Trichloroacetic acid

California Water Service Company - Hermosa / Redondo Beach

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

195

Samples

Samples exceeding legal limit (MCL)

149

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	3.10 ppb	32	29	ND - 5.00 ppb
2015	3.07 ppb	32	29	ND - 6.00 ppb
2016	2.29 ppb	32	30	ND - 3.80 ppb
2017	3.18 ppb	32	27	ND - 9.60 ppb
2018	0.800 ppb	35	18	ND - 2.10 ppb
2019	0.872 ppb	32	16	ND - 3.00 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
2014-03-04	5810-800-1155	3.30 ppb
2014-03-04	5810-801-0921	3.30 ppb
2014-03-04	5810-802-0910	3.50 ppb
2014-03-04	5810-803-1419	2.40 ppb
2014-03-04	5810-804-0848	2.80 ppb
2014-03-04	5810-805-1504	3.40 ppb
2014-03-04	5810-806-1035	3.20 ppb
2014-03-04	5810-807-1428	3.70 ppb
2014-06-03	5810-800-1242	4.50 ppb
2014-06-03	5810-801-0947	5.00 ppb
2014-06-03	5810-802-0935	5.00 ppb
2014-06-03	5810-803-1437	1.50 ppb
2014-06-03	5810-804-0912	4.70 ppb
2014-06-03	5810-805-1525	4.70 ppb
2014-06-03	5810-806-1052	4.70 ppb
2014-06-03	5810-807-1448	ND
2014-09-02	5810-800-1300	4.20 ppb
2014-09-02	5810-801-1025	4.40 ppb
2014-09-02	5810-802-1010	4.30 ppb
2014-09-02	5810-803-1500	ND
2014-09-02	5810-804-0940	4.20 ppb
2014-09-02	5810-805-1525	4.30 ppb
2014-09-02	5810-806-1130	4.20 ppb
2014-09-02	5810-807-1445	ND
2014-12-02	5810-800-1335	2.30 ppb
2014-12-02	5810-801-1050	2.30 ppb
2014-12-02	5810-802-1037	2.50 ppb
2014-12-02	5810-803-1318	1.70 ppb
2014-12-02	5810-804-1012	2.40 ppb
2014-12-02	5810-805-1421	2.20 ppb
2014-12-02	5810-806-1015	2.40 ppb
2014-12-02	5810-807-1336	2.20 ppb
2015-03-03	5810-800-1150	2.60 ppb
2015-03-03	5810-801-0946	2.60 ppb
2015-03-03	5810-802-0934	2.20 ppb
2015-03-03	5810-803-1431	2.10 ppb
2015-03-03	5810-804-0957	2.30 ppb
2015-03-03	5810-805-1521	2.60 ppb
2015-03-03	5810-806-1056	2.30 ppb
2015-03-03	5810-807-1446	2.30 ppb
2015-06-02	5810-800-1242	3.60 ppb
2015-06-02	5810-801-1051	3.80 ppb
2015-06-02	5810-802-1034	3.70 ppb
2015-06-02	5810-803-1443	3.40 ppb
2015-06-02	5810-804-0932	3.90 ppb
2015-06-02	5810-805-1520	3.70 ppb
2015-06-02	5810-806-1131	3.70 ppb
2015-06-02	5810-807-1533	ND
2015-09-08	5810-800-1144	5.90 ppb
2015-09-08	5810-801-1000	5.60 ppb
2015-09-08	5810-802-0943	5.60 ppb
2015-09-08	5810-803-1405	3.50 ppb
2015-09-08	5810-804-0915	5.80 ppb
2015-09-08	5810-805-1448	5.80 ppb
2015-09-08	5810-806-1053	6.00 ppb
2015-09-08	5810-807-1419	ND
2015-12-08	5810-800-1300	2.50 ppb
2015-12-08	5810-801-1024	2.40 ppb
2015-12-08	5810-802-1015	2.40 ppb
2015-12-08	5810-803-1457	1.80 ppb
2015-12-08	5810-804-0952	2.10 ppb
2015-12-08	5810-805-1536	2.00 ppb
2015-12-08	5810-806-1128	2.00 ppb
2015-12-08	5810-807-1506	ND
2016-03-08	5810-800-1300	1.50 ppb
2016-03-08	5810-801-1010	1.20 ppb
2016-03-08	5810-802-0955	1.40 ppb
2016-03-08	5810-803-1454	1.10 ppb
2016-03-08	5810-804-0932	1.10 ppb
2016-03-08	5810-805-1540	ND
2016-03-08	5810-806-1113	1.10 ppb
2016-03-08	5810-807-1507	1.30 ppb
2016-06-07	5810-800-1227	3.10 ppb
2016-06-07	5810-801-1027	3.60 ppb
2016-06-07	5810-802-1019	3.40 ppb
2016-06-07	5810-803-1433	2.20 ppb
2016-06-07	5810-804-0955	3.80 ppb
2016-06-07	5810-805-1509	3.20 ppb
2016-06-07	5810-806-1527	3.70 ppb
2016-06-07	5810-807-1441	2.80 ppb
2016-09-06	5810-800-0943	3.30 ppb
2016-09-06	5810-801-0921	3.30 ppb
2016-09-06	5810-802-0914	3.40 ppb
2016-09-06	5810-803-1045	1.90 ppb
2016-09-06	5810-804-0902	3.30 ppb
2016-09-06	5810-805-1022	3.60 ppb
2016-09-06	5810-806-1007	3.30 ppb
2016-09-06	5810-807-1101	2.70 ppb
2016-12-06	5810-800-1147	2.10 ppb
2016-12-06	5810-801-0948	2.30 ppb
2016-12-06	5810-802-0936	2.20 ppb
2016-12-06	5810-803-1439	ND
2016-12-06	5810-804-0900	2.50 ppb
2016-12-06	5810-805-1519	1.60 ppb
2016-12-06	5810-806-1056	2.30 ppb
2016-12-06	5810-807-1454	1.10 ppb
2017-03-07	5810-800-1346	4.30 ppb
2017-03-07	5810-801-1049	6.20 ppb
2017-03-07	5810-802-1025	6.40 ppb
2017-03-07	5810-803-1529	1.50 ppb
2017-03-07	5810-804-1004	7.00 ppb
2017-03-07	5810-805-1552	3.70 ppb
2017-03-07	5810-806-1147	5.90 ppb
2017-03-07	5810-807-1600	2.00 ppb
2017-06-06	5810-800-1147	3.40 ppb
2017-06-06	5810-801-1010	3.70 ppb
2017-06-06	5810-802-1000	3.90 ppb
2017-06-06	5810-803-1448	ND
2017-06-06	5810-804-0934	2.90 ppb
2017-06-06	5810-805-1515	1.90 ppb
2017-06-06	5810-806-1109	3.80 ppb
2017-06-06	5810-807-1440	ND
2017-09-05	5810-800-1258	3.30 ppb
2017-09-05	5810-801-0956	4.20 ppb
2017-09-05	5810-802-0943	2.50 ppb
2017-09-05	5810-803-1447	2.00 ppb
2017-09-05	5810-804-0914	5.70 ppb
2017-09-05	5810-805-1526	2.20 ppb
2017-09-05	5810-806-1112	3.50 ppb
2017-09-05	5810-807-1453	1.50 ppb
2017-12-06	5810-800-1020	1.20 ppb
2017-12-06	5810-801-0950	ND
2017-12-06	5810-802-0940	ND
2017-12-06	5810-803-1120	4.50 ppb
2017-12-06	5810-804-0920	1.10 ppb
2017-12-06	5810-805-1155	3.90 ppb
2017-12-06	5810-806-1005	ND
2017-12-06	5810-807-1135	9.60 ppb
2018-01-16	5810-807-1437	ND
2018-03-06	5810-800-1242	ND
2018-03-06	5810-801-1005	ND
2018-03-06	5810-802-0952	ND
2018-03-06	5810-803-1443	ND
2018-03-06	5810-804-0915	1.000 ppb
2018-03-06	5810-805-1539	ND
2018-03-06	5810-806-1103	ND
2018-03-06	5810-807-1455	ND
2018-06-05	5810-800-1325	1.70 ppb
2018-06-05	5810-801-1042	1.70 ppb
2018-06-05	5810-802-1024	1.70 ppb
2018-06-05	5810-803-1134	1.000 ppb
2018-06-05	5810-804-0943	1.60 ppb
2018-06-05	5810-805-1350	1.60 ppb
2018-06-05	5810-806-1425	1.70 ppb
2018-06-05	5810-807-1155	1.10 ppb
2018-07-27	9590-001-0935	ND
2018-09-04	5810-800-1240	1.90 ppb
2018-09-04	5810-801-0950	1.80 ppb
2018-09-04	5810-802-0941	2.10 ppb
2018-09-04	5810-803-1441	ND
2018-09-04	5810-804-0910	1.60 ppb
2018-09-04	5810-805-1522	1.80 ppb
2018-09-04	5810-806-1100	1.60 ppb
2018-09-04	5810-807-1447	2.00 ppb
2018-12-04	5810-800-1033	ND
2018-12-04	5810-801-1002	1.000 ppb
2018-12-04	5810-802-0944	ND
2018-12-04	5810-803-1412	ND
2018-12-04	5810-804-0915	ND
2018-12-04	5810-805-1500	ND
2018-12-04	5810-806-1214	1.10 ppb
2018-12-04	5810-807-1403	ND
2018-12-20	9590-005-1245	ND
2019-03-05	5810-800-0940	1.70 ppb
2019-03-05	5810-801-1019	1.70 ppb
2019-03-05	5810-802-1000	1.80 ppb
2019-03-05	5810-803-1115	1.20 ppb
2019-03-05	5810-804-1040	1.60 ppb
2019-03-05	5810-805-1218	1.40 ppb
2019-03-05	5810-806-1156	1.60 ppb
2019-03-05	5810-807-1136	1.40 ppb
2019-06-04	5810-800-1238	1.20 ppb
2019-06-04	5810-801-1002	3.00 ppb
2019-06-04	5810-802-0946	3.00 ppb
2019-06-04	5810-803-1436	1.10 ppb
2019-06-04	5810-804-0918	2.50 ppb
2019-06-04	5810-805-1529	1.20 ppb
2019-06-04	5810-806-1109	2.40 ppb
2019-06-04	5810-807-1451	1.10 ppb
2019-09-03	5810-800-1224	ND
2019-09-03	5810-801-1033	ND
2019-09-03	5810-802-1022	ND
2019-09-03	5810-803-1432	ND
2019-09-03	5810-804-0959	ND
2019-09-03	5810-805-1537	ND
2019-09-03	5810-806-1138	ND
2019-09-03	5810-807-1449	ND
2019-12-03	5810-800-1132	ND
2019-12-03	5810-801-1001	ND
2019-12-03	5810-802-0952	ND
2019-12-03	5810-803-1320	ND
2019-12-03	5810-804-0930	ND
2019-12-03	5810-805-1410	ND
2019-12-03	5810-806-1043	ND
2019-12-03	5810-807-1343	ND