Trichloroacetic acid

California Water Service Company - Palos Verde

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)

127

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	4.14 ppb	32	32	1.90 ppb - 5.80 ppb
2015	2.28 ppb	32	27	ND - 4.40 ppb
2016	1.60 ppb	32	28	ND - 3.30 ppb
2017	2.06 ppb	32	15	ND - 13.0 ppb
2018	0.678 ppb	32	16	ND - 2.70 ppb
2019	0.581 ppb	32	9	ND - 2.30 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
2014-02-18	5810-800-1048	3.90 ppb
2014-02-18	5810-801-1105	3.80 ppb
2014-02-18	5810-802-1335	4.00 ppb
2014-02-18	5810-803-1535	3.90 ppb
2014-02-18	5810-804-1455	3.80 ppb
2014-02-18	5810-805-1305	3.90 ppb
2014-02-18	5810-806-1542	4.00 ppb
2014-02-18	5810-807-1145	4.20 ppb
2014-05-21	5810-800-1118	5.00 ppb
2014-05-21	5810-801-1200	5.20 ppb
2014-05-21	5810-802-1305	4.80 ppb
2014-05-21	5810-803-1250	4.80 ppb
2014-05-21	5810-804-1330	4.50 ppb
2014-05-21	5810-805-1225	5.00 ppb
2014-05-21	5810-806-1300	4.90 ppb
2014-05-21	5810-807-1210	4.60 ppb
2014-08-19	5810-800-1150	5.80 ppb
2014-08-19	5810-801-1135	5.80 ppb
2014-08-19	5810-802-1030	5.30 ppb
2014-08-19	5810-803-0945	5.20 ppb
2014-08-19	5810-804-0930	5.10 ppb
2014-08-19	5810-805-1045	5.40 ppb
2014-08-19	5810-806-1010	5.80 ppb
2014-08-19	5810-807-1110	4.80 ppb
2014-11-18	5810-800-1140	2.80 ppb
2014-11-18	5810-801-1150	1.90 ppb
2014-11-18	5810-802-1110	2.10 ppb
2014-11-18	5810-803-1220	2.40 ppb
2014-11-18	5810-804-0944	2.40 ppb
2014-11-18	5810-805-1030	2.20 ppb
2014-11-18	5810-806-1010	2.50 ppb
2014-11-18	5810-807-1050	2.60 ppb
2015-02-18	5810-800-1520	2.70 ppb
2015-02-18	5810-801-1150	2.70 ppb
2015-02-18	5810-802-1500	2.20 ppb
2015-02-18	5810-803-1300	2.30 ppb
2015-02-18	5810-804-1415	2.20 ppb
2015-02-18	5810-805-1215	2.10 ppb
2015-02-18	5810-806-1430	2.30 ppb
2015-02-18	5810-807-1240	2.20 ppb
2015-05-19	5810-800-1040	4.40 ppb
2015-05-19	5810-801-1107	3.40 ppb
2015-05-19	5810-802-1257	3.80 ppb
2015-05-19	5810-803-1358	3.70 ppb
2015-05-19	5810-804-1330	4.00 ppb
2015-05-19	5810-805-1232	3.90 ppb
2015-05-19	5810-806-1427	3.70 ppb
2015-05-19	5810-807-1143	3.80 ppb
2015-08-17	5810-800-0943	ND
2015-08-17	5810-801-0959	3.60 ppb
2015-08-17	5810-802-1100	4.30 ppb
2015-08-17	5810-803-1435	4.30 ppb
2015-08-17	5810-804-1120	ND
2015-08-17	5810-805-1046	ND
2015-08-17	5810-806-1449	ND
2015-08-17	5810-807-1025	ND
2015-11-19	5810-800-1029	2.40 ppb
2015-11-19	5810-801-1040	1.10 ppb
2015-11-19	5810-802-1141	1.30 ppb
2015-11-19	5810-803-1308	1.20 ppb
2015-11-19	5810-804-1207	1.20 ppb
2015-11-19	5810-805-1126	1.40 ppb
2015-11-19	5810-806-1328	1.50 ppb
2015-11-19	5810-807-1108	1.20 ppb
2016-02-17	5810-800-1527	2.00 ppb
2016-02-17	5810-801-1517	1.90 ppb
2016-02-17	5810-802-1425	1.90 ppb
2016-02-17	5810-803-1442	2.00 ppb
2016-02-17	5810-804-1350	2.00 ppb
2016-02-17	5810-805-1436	1.90 ppb
2016-02-17	5810-806-1417	1.80 ppb
2016-02-17	5810-807-1450	2.00 ppb
2016-05-17	5810-800-0928	2.80 ppb
2016-05-17	5810-801-0905	1.80 ppb
2016-05-17	5810-802-1057	1.90 ppb
2016-05-17	5810-803-1020	2.10 ppb
2016-05-17	5810-804-1125	2.00 ppb
2016-05-17	5810-805-1015	1.90 ppb
2016-05-17	5810-806-0925	2.20 ppb
2016-05-17	5810-807-1050	2.10 ppb
2016-08-15	5810-800-1024	3.30 ppb
2016-08-15	5810-801-1045	ND
2016-08-15	5810-802-1155	ND
2016-08-15	5810-803-1243	1.10 ppb
2016-08-15	5810-804-1313	1.30 ppb
2016-08-15	5810-805-1140	ND
2016-08-15	5810-806-1258	1.60 ppb
2016-08-15	5810-807-1115	ND
2016-11-21	5810-800-0935	1.60 ppb
2016-11-21	5810-801-0947	1.40 ppb
2016-11-21	5810-802-1117	1.30 ppb
2016-11-21	5810-803-1408	1.80 ppb
2016-11-21	5810-804-1139	1.50 ppb
2016-11-21	5810-805-1104	1.30 ppb
2016-11-21	5810-806-1426	1.30 ppb
2016-11-21	5810-807-1026	1.30 ppb
2017-02-21	5810-804-1259	2.80 ppb
2017-02-21	5810-805-1230	2.90 ppb
2017-02-21	5810-806-1450	9.40 ppb
2017-02-21	5810-807-1141	2.40 ppb
2017-02-22	5810-800-0908	13.0 ppb
2017-02-22	5810-801-0921	3.20 ppb
2017-02-22	5810-802-0949	8.10 ppb
2017-02-22	5810-803-1006	2.80 ppb
2017-05-16	5810-800-0925	6.40 ppb
2017-05-16	5810-801-0950	2.40 ppb
2017-05-16	5810-802-1120	ND
2017-05-16	5810-803-1200	1.000 ppb
2017-05-16	5810-804-1140	1.80 ppb
2017-05-16	5810-805-1100	1.20 ppb
2017-05-16	5810-806-1300	7.20 ppb
2017-05-16	5810-807-1040	ND
2017-08-21	5810-800-1039	ND
2017-08-21	5810-801-1022	ND
2017-08-21	5810-802-1146	ND
2017-08-21	5810-803-0954	ND
2017-08-21	5810-804-0915	ND
2017-08-21	5810-805-1310	ND
2017-08-21	5810-806-1016	ND
2017-08-21	5810-807-1340	ND
2017-11-20	5810-800-0920	ND
2017-11-20	5810-801-0940	ND
2017-11-20	5810-802-1000	ND
2017-11-20	5810-803-1020	ND
2017-11-20	5810-804-1100	ND
2017-11-20	5810-805-1130	ND
2017-11-20	5810-806-1040	ND
2017-11-20	5810-807-1155	1.20 ppb
2018-02-22	5810-800-0930	ND
2018-02-22	5810-801-0948	ND
2018-02-22	5810-802-1105	ND
2018-02-22	5810-803-1120	ND
2018-02-22	5810-804-1515	1.000 ppb
2018-02-22	5810-805-1042	ND
2018-02-22	5810-806-1418	ND
2018-02-22	5810-807-1017	ND
2018-05-21	5810-800-1040	1.000 ppb
2018-05-21	5810-801-1051	1.000 ppb
2018-05-21	5810-802-1200	ND
2018-05-21	5810-803-1411	1.000 ppb
2018-05-21	5810-804-1339	ND
2018-05-21	5810-805-1148	ND
2018-05-21	5810-806-1440	1.10 ppb
2018-05-21	5810-807-1114	1.000 ppb
2018-08-23	5810-800-1250	2.70 ppb
2018-08-23	5810-801-1305	1.80 ppb
2018-08-23	5810-802-1335	2.00 ppb
2018-08-23	5810-803-1350	1.70 ppb
2018-08-23	5810-804-1442	ND
2018-08-23	5810-805-1500	ND
2018-08-23	5810-806-1412	1.40 ppb
2018-08-23	5810-807-1520	1.10 ppb
2018-11-19	5810-800-1115	1.60 ppb
2018-11-19	5810-801-1133	ND
2018-11-19	5810-802-1153	ND
2018-11-19	5810-803-1210	1.10 ppb
2018-11-19	5810-804-0900	1.10 ppb
2018-11-19	5810-805-0918	ND
2018-11-19	5810-806-0942	1.10 ppb
2018-11-19	5810-807-1001	ND
2019-02-21	5810-800-0954	2.10 ppb
2019-02-21	5810-801-1023	2.20 ppb
2019-02-21	5810-802-1140	2.00 ppb
2019-02-21	5810-803-1325	2.10 ppb
2019-02-21	5810-804-1245	2.00 ppb
2019-02-21	5810-805-1115	2.30 ppb
2019-02-21	5810-806-1433	2.10 ppb
2019-02-21	5810-807-1047	2.10 ppb
2019-05-23	5810-800-1038	ND
2019-05-23	5810-801-1113	ND
2019-05-23	5810-802-1319	ND
2019-05-23	5810-803-1409	ND
2019-05-23	5810-804-1334	ND
2019-05-23	5810-805-1257	ND
2019-05-23	5810-806-1428	ND
2019-05-23	5810-807-1140	ND
2019-08-22	5810-800-1103	ND
2019-08-22	5810-801-1130	1.70 ppb
2019-08-22	5810-802-1331	ND
2019-08-22	5810-803-1438	ND
2019-08-22	5810-804-1418	ND
2019-08-22	5810-805-1313	ND
2019-08-22	5810-806-1506	ND
2019-08-22	5810-807-1249	ND
2019-11-18	5810-800-0920	ND
2019-11-18	5810-801-0936	ND
2019-11-18	5810-802-1108	ND
2019-11-18	5810-803-1220	ND
2019-11-18	5810-804-1201	ND
2019-11-18	5810-805-1040	ND
2019-11-18	5810-806-1238	ND
2019-11-18	5810-807-1008	ND