Trichloroacetic acid

City of Clovis

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)

173

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	4.81 ppb	32	31	ND - 9.00 ppb
2015	4.86 ppb	32	31	ND - 9.40 ppb
2016	3.05 ppb	32	17	ND - 9.90 ppb
2017	5.73 ppb	32	31	ND - 10.00 ppb
2018	7.14 ppb	32	32	3.40 ppb - 14.0 ppb
2019	6.33 ppb	32	31	ND - 16.0 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
2014-03-10	5810-900-0943	6.70 ppb
2014-03-10	5810-901-0956	5.60 ppb
2014-03-10	5810-902-0905	4.90 ppb
2014-03-10	5810-903-0928	7.30 ppb
2014-03-10	5810-904-0918	5.80 ppb
2014-03-10	5810-905-0827	8.90 ppb
2014-03-10	5810-906-0841	9.00 ppb
2014-03-10	5810-907-0851	3.20 ppb
2014-06-09	5810-900-0937	3.90 ppb
2014-06-09	5810-901-0950	3.60 ppb
2014-06-09	5810-902-0903	3.10 ppb
2014-06-09	5810-903-0925	6.70 ppb
2014-06-09	5810-904-0915	3.20 ppb
2014-06-09	5810-905-0838	4.10 ppb
2014-06-09	5810-906-0853	2.50 ppb
2014-06-09	5810-907-0806	1.40 ppb
2014-09-10	5810-900-1039	4.00 ppb
2014-09-10	5810-901-1052	3.90 ppb
2014-09-10	5810-902-1007	3.30 ppb
2014-09-10	5810-903-1027	6.00 ppb
2014-09-10	5810-904-1018	3.90 ppb
2014-09-10	5810-905-0929	5.20 ppb
2014-09-10	5810-906-0942	4.10 ppb
2014-09-10	5810-907-0951	6.10 ppb
2014-12-10	5810-900-0937	5.70 ppb
2014-12-10	5810-901-0948	5.70 ppb
2014-12-10	5810-902-0859	5.90 ppb
2014-12-10	5810-903-0921	6.90 ppb
2014-12-10	5810-904-0910	5.80 ppb
2014-12-10	5810-905-0835	ND
2014-12-10	5810-906-0849	4.10 ppb
2014-12-10	5810-907-1010	3.40 ppb
2015-03-11	5810-900-0854	5.50 ppb
2015-03-11	5810-901-0829	5.50 ppb
2015-03-11	5810-902-1033	6.20 ppb
2015-03-11	5810-903-1056	5.60 ppb
2015-03-11	5810-904-1045	5.70 ppb
2015-03-11	5810-905-0958	6.70 ppb
2015-03-11	5810-906-1012	3.00 ppb
2015-03-11	5810-907-1024	3.40 ppb
2015-06-10	5810-900-0914	5.00 ppb
2015-06-10	5810-901-0926	4.80 ppb
2015-06-10	5810-902-0841	9.40 ppb
2015-06-10	5810-903-0902	6.00 ppb
2015-06-10	5810-904-0853	3.10 ppb
2015-06-10	5810-905-0807	6.30 ppb
2015-06-10	5810-906-0828	1.30 ppb
2015-06-10	5810-907-0751	ND
2015-09-09	5810-900-0902	4.50 ppb
2015-09-09	5810-901-0914	4.70 ppb
2015-09-09	5810-902-0830	3.80 ppb
2015-09-09	5810-903-0851	4.40 ppb
2015-09-09	5810-904-0841	3.90 ppb
2015-09-09	5810-905-0801	4.80 ppb
2015-09-09	5810-906-0819	4.20 ppb
2015-09-09	5810-907-0744	4.00 ppb
2015-12-09	5810-900-0941	5.70 ppb
2015-12-09	5810-901-0953	5.70 ppb
2015-12-09	5810-902-0823	6.00 ppb
2015-12-09	5810-903-0849	6.10 ppb
2015-12-09	5810-904-0839	5.50 ppb
2015-12-09	5810-905-0758	6.70 ppb
2015-12-09	5810-906-0812	5.10 ppb
2015-12-09	5810-907-1010	3.00 ppb
2016-03-16	5810-900-0955	ND
2016-03-16	5810-901-1006	ND
2016-03-16	5810-902-0908	ND
2016-03-16	5810-903-0846	ND
2016-03-16	5810-904-0920	ND
2016-03-16	5810-905-0928	ND
2016-03-16	5810-906-0858	ND
2016-03-16	5810-907-0818	5.10 ppb
2016-06-13	5810-900-0941	7.30 ppb
2016-06-13	5810-901-1007	7.40 ppb
2016-06-13	5810-902-0900	4.40 ppb
2016-06-13	5810-903-0948	9.90 ppb
2016-06-13	5810-904-0935	8.10 ppb
2016-06-13	5810-905-0900	7.50 ppb
2016-06-13	5810-906-0940	7.10 ppb
2016-06-13	5810-907-0919	6.30 ppb
2016-09-14	5810-900-1008	3.80 ppb
2016-09-14	5810-901-0808	4.00 ppb
2016-09-14	5810-902-0931	3.10 ppb
2016-09-14	5810-903-0849	5.60 ppb
2016-09-14	5810-904-0944	4.00 ppb
2016-09-14	5810-905-0953	4.20 ppb
2016-09-14	5810-906-0920	4.50 ppb
2016-09-14	5810-907-0907	5.30 ppb
2016-12-12	5810-900-0900	ND
2016-12-12	5810-901-0840	ND
2016-12-12	5810-902-0930	ND
2016-12-12	5810-903-0846	ND
2016-12-12	5810-904-0911	ND
2016-12-12	5810-905-0947	ND
2016-12-12	5810-906-0915	ND
2016-12-12	5810-907-0854	ND
2017-03-15	5810-900-0943	10.00 ppb
2017-03-15	5810-901-1000	10.00 ppb
2017-03-15	5810-902-0857	7.40 ppb
2017-03-15	5810-903-0928	10.00 ppb
2017-03-15	5810-904-0914	8.90 ppb
2017-03-15	5810-905-0805	10.00 ppb
2017-03-15	5810-906-0828	10.00 ppb
2017-03-15	5810-907-0842	ND
2017-06-12	5810-900-1024	6.80 ppb
2017-06-12	5810-901-1046	6.30 ppb
2017-06-12	5810-902-0921	4.70 ppb
2017-06-12	5810-903-1001	6.70 ppb
2017-06-12	5810-904-0940	5.20 ppb
2017-06-12	5810-905-0811	5.80 ppb
2017-06-12	5810-906-0838	5.70 ppb
2017-06-12	5810-907-0900	6.80 ppb
2017-09-11	5810-900-0859	3.70 ppb
2017-09-11	5810-901-0916	3.70 ppb
2017-09-11	5810-902-0804	3.20 ppb
2017-09-11	5810-903-0840	3.60 ppb
2017-09-11	5810-904-0823	3.20 ppb
2017-09-11	5810-905-0711	4.50 ppb
2017-09-11	5810-906-0731	3.40 ppb
2017-09-11	5810-907-0749	5.60 ppb
2017-11-27	5810-900-1246	4.40 ppb
2017-11-27	5810-901-1304	5.10 ppb
2017-11-27	5810-902-1154	3.90 ppb
2017-11-27	5810-903-1228	4.60 ppb
2017-11-27	5810-904-1214	4.00 ppb
2017-11-27	5810-905-1115	6.10 ppb
2017-11-27	5810-906-1134	4.30 ppb
2017-11-27	5810-907-1056	5.80 ppb
2018-03-14	5810-900-1011	7.50 ppb
2018-03-14	5810-901-1027	7.30 ppb
2018-03-14	5810-902-0918	6.00 ppb
2018-03-14	5810-903-0953	8.70 ppb
2018-03-14	5810-904-0939	6.60 ppb
2018-03-14	5810-905-0841	8.50 ppb
2018-03-14	5810-906-0858	7.70 ppb
2018-03-14	5810-907-0811	7.00 ppb
2018-06-13	5810-900-0837	8.80 ppb
2018-06-13	5810-901-0856	8.10 ppb
2018-06-13	5810-902-0745	6.20 ppb
2018-06-13	5810-903-0818	8.30 ppb
2018-06-13	5810-904-0805	6.50 ppb
2018-06-13	5810-905-0710	9.60 ppb
2018-06-13	5810-906-0727	12.0 ppb
2018-06-13	5810-907-0650	14.0 ppb
2018-09-11	5810-900-0831	4.10 ppb
2018-09-11	5810-901-0846	4.10 ppb
2018-09-11	5810-902-0743	3.40 ppb
2018-09-11	5810-903-0812	5.30 ppb
2018-09-11	5810-904-0800	3.50 ppb
2018-09-11	5810-905-0711	4.90 ppb
2018-09-11	5810-906-0727	5.00 ppb
2018-09-11	5810-907-0652	5.90 ppb
2018-10-24	5810-900-0921	10.00 ppb
2018-10-24	5810-901-0937	7.30 ppb
2018-10-24	5810-902-0839	4.80 ppb
2018-10-24	5810-903-0907	6.60 ppb
2018-10-24	5810-904-0855	5.80 ppb
2018-10-24	5810-905-0803	7.60 ppb
2018-10-24	5810-906-0822	8.00 ppb
2018-10-24	5810-907-0743	9.50 ppb
2019-03-13	5810-900-1001	15.0 ppb
2019-03-13	5810-901-1018	15.0 ppb
2019-03-13	5810-902-0914	14.0 ppb
2019-03-13	5810-903-0941	16.0 ppb
2019-03-13	5810-904-0931	15.0 ppb
2019-03-13	5810-905-0839	ND
2019-03-13	5810-906-0858	14.0 ppb
2019-03-13	5810-907-0821	7.00 ppb
2019-06-05	5810-900-0839	6.40 ppb
2019-06-05	5810-901-0856	6.60 ppb
2019-06-05	5810-902-0747	5.50 ppb
2019-06-05	5810-903-0821	6.10 ppb
2019-06-05	5810-904-0807	5.80 ppb
2019-06-05	5810-905-0707	2.10 ppb
2019-06-05	5810-906-0729	6.00 ppb
2019-06-05	5810-907-0645	9.90 ppb
2019-09-11	5810-900-0828	3.40 ppb
2019-09-11	5810-901-1021	3.20 ppb
2019-09-11	5810-902-0741	2.90 ppb
2019-09-11	5810-903-0813	3.40 ppb
2019-09-11	5810-904-0800	3.20 ppb
2019-09-11	5810-905-0708	4.60 ppb
2019-09-11	5810-906-0725	3.70 ppb
2019-09-11	5810-907-0646	5.40 ppb
2019-10-18	5810-900-0921	3.30 ppb
2019-10-18	5810-901-0944	3.70 ppb
2019-10-18	5810-902-0832	2.80 ppb
2019-10-18	5810-903-0904	3.70 ppb
2019-10-18	5810-904-0851	3.10 ppb
2019-10-18	5810-905-0758	3.20 ppb
2019-10-18	5810-906-0816	3.90 ppb
2019-10-18	5810-907-0735	4.50 ppb