590-907-1212	4.10 ppb
2018-01-29	9590-900-0755	12.0 ppb
2018-01-29	9590-901-0843	11.0 ppb
2018-01-29	9590-902-0817	11.0 ppb
2018-01-29	9590-903-0832	6.20 ppb
2018-01-29	9590-904-1008	ND
2018-01-29	9590-905-0909	ND
2018-01-29	9590-906-0928	1.50 ppb
2018-01-29	9590-907-1023	1.50 ppb
2018-04-17	9590-900-0942	28.0 ppb
2018-04-17	9590-901-0924	19.0 ppb
2018-04-17	9590-902-1014	5.50 ppb
2018-04-17	9590-903-0910	7.90 ppb
2018-04-17	9590-904-1034	1.10 ppb
2018-04-17	9590-905-1048	ND
2018-04-17	9590-906-1107	10.00 ppb
2018-04-17	9590-907-1135	11.0 ppb
2018-04-26	9590-900-0940	18.0 ppb
2018-04-26	9590-901-0849	17.0 ppb
2018-04-26	9590-902-1003	5.10 ppb
2018-04-26	9590-903-0835	2.00 ppb
2018-04-26	9590-904-1101	1.90 ppb
2018-04-26	9590-905-1026	ND
2018-04-26	9590-906-1042	3.40 ppb
2018-04-26	9590-907-1115	ND
2018-07-25	9590-900-0900	15.0 ppb
2018-07-25	9590-901-0848	16.0 ppb
2018-07-25	9590-902-0915	1.20 ppb
2018-07-25	9590-903-0838	15.0 ppb
2018-07-25	9590-904-1015	3.30 ppb
2018-07-25	9590-905-0939	ND
2018-07-25	9590-906-0954	3.50 ppb
2018-07-25	9590-907-1027	3.00 ppb
2018-10-17	9590-900-0930	12.0 ppb
2018-10-17	9590-901-0904	11.0 ppb
2018-10-17	9590-902-0946	12.0 ppb
2018-10-17	9590-903-0850	7.00 ppb
2018-10-17	9590-904-1007	1.70 ppb
2018-10-17	9590-905-1019	2.00 ppb
2018-10-17	9590-906-1054	2.00 ppb
2018-10-17	9590-907-1117	ND
2019-01-16	9590-900-0957	3.00 ppb
2019-01-16	9590-901-0934	2.90 ppb
2019-01-16	9590-902-1016	ND
2019-01-16	9590-903-0924	2.80 ppb
2019-01-16	9590-904-0741	1.40 ppb
2019-01-16	9590-905-0753	2.10 ppb
2019-01-16	9590-906-0809	2.00 ppb
2019-01-16	9590-907-0852	ND
2019-04-17	9590-900-0934	11.0 ppb
2019-04-17	9590-901-0918	13.0 ppb
2019-04-17	9590-902-0949	ND
2019-04-17	9590-903-0906	12.0 ppb
2019-04-17	9590-904-1012	ND
2019-04-17	9590-905-1028	ND
2019-04-17	9590-906-1055	1.90 ppb
2019-04-17	9590-907-1119	2.00 ppb
2019-07-15	9590-900-1116	12.0 ppb
2019-07-15	9590-901-1056	14.0 ppb
2019-07-15	9590-902-1129	13.0 ppb
2019-07-15	9590-903-1040	ND
2019-07-15	9590-904-0949	1.90 ppb
2019-07-15	9590-905-1009	1.90 ppb
2019-07-15	9590-906-0926	1.90 ppb
2019-07-15	9590-907-0843	ND
2019-10-15	9590-900-0814	12.0 ppb
2019-10-15	9590-901-0758	10.00 ppb
2019-10-15	9590-902-0834	11.0 ppb
2019-10-15	9590-903-0745	ND
2019-10-15	9590-904-1017	4.10 ppb
2019-10-15	9590-905-0941	ND
2019-10-15	9590-906-0958	7.70 ppb
2019-10-15	9590-907-1028	ND