Trichloroacetic acid

California Water Service Company - Dominguez

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

200

Samples

Samples exceeding legal limit (MCL)

180

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	4.94 ppb	32	32	1.20 ppb - 14.0 ppb
2015	3.73 ppb	32	31	ND - 11.0 ppb
2016	3.19 ppb	34	32	ND - 14.0 ppb
2017	4.74 ppb	33	27	ND - 14.0 ppb
2018	2.48 ppb	32	28	ND - 15.0 ppb
2019	2.94 ppb	37	30	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
2014-02-05	5810-800-1115	4.20 ppb
2014-02-05	5810-801-1038	12.0 ppb
2014-02-05	5810-802-1141	1.30 ppb
2014-02-05	5810-803-1305	4.00 ppb
2014-02-05	5810-804-1117	3.70 ppb
2014-02-05	5810-805-1145	3.90 ppb
2014-02-05	5810-806-1052	4.20 ppb
2014-02-05	5810-807-1024	3.90 ppb
2014-05-07	5810-800-1305	4.70 ppb
2014-05-07	5810-801-1339	11.0 ppb
2014-05-07	5810-802-1252	2.50 ppb
2014-05-07	5810-803-1148	4.40 ppb
2014-05-07	5810-804-1104	5.80 ppb
2014-05-07	5810-805-1118	5.10 ppb
2014-05-07	5810-806-1041	4.80 ppb
2014-05-07	5810-807-1025	4.60 ppb
2014-08-06	5810-800-1326	5.20 ppb
2014-08-06	5810-801-1413	14.0 ppb
2014-08-06	5810-802-1306	3.40 ppb
2014-08-06	5810-803-1134	5.30 ppb
2014-08-06	5810-804-1108	4.90 ppb
2014-08-06	5810-805-1134	4.90 ppb
2014-08-06	5810-806-1043	5.60 ppb
2014-08-06	5810-807-1018	4.90 ppb
2014-11-05	5810-800-1253	2.90 ppb
2014-11-05	5810-801-1329	12.0 ppb
2014-11-05	5810-802-1201	1.20 ppb
2014-11-05	5810-803-1133	2.70 ppb
2014-11-05	5810-804-1100	2.40 ppb
2014-11-05	5810-805-1123	2.70 ppb
2014-11-05	5810-806-1048	3.00 ppb
2014-11-05	5810-807-1507	2.90 ppb
2015-02-04	5810-800-1309	2.40 ppb
2015-02-04	5810-801-1351	9.40 ppb
2015-02-04	5810-802-1250	ND
2015-02-04	5810-803-1135	2.60 ppb
2015-02-04	5810-804-1111	1.80 ppb
2015-02-04	5810-805-1138	1.90 ppb
2015-02-04	5810-806-1045	2.30 ppb
2015-02-04	5810-807-1019	2.40 ppb
2015-05-06	5810-800-1323	4.20 ppb
2015-05-06	5810-801-1346	11.0 ppb
2015-05-06	5810-802-1307	2.20 ppb
2015-05-06	5810-803-1232	4.00 ppb
2015-05-06	5810-804-1110	4.40 ppb
2015-05-06	5810-805-1130	4.40 ppb
2015-05-06	5810-806-1041	4.20 ppb
2015-05-06	5810-807-1017	4.50 ppb
2015-08-05	5810-800-1330	4.10 ppb
2015-08-05	5810-801-1406	4.40 ppb
2015-08-05	5810-802-1317	1.80 ppb
2015-08-05	5810-803-1159	4.10 ppb
2015-08-05	5810-804-1052	4.00 ppb
2015-08-05	5810-805-1117	4.60 ppb
2015-08-05	5810-806-1029	5.00 ppb
2015-08-05	5810-807-0956	4.90 ppb
2015-11-04	5810-800-1317	2.80 ppb
2015-11-04	5810-801-1340	10.00 ppb
2015-11-04	5810-802-1301	1.50 ppb
2015-11-04	5810-803-1200	2.70 ppb
2015-11-04	5810-804-1111	2.10 ppb
2015-11-04	5810-805-1128	2.00 ppb
2015-11-04	5810-806-1037	1.80 ppb
2015-11-04	5810-807-1012	1.80 ppb
2016-02-03	5810-800-1109	2.40 ppb
2016-02-03	5810-801-1038	10.00 ppb
2016-02-03	5810-802-1124	1.10 ppb
2016-02-03	5810-803-1244	2.50 ppb
2016-02-03	5810-804-1101	2.50 ppb
2016-02-03	5810-805-1129	2.50 ppb
2016-02-03	5810-806-1033	2.20 ppb
2016-02-03	5810-807-1010	ND
2016-03-23	9590-018-1340	1.30 ppb
2016-05-04	5810-800-1305	2.80 ppb
2016-05-04	5810-801-1332	14.0 ppb
2016-05-04	5810-802-1248	2.90 ppb
2016-05-04	5810-803-1141	2.60 ppb
2016-05-04	5810-804-1057	3.10 ppb
2016-05-04	5810-805-1118	3.20 ppb
2016-05-04	5810-806-1026	2.70 ppb
2016-05-04	5810-807-1008	3.10 ppb
2016-08-03	5810-800-1308	4.10 ppb
2016-08-03	5810-801-1346	4.40 ppb
2016-08-03	5810-802-1246	3.00 ppb
2016-08-03	5810-803-1117	3.70 ppb
2016-08-03	5810-804-1110	4.70 ppb
2016-08-03	5810-805-1130	4.50 ppb
2016-08-03	5810-806-1045	2.60 ppb
2016-08-03	5810-807-1032	3.40 ppb
2016-11-09	5810-800-1048	2.50 ppb
2016-11-09	5810-801-1128	2.40 ppb
2016-11-09	5810-802-1154	1.80 ppb
2016-11-09	5810-803-1311	2.30 ppb
2016-11-09	5810-804-1040	2.70 ppb
2016-11-09	5810-805-1055	2.70 ppb
2016-11-09	5810-806-1023	2.40 ppb
2016-11-09	5810-807-1000	2.50 ppb
2016-12-28	9590-019-0930	ND
2017-02-08	5810-800-1333	6.10 ppb
2017-02-08	5810-801-1409	5.60 ppb
2017-02-08	5810-802-1321	1.90 ppb
2017-02-08	5810-803-1245	5.00 ppb
2017-02-08	5810-804-1124	3.30 ppb
2017-02-08	5810-805-1245	3.60 ppb
2017-02-08	5810-806-1159	6.40 ppb
2017-02-08	5810-807-1129	6.00 ppb
2017-03-08	9590-019-1430	ND
2017-05-03	5810-800-1155	11.0 ppb
2017-05-03	5810-801-1313	13.0 ppb
2017-05-03	5810-802-1143	7.50 ppb
2017-05-03	5810-803-1113	10.00 ppb
2017-05-03	5810-804-1126	8.30 ppb
2017-05-03	5810-805-1139	8.10 ppb
2017-05-03	5810-806-1106	10.00 ppb
2017-05-03	5810-807-1037	10.00 ppb
2017-08-09	5810-800-1144	3.20 ppb
2017-08-09	5810-801-1250	4.80 ppb
2017-08-09	5810-802-1131	2.40 ppb
2017-08-09	5810-803-1059	2.60 ppb
2017-08-09	5810-804-1130	3.10 ppb
2017-08-09	5810-805-1158	2.50 ppb
2017-08-09	5810-806-1110	2.80 ppb
2017-08-09	5810-807-1030	3.10 ppb
2017-11-08	5810-800-0904	ND
2017-11-08	5810-801-0929	14.0 ppb
2017-11-08	5810-802-0956	ND
2017-11-08	5810-803-1030	1.10 ppb
2017-11-08	5810-804-1027	ND
2017-11-08	5810-805-1054	1.10 ppb
2017-11-08	5810-806-0959	ND
2017-11-08	5810-807-0930	ND
2018-02-07	5810-800-1336	2.80 ppb
2018-02-07	5810-801-1304	12.0 ppb
2018-02-07	5810-802-1200	1.70 ppb
2018-02-07	5810-803-1127	2.10 ppb
2018-02-07	5810-804-1101	1.70 ppb
2018-02-07	5810-805-1120	1.30 ppb
2018-02-07	5810-806-1040	1.50 ppb
2018-02-07	5810-807-1020	2.30 ppb
2018-05-09	5810-800-1345	ND
2018-05-09	5810-801-1316	1.10 ppb
2018-05-09	5810-802-1219	ND
2018-05-09	5810-803-1127	2.00 ppb
2018-05-09	5810-804-1037	1.10 ppb
2018-05-09	5810-805-1110	1.10 ppb
2018-05-09	5810-806-1015	ND
2018-05-09	5810-807-1045	ND
2018-08-23	5810-800-1052	2.00 ppb
2018-08-23	5810-801-1112	12.0 ppb
2018-08-23	5810-802-1132	1.60 ppb
2018-08-23	5810-803-1200	2.50 ppb
2018-08-23	5810-804-0935	1.40 ppb
2018-08-23	5810-805-0948	1.60 ppb
2018-08-23	5810-806-1005	1.10 ppb
2018-08-23	5810-807-1035	2.20 ppb
2018-11-07	5810-800-1152	1.20 ppb
2018-11-07	5810-801-1242	15.0 ppb
2018-11-07	5810-802-1144	1.20 ppb
2018-11-07	5810-803-1103	2.20 ppb
2018-11-07	5810-804-1106	1.20 ppb
2018-11-07	5810-805-1515	1.20 ppb
2018-11-07	5810-806-1038	1.20 ppb
2018-11-07	5810-807-1013	1.20 ppb
2019-02-07	5810-800-1120	2.00 ppb
2019-02-07	5810-801-1100	2.00 ppb
2019-02-07	5810-802-1030	1.000 ppb
2019-02-07	5810-803-1140	2.30 ppb
2019-02-07	5810-804-1320	1.40 ppb
2019-02-07	5810-805-1340	1.30 ppb
2019-02-07	5810-806-1300	2.00 ppb
2019-02-07	5810-807-1230	ND
2019-02-21	9590-065-1345	ND
2019-05-08	5810-800-1236	1.40 ppb
2019-05-08	5810-801-1242	11.0 ppb
2019-05-08	5810-802-1146	ND
2019-05-08	5810-803-1103	1.70 ppb
2019-05-08	5810-804-1120	1.40 ppb
2019-05-08	5810-805-1150	1.30 ppb
2019-05-08	5810-806-1050	1.10 ppb
2019-05-08	5810-807-1010	1.20 ppb
2019-08-05	5810-800-1415	1.70 ppb
2019-08-05	5810-801-1426	1.70 ppb
2019-08-05	5810-802-1444	ND
2019-08-05	5810-803-1511	1.90 ppb
2019-08-05	5810-804-1345	1.20 ppb
2019-08-05	5810-805-1325	1.20 ppb
2019-08-05	5810-806-1530	1.40 ppb
2019-08-05	5810-807-1458	1.60 ppb
2019-10-30	9590-057-1135	12.0 ppb
2019-11-04	5810-800-0930	ND
2019-11-04	5810-801-0946	14.0 ppb
2019-11-04	5810-802-1045	ND
2019-11-04	5810-803-1320	1.80 ppb
2019-11-04	5810-804-1345	1.10 ppb
2019-11-04	5810-805-1400	1.10 ppb
2019-11-04	5810-806-0910	1.10 ppb
2019-11-04	5810-807-1256	ND
2019-11-06	9590-057-1010	12.0 ppb
2019-11-13	9590-057-1415	12.0 ppb
2019-11-20	9590-057-1101	12.0 ppb