Trichloroacetic acid

Irvine Ranch 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

276

Samples

Samples exceeding legal limit (MCL)

128

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	2.33 ppb	48	33	ND - 5.40 ppb
2015	0.981 ppb	36	15	ND - 4.10 ppb
2016	0.737 ppb	48	20	ND - 3.90 ppb
2017	0.970 ppb	48	22	ND - 4.40 ppb
2018	0.677 ppb	48	22	ND - 3.27 ppb
2019	0.994 ppb	48	16	ND - 11.6 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
2014-01-06	4317-805-0950	3.40 ppb
2014-01-06	4317-806-1257	2.80 ppb
2014-01-06	4317-811-1336	ND
2014-01-06	4317-812-1306	3.20 ppb
2014-01-07	4317-801-0858	1.30 ppb
2014-01-07	4317-802-0849	2.80 ppb
2014-01-07	4317-803-1235	ND
2014-01-07	4317-804-1115	ND
2014-01-07	4317-807-1051	1.10 ppb
2014-01-07	4317-808-0827	2.60 ppb
2014-01-07	4317-809-1328	2.60 ppb
2014-01-07	4317-810-1116	2.00 ppb
2014-04-07	4317-805-1134	4.60 ppb
2014-04-07	4317-806-1151	4.60 ppb
2014-04-07	4317-811-1211	ND
2014-04-07	4317-812-1131	3.50 ppb
2014-04-08	4317-801-0941	3.50 ppb
2014-04-08	4317-802-0928	5.00 ppb
2014-04-08	4317-803-1036	1.10 ppb
2014-04-08	4317-804-1109	4.20 ppb
2014-04-08	4317-807-1110	4.50 ppb
2014-04-08	4317-808-0853	4.00 ppb
2014-04-08	4317-809-1216	1.50 ppb
2014-04-08	4317-810-1147	4.70 ppb
2014-07-07	4317-805-0825	4.60 ppb
2014-07-07	4317-806-1332	4.40 ppb
2014-07-07	4317-809-1120	4.40 ppb
2014-07-07	4317-811-1357	ND
2014-07-07	4317-812-1325	3.90 ppb
2014-07-08	4317-801-1042	3.40 ppb
2014-07-08	4317-802-0828	4.60 ppb
2014-07-08	4317-803-1348	4.00 ppb
2014-07-08	4317-804-0928	3.40 ppb
2014-07-08	4317-807-1401	2.70 ppb
2014-07-08	4317-808-0751	5.20 ppb
2014-07-09	4317-810-1330	5.40 ppb
2014-10-06	4317-805-1200	ND
2014-10-06	4317-806-1402	1.30 ppb
2014-10-06	4317-809-1416	ND
2014-10-06	4317-811-0938	ND
2014-10-06	4317-812-1351	1.30 ppb
2014-10-07	4317-801-0913	ND
2014-10-07	4317-802-1136	ND
2014-10-07	4317-803-0923	ND
2014-10-07	4317-804-1154	ND
2014-10-07	4317-807-1000	ND
2014-10-07	4317-808-1102	ND
2014-10-07	4317-810-1102	ND
2015-01-05	4317-805-0842	ND
2015-01-05	4317-806-1126	1.10 ppb
2015-01-05	4317-809-1246	ND
2015-01-05	4317-811-1008	ND
2015-01-05	4317-812-1117	1.20 ppb
2015-01-06	4317-801-0910	2.00 ppb
2015-01-06	4317-803-1040	ND
2015-01-06	4317-807-0956	ND
2015-01-06	4317-810-1101	ND
2015-01-07	4317-802-0832	ND
2015-01-07	4317-804-0950	ND
2015-01-07	4317-808-0808	ND
2015-07-06	4317-802-1121	ND
2015-07-06	4317-804-1328	4.00 ppb
2015-07-06	4317-805-0815	4.10 ppb
2015-07-06	4317-806-1129	2.80 ppb
2015-07-06	4317-808-1040	2.20 ppb
2015-07-06	4317-809-1353	1.50 ppb
2015-07-06	4317-811-0930	ND
2015-07-06	4317-812-1120	3.20 ppb
2015-07-07	4317-801-0920	ND
2015-07-07	4317-803-1404	ND
2015-07-07	4317-807-1002	ND
2015-07-07	4317-810-1109	ND
2015-10-05	4317-805-0902	1.90 ppb
2015-10-05	4317-806-1058	3.50 ppb
2015-10-05	4317-809-1352	2.10 ppb
2015-10-05	4317-811-1200	ND
2015-10-05	4317-812-1049	2.50 ppb
2015-10-06	4317-801-0847	1.20 ppb
2015-10-06	4317-803-1040	ND
2015-10-06	4317-807-1252	ND
2015-10-06	4317-810-1103	ND
2015-10-08	4317-802-0748	ND
2015-10-08	4317-804-0800	2.00 ppb
2015-10-08	4317-808-0738	ND
2016-01-04	4317-802-0939	ND
2016-01-04	4317-804-1106	ND
2016-01-04	4317-806-1150	ND
2016-01-04	4317-808-0904	ND
2016-01-04	4317-809-1041	ND
2016-01-04	4317-811-1148	ND
2016-01-04	4317-812-1137	ND
2016-01-05	4317-801-0743	ND
2016-01-05	4317-810-1112	ND
2016-01-06	4317-803-0832	ND
2016-01-20	4317-805-1048	ND
2016-01-20	4317-807-1120	ND
2016-04-04	4317-803-1041	ND
2016-04-04	4317-806-1218	1.70 ppb
2016-04-04	4317-809-0838	ND
2016-04-04	4317-811-0925	ND
2016-04-04	4317-812-1204	1.40 ppb
2016-04-05	4317-801-1238	ND
2016-04-05	4317-802-0840	ND
2016-04-05	4317-804-1400	ND
2016-04-05	4317-805-1240	ND
2016-04-05	4317-807-0955	ND
2016-04-05	4317-808-0758	ND
2016-04-05	4317-810-1105	ND
2016-07-05	4317-803-1125	ND
2016-07-05	4317-805-1312	2.40 ppb
2016-07-05	4317-809-1319	2.60 ppb
2016-07-05	4317-811-1004	ND
2016-07-06	4317-802-1306	2.00 ppb
2016-07-06	4317-804-1335	1.90 ppb
2016-07-06	4317-806-1332	3.70 ppb
2016-07-06	4317-807-1052	1.40 ppb
2016-07-06	4317-808-1239	1.70 ppb
2016-07-06	4317-810-1122	1.10 ppb
2016-07-06	4317-812-1312	3.90 ppb
2016-07-07	4317-801-0826	1.40 ppb
2016-10-03	4317-802-0954	ND
2016-10-03	4317-803-1005	1.03 ppb
2016-10-03	4317-804-1218	1.05 ppb
2016-10-03	4317-806-1352	1.82 ppb
2016-10-03	4317-807-0926	ND
2016-10-03	4317-808-0923	ND
2016-10-03	4317-809-1117	1.14 ppb
2016-10-03	4317-810-1020	ND
2016-10-03	4317-811-0931	1.09 ppb
2016-10-03	4317-812-1337	1.73 ppb
2016-10-04	4317-801-1210	1.20 ppb
2016-10-04	4317-805-1335	1.10 ppb
2017-01-03	4317-802-1255	1.62 ppb
2017-01-03	4317-803-0900	ND
2017-01-03	4317-804-1445	2.47 ppb
2017-01-03	4317-805-1226	1.43 ppb
2017-01-03	4317-806-1059	2.75 ppb
2017-01-03	4317-807-1010	ND
2017-01-03	4317-808-1150	ND
2017-01-03	4317-809-1030	ND
2017-01-03	4317-810-1046	ND
2017-01-03	4317-811-0951	ND
2017-01-03	4317-812-1042	2.15 ppb
2017-01-04	4317-801-0959	ND
2017-04-03	4317-802-1005	ND
2017-04-03	4317-803-1148	1.82 ppb
2017-04-03	4317-804-1156	4.40 ppb
2017-04-03	4317-806-1050	1.89 ppb
2017-04-03	4317-807-1030	ND
2017-04-03	4317-808-0830	1.45 ppb
2017-04-03	4317-809-1110	1.29 ppb
2017-04-03	4317-810-1150	ND
2017-04-03	4317-811-0913	ND
2017-04-03	4317-812-1420	2.45 ppb
2017-04-04	4317-805-0919	1.01 ppb
2017-04-05	4317-801-0951	3.90 ppb
2017-07-05	4317-801-0932	2.38 ppb
2017-07-05	4317-803-1006	ND
2017-07-05	4317-804-1300	ND
2017-07-05	4317-805-1320	ND
2017-07-05	4317-806-1223	2.66 ppb
2017-07-05	4317-807-0835	ND
2017-07-05	4317-808-0905	ND
2017-07-05	4317-809-1416	ND
2017-07-05	4317-810-0912	ND
2017-07-05	4317-812-1208	2.91 ppb
2017-07-06	4317-802-1020	1.31 ppb
2017-07-06	4317-811-0910	1.05 ppb
2017-10-02	4317-802-1048	ND
2017-10-02	4317-803-1025	ND
2017-10-02	4317-804-1251	1.96 ppb
2017-10-02	4317-808-1006	ND
2017-10-02	4317-809-1226	ND
2017-10-02	4317-811-0935	ND
2017-10-03	4317-806-1052	ND
2017-10-03	4317-807-1119	ND
2017-10-03	4317-810-1155	1.03 ppb
2017-10-03	4317-812-1028	ND
2017-11-14	4317-801-1015	2.91 ppb
2017-11-14	4317-805-1412	1.71 ppb
2018-01-08	4317-801-1040	1.24 ppb
2018-01-08	4317-802-1145	ND
2018-01-08	4317-804-1435	2.34 ppb
2018-01-08	4317-806-0910	1.04 ppb
2018-01-08	4317-807-0933	ND
2018-01-08	4317-808-1004	ND
2018-01-08	4317-810-1007	ND
2018-01-08	4317-812-0853	1.21 ppb
2018-01-09	4317-803-0955	ND
2018-01-09	4317-805-1020	ND
2018-01-09	4317-809-1241	1.000 ppb
2018-01-09	4317-811-0959	1.69 ppb
2018-04-09	4317-805-1214	ND
2018-04-09	4317-806-1253	1.12 ppb
2018-04-09	4317-811-1027	ND
2018-04-09	4317-812-1228	1.09 ppb
2018-04-10	4317-801-1040	ND
2018-04-10	4317-802-0930	ND
2018-04-10	4317-803-0929	ND
2018-04-10	4317-804-1217	ND
2018-04-10	4317-807-1413	ND
2018-04-10	4317-808-0833	ND
2018-04-10	4317-809-0903	1.01 ppb
2018-04-10	4317-810-1344	ND
2018-07-09	4317-803-1010	ND
2018-07-09	4317-805-1010	1.39 ppb
2018-07-09	4317-807-1353	ND
2018-07-09	4317-809-0922	1.36 ppb
2018-07-09	4317-810-1427	ND
2018-07-09	4317-811-0846	ND
2018-07-10	4317-801-1023	2.35 ppb
2018-07-10	4317-802-1010	ND
2018-07-10	4317-804-1030	3.27 ppb
2018-07-10	4317-806-1035	1.80 ppb
2018-07-10	4317-808-0950	1.29 ppb
2018-07-10	4317-812-1028	1.81 ppb
2018-12-10	4317-801-1207	1.87 ppb
2018-12-10	4317-802-1035	ND
2018-12-10	4317-804-1305	1.01 ppb
2018-12-10	4317-805-1355	1.16 ppb
2018-12-10	4317-808-0957	ND
2018-12-11	4317-803-0909	ND
2018-12-11	4317-806-1052	ND
2018-12-11	4317-807-0850	1.09 ppb
2018-12-11	4317-809-0929	1.09 ppb
2018-12-11	4317-810-0925	ND
2018-12-11	4317-811-0911	ND
2018-12-11	4317-812-1030	1.27 ppb
2019-03-11	4317-802-1309	1.81 ppb
2019-03-11	4317-803-0938	ND
2019-03-11	4317-804-1321	1.83 ppb
2019-03-11	4317-805-1309	ND
2019-03-11	4317-806-1334	ND
2019-03-11	4317-807-1036	ND
2019-03-11	4317-808-1257	1.66 ppb
2019-03-11	4317-809-1220	ND
2019-03-11	4317-810-1112	1.01 ppb
2019-03-11	4317-811-0822	ND
2019-03-11	4317-812-1322	ND
2019-03-12	4317-801-1211	1.52 ppb
2019-04-08	4317-802-1134	ND
2019-04-08	4317-803-1008	ND
2019-04-08	4317-804-1030	1.64 ppb
2019-04-08	4317-806-1306	ND
2019-04-08	4317-807-1035	ND
2019-04-08	4317-808-1048	1.07 ppb
2019-04-08	4317-809-1224	ND
2019-04-08	4317-810-1137	1.56 ppb
2019-04-08	4317-811-0905	ND
2019-04-08	4317-812-1247	ND
2019-04-09	4317-801-0958	4.25 ppb
2019-04-09	4317-805-1120	ND
2019-07-08	4317-803-1245	ND
2019-07-08	4317-805-1013	ND
2019-07-08	4317-806-1427	ND
2019-07-08	4317-807-1150	ND
2019-07-08	4317-809-1219	ND
2019-07-08	4317-810-1235	ND
2019-07-08	4317-811-1054	ND
2019-07-08	4317-812-1410	ND
2019-07-09	4317-801-1224	4.40 ppb
2019-07-09	4317-802-1022	3.44 ppb
2019-07-09	4317-804-1411	11.6 ppb
2019-07-09	4317-808-0907	5.06 ppb
2019-10-07	4317-802-1155	ND
2019-10-07	4317-804-1354	1.21 ppb
2019-10-07	4317-806-1235	ND
2019-10-07	4317-808-1100	ND
2019-10-07	4317-811-1045	1.39 ppb
2019-10-07	4317-812-1214	ND
2019-10-08	4317-801-1252	4.24 ppb
2019-10-08	4317-803-1202	ND
2019-10-08	4317-807-0917	ND
2019-10-08	4317-809-0942	ND
2019-10-08	4317-810-1006	ND
2019-10-09	4317-805-1014	ND