Trichloroacetic acid

California Water Service (CWS) - Visalia

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

144

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	24	ND
2015	ND	24	ND
2016	ND	24	ND
2017	ND	24	ND
2018	ND	24	ND
2019	ND	24	ND

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
2014-01-08	5810-900-0900	ND
2014-01-08	5810-901-0920	ND
2014-01-08	5810-902-1031	ND
2014-01-08	5810-903-1242	ND
2014-01-08	5810-904-1313	ND
2014-01-08	5810-905-1053	ND
2014-04-09	5810-900-1108	ND
2014-04-09	5810-901-1055	ND
2014-04-09	5810-902-1510	ND
2014-04-09	5810-903-1350	ND
2014-04-09	5810-904-1319	ND
2014-04-09	5810-905-1445	ND
2014-07-09	5810-900-1036	ND
2014-07-09	5810-901-1016	ND
2014-07-09	5810-902-1334	ND
2014-07-09	5810-903-1450	ND
2014-07-09	5810-904-1421	ND
2014-07-09	5810-905-1404	ND
2014-10-07	5810-900-0905	ND
2014-10-07	5810-901-0947	ND
2014-10-07	5810-902-1037	ND
2014-10-07	5810-903-1100	ND
2014-10-07	5810-904-1115	ND
2014-10-07	5810-905-1318	ND
2015-01-06	5810-900-0902	ND
2015-01-06	5810-901-0844	ND
2015-01-06	5810-902-1053	ND
2015-01-06	5810-903-1144	ND
2015-01-06	5810-904-1302	ND
2015-01-06	5810-905-1012	ND
2015-04-07	5810-900-0854	ND
2015-04-07	5810-901-0927	ND
2015-04-07	5810-902-1230	ND
2015-04-07	5810-903-1312	ND
2015-04-07	5810-904-1330	ND
2015-04-07	5810-905-1211	ND
2015-07-08	5810-900-1155	ND
2015-07-08	5810-901-1139	ND
2015-07-08	5810-902-1314	ND
2015-07-08	5810-903-1441	ND
2015-07-08	5810-904-1507	ND
2015-07-08	5810-905-1350	ND
2015-10-07	5810-900-1550	ND
2015-10-07	5810-901-1022	ND
2015-10-07	5810-902-1219	ND
2015-10-07	5810-903-1306	ND
2015-10-07	5810-904-1354	ND
2015-10-07	5810-905-1458	ND
2016-01-05	5810-900-0926	ND
2016-01-05	5810-901-0905	ND
2016-01-05	5810-902-1159	ND
2016-01-05	5810-903-1240	ND
2016-01-05	5810-904-1340	ND
2016-01-05	5810-905-1136	ND
2016-04-06	5810-900-1547	ND
2016-04-06	5810-901-1527	ND
2016-04-06	5810-902-1257	ND
2016-04-06	5810-903-1205	ND
2016-04-06	5810-904-1135	ND
2016-04-06	5810-905-1505	ND
2016-07-05	5810-900-1633	ND
2016-07-05	5810-901-1613	ND
2016-07-05	5810-902-1457	ND
2016-07-05	5810-903-1222	ND
2016-07-05	5810-904-1203	ND
2016-07-05	5810-905-1226	ND
2016-10-04	5810-900-1300	ND
2016-10-04	5810-901-1240	ND
2016-10-04	5810-902-1405	ND
2016-10-04	5810-903-1135	ND
2016-10-04	5810-904-1200	ND
2016-10-04	5810-905-1457	ND
2017-01-03	5810-900-1209	ND
2017-01-03	5810-901-1140	ND
2017-01-03	5810-902-1313	ND
2017-01-03	5810-903-1610	ND
2017-01-03	5810-904-1634	ND
2017-01-03	5810-905-1426	ND
2017-04-04	5810-900-0832	ND
2017-04-04	5810-901-0914	ND
2017-04-04	5810-902-1041	ND
2017-04-04	5810-903-1307	ND
2017-04-04	5810-904-1248	ND
2017-04-04	5810-905-1110	ND
2017-07-05	5810-900-0853	ND
2017-07-05	5810-901-0911	ND
2017-07-05	5810-902-1143	ND
2017-07-05	5810-903-1014	ND
2017-07-05	5810-904-0936	ND
2017-07-05	5810-905-1111	ND
2017-10-04	5810-900-0902	ND
2017-10-04	5810-901-1613	ND
2017-10-04	5810-902-1028	ND
2017-10-04	5810-903-0156	ND
2017-10-04	5810-904-1234	ND
2017-10-04	5810-905-1349	ND
2018-01-03	5810-900-1322	ND
2018-01-03	5810-901-1340	ND
2018-01-03	5810-902-1136	ND
2018-01-03	5810-903-1014	ND
2018-01-03	5810-904-0915	ND
2018-01-03	5810-905-1115	ND
2018-04-04	5810-900-0931	ND
2018-04-04	5810-901-0947	ND
2018-04-04	5810-902-1354	ND
2018-04-04	5810-903-1200	ND
2018-04-04	5810-904-1055	ND
2018-04-04	5810-905-1313	ND
2018-07-05	5810-900-0957	ND
2018-07-05	5810-901-0940	ND
2018-07-05	5810-902-1056	ND
2018-07-05	5810-903-1342	ND
2018-07-05	5810-904-1259	ND
2018-07-05	5810-905-1433	ND
2018-10-02	5810-900-1144	ND
2018-10-02	5810-901-0836	ND
2018-10-02	5810-902-1124	ND
2018-10-02	5810-903-1022	ND
2018-10-02	5810-904-0922	ND
2018-10-02	5810-905-1110	ND
2019-01-02	5810-900-1304	ND
2019-01-02	5810-901-1134	ND
2019-01-02	5810-902-1434	ND
2019-01-02	5810-903-1209	ND
2019-01-02	5810-904-1102	ND
2019-01-02	5810-905-1357	ND
2019-04-05	5810-900-1503	ND
2019-04-05	5810-901-1525	ND
2019-04-05	5810-902-1432	ND
2019-04-05	5810-903-1315	ND
2019-04-05	5810-904-1208	ND
2019-04-05	5810-905-1414	ND
2019-07-07	5810-900-0900	ND
2019-07-07	5810-901-1146	ND
2019-07-07	5810-902-0923	ND
2019-07-07	5810-903-1004	ND
2019-07-07	5810-904-1024	ND
2019-07-07	5810-905-0943	ND
2019-10-08	5810-900-1225	ND
2019-10-08	5810-901-1333	ND
2019-10-08	5810-902-1443	ND
2019-10-08	5810-903-1256	ND
2019-10-08	5810-905-1504	ND
2019-10-13	5810-904-1008	ND