Trichloroacetic acid

Sweetwater Authority

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

230

Samples

Samples exceeding legal limit (MCL)

190

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	2.70 ppb	40	38	ND - 4.50 ppb
2015	3.85 ppb	30	29	ND - 7.50 ppb
2016	1.70 ppb	40	31	ND - 4.30 ppb
2017	2.12 ppb	40	33	ND - 4.30 ppb
2018	1.44 ppb	40	31	ND - 3.40 ppb
2019	1.83 ppb	40	28	ND - 4.30 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
2014-02-10	2706-900-0940	3.40 ppb
2014-02-10	2706-901-1025	3.10 ppb
2014-02-10	2706-902-1050	4.50 ppb
2014-02-10	2706-903-1103	3.20 ppb
2014-02-10	2706-904-1110	3.20 ppb
2014-02-10	2706-905-1126	2.70 ppb
2014-02-10	2706-906-1136	3.40 ppb
2014-02-10	2706-907-1210	3.60 ppb
2014-02-10	2706-908-1305	3.90 ppb
2014-02-10	2706-909-1329	2.90 ppb
2014-05-12	2706-900-0938	2.80 ppb
2014-05-12	2706-901-1035	3.50 ppb
2014-05-12	2706-902-1055	2.80 ppb
2014-05-12	2706-903-1107	2.90 ppb
2014-05-12	2706-904-1115	2.80 ppb
2014-05-12	2706-905-1130	3.00 ppb
2014-05-12	2706-906-1140	3.30 ppb
2014-05-12	2706-907-1212	3.00 ppb
2014-05-12	2706-908-1300	2.80 ppb
2014-05-12	2706-909-1316	2.80 ppb
2014-08-11	2706-900-0957	ND
2014-08-11	2706-901-1050	2.30 ppb
2014-08-11	2706-902-1115	2.30 ppb
2014-08-11	2706-903-1128	1.60 ppb
2014-08-11	2706-904-1135	2.80 ppb
2014-08-11	2706-905-1152	2.60 ppb
2014-08-11	2706-906-1202	2.30 ppb
2014-08-11	2706-907-1245	1.70 ppb
2014-08-11	2706-908-1315	1.80 ppb
2014-08-11	2706-909-1330	2.30 ppb
2014-11-10	2706-900-0855	ND
2014-11-10	2706-901-0955	3.10 ppb
2014-11-10	2706-902-1022	3.00 ppb
2014-11-10	2706-903-1038	2.60 ppb
2014-11-10	2706-904-1044	2.60 ppb
2014-11-10	2706-905-1100	2.50 ppb
2014-11-10	2706-906-1110	2.40 ppb
2014-11-10	2706-907-1140	2.50 ppb
2014-11-10	2706-908-1230	3.60 ppb
2014-11-10	2706-909-1248	2.50 ppb
2015-02-09	2706-900-0913	ND
2015-02-09	2706-901-1010	4.90 ppb
2015-02-09	2706-902-1030	6.70 ppb
2015-02-09	2706-903-1055	7.00 ppb
2015-02-09	2706-904-1103	6.70 ppb
2015-02-09	2706-905-1130	7.40 ppb
2015-02-09	2706-906-1140	7.50 ppb
2015-02-09	2706-907-1205	6.30 ppb
2015-02-09	2706-908-1306	7.20 ppb
2015-02-09	2706-909-1320	6.40 ppb
2015-05-11	2706-900-0912	1.70 ppb
2015-05-11	2706-901-1018	2.00 ppb
2015-05-11	2706-902-1036	3.00 ppb
2015-05-11	2706-903-1050	3.00 ppb
2015-05-11	2706-904-1055	3.00 ppb
2015-05-11	2706-905-1108	2.90 ppb
2015-05-11	2706-906-1122	3.00 ppb
2015-05-11	2706-907-1200	3.10 ppb
2015-05-11	2706-908-1248	2.90 ppb
2015-05-11	2706-909-1305	2.90 ppb
2015-08-10	2706-900-1000	2.50 ppb
2015-08-10	2706-901-1111	2.60 ppb
2015-08-10	2706-902-1136	2.40 ppb
2015-08-10	2706-903-1140	2.90 ppb
2015-08-10	2706-904-1213	3.10 ppb
2015-08-10	2706-905-1223	3.20 ppb
2015-08-10	2706-906-1235	3.20 ppb
2015-08-10	2706-907-1312	2.70 ppb
2015-08-10	2706-908-1424	2.90 ppb
2015-08-10	2706-909-1443	2.50 ppb
2016-02-08	2706-900-1000	2.30 ppb
2016-02-08	2706-901-1106	1.60 ppb
2016-02-08	2706-902-1136	2.80 ppb
2016-02-08	2706-903-1215	2.60 ppb
2016-02-08	2706-904-1228	3.80 ppb
2016-02-08	2706-905-1315	1.10 ppb
2016-02-08	2706-906-1300	2.80 ppb
2016-02-08	2706-907-1405	4.30 ppb
2016-02-08	2706-908-1450	1.20 ppb
2016-02-08	2706-909-1520	2.10 ppb
2016-05-09	2706-900-0950	ND
2016-05-09	2706-901-1036	ND
2016-05-09	2706-902-1057	ND
2016-05-09	2706-903-1113	2.00 ppb
2016-05-09	2706-904-1120	ND
2016-05-09	2706-905-1136	ND
2016-05-09	2706-906-1145	ND
2016-05-09	2706-907-1219	ND
2016-05-09	2706-908-1249	ND
2016-05-09	2706-909-1305	ND
2016-08-08	0007-900-0954	2.80 ppb
2016-08-08	0007-901-1109	1.20 ppb
2016-08-08	0007-902-1130	2.40 ppb
2016-08-08	0007-903-1137	2.20 ppb
2016-08-08	0007-904-1208	3.60 ppb
2016-08-08	0007-905-1219	2.20 ppb
2016-08-08	0007-906-1232	3.00 ppb
2016-08-08	0007-907-1309	2.40 ppb
2016-08-08	0007-908-1357	2.20 ppb
2016-08-08	0007-909-1415	2.10 ppb
2016-11-14	9590-900-0930	1.40 ppb
2016-11-14	9590-901-1008	1.50 ppb
2016-11-14	9590-902-1040	1.80 ppb
2016-11-14	9590-903-1053	2.00 ppb
2016-11-14	9590-904-1105	1.70 ppb
2016-11-14	9590-905-1140	1.80 ppb
2016-11-14	9590-906-1145	1.80 ppb
2016-11-14	9590-907-1240	1.80 ppb
2016-11-14	9590-908-1315	1.80 ppb
2016-11-14	9590-909-1330	1.50 ppb
2017-02-13	9590-900-0950	ND
2017-02-13	9590-901-1025	2.00 ppb
2017-02-13	9590-902-1042	2.10 ppb
2017-02-13	9590-903-1320	2.10 ppb
2017-02-13	9590-904-1335	2.00 ppb
2017-02-13	9590-905-1108	1.90 ppb
2017-02-13	9590-906-1350	1.90 ppb
2017-02-13	9590-907-1155	1.90 ppb
2017-02-13	9590-908-1225	2.00 ppb
2017-02-13	9590-909-1415	2.00 ppb
2017-05-08	9590-900-1005	2.70 ppb
2017-05-08	9590-901-1055	4.10 ppb
2017-05-08	9590-902-1115	4.20 ppb
2017-05-08	9590-903-1128	3.40 ppb
2017-05-08	9590-904-1153	3.80 ppb
2017-05-08	9590-905-1204	4.00 ppb
2017-05-08	9590-906-1217	4.10 ppb
2017-05-08	9590-907-1253	3.60 ppb
2017-05-08	9590-908-1336	3.80 ppb
2017-05-08	9590-909-1355	4.30 ppb
2017-08-14	9590-900-0947	ND
2017-08-14	9590-901-1030	ND
2017-08-14	9590-902-1116	ND
2017-08-14	9590-903-1139	ND
2017-08-14	9590-904-1209	1.30 ppb
2017-08-14	9590-905-1225	1.50 ppb
2017-08-14	9590-906-1240	1.60 ppb
2017-08-14	9590-907-1342	1.60 ppb
2017-08-14	9590-908-1415	1.60 ppb
2017-08-14	9590-909-1505	1.20 ppb
2017-11-13	9590-900-0958	ND
2017-11-13	9590-901-1045	ND
2017-11-13	9590-902-1110	1.10 ppb
2017-11-13	9590-903-1122	2.10 ppb
2017-11-13	9590-904-1157	2.50 ppb
2017-11-13	9590-905-1230	2.80 ppb
2017-11-13	9590-906-1243	2.80 ppb
2017-11-13	9590-907-1335	2.80 ppb
2017-11-13	9590-908-1411	3.20 ppb
2017-11-13	9590-909-1457	2.80 ppb
2018-02-12	9590-900-1012	ND
2018-02-12	9590-901-1112	1.20 ppb
2018-02-12	9590-902-1122	1.60 ppb
2018-02-12	9590-903-1146	1.50 ppb
2018-02-12	9590-904-1151	1.30 ppb
2018-02-12	9590-905-1210	1.50 ppb
2018-02-12	9590-906-1220	1.30 ppb
2018-02-12	9590-907-1300	1.70 ppb
2018-02-12	9590-908-1336	1.70 ppb
2018-02-12	9590-909-1355	1.60 ppb
2018-05-14	9590-900-1031	ND
2018-05-14	9590-901-1141	ND
2018-05-14	9590-902-1220	1.000 ppb
2018-05-14	9590-903-1242	ND
2018-05-14	9590-904-1326	2.60 ppb
2018-05-14	9590-905-1339	2.10 ppb
2018-05-14	9590-906-1359	2.60 ppb
2018-05-14	9590-907-1454	2.40 ppb
2018-05-14	9590-908-1537	2.80 ppb
2018-05-14	9590-909-1622	2.30 ppb
2018-08-13	9590-900-0948	ND
2018-08-13	9590-901-1041	1.000 ppb
2018-08-13	9590-902-1121	2.20 ppb
2018-08-13	9590-903-1154	1.40 ppb
2018-08-13	9590-904-1208	2.20 ppb
2018-08-13	9590-905-1234	2.10 ppb
2018-08-13	9590-906-1257	2.60 ppb
2018-08-13	9590-907-1358	2.30 ppb
2018-08-13	9590-908-1454	3.00 ppb
2018-08-13	9590-909-1518	3.40 ppb
2018-11-14	9590-900-0817	ND
2018-11-14	9590-901-0840	ND
2018-11-14	9590-902-0900	ND
2018-11-14	9590-903-0915	ND
2018-11-14	9590-904-0930	1.40 ppb
2018-11-14	9590-905-1005	1.10 ppb
2018-11-14	9590-906-0950	1.40 ppb
2018-11-14	9590-907-1035	1.40 ppb
2018-11-14	9590-908-1100	1.50 ppb
2018-11-14	9590-909-1125	1.40 ppb
2019-02-13	9590-900-0813	ND
2019-02-13	9590-901-0844	ND
2019-02-13	9590-902-0902	ND
2019-02-13	9590-903-0917	ND
2019-02-13	9590-904-0930	ND
2019-02-13	9590-905-0958	ND
2019-02-13	9590-906-0946	ND
2019-02-13	9590-907-1027	ND
2019-02-13	9590-908-1050	ND
2019-02-13	9590-909-1114	1.000 ppb
2019-05-15	9590-900-0820	ND
2019-05-15	9590-901-0855	2.60 ppb
2019-05-15	9590-902-1015	3.30 ppb
2019-05-15	9590-903-0920	3.10 ppb
2019-05-15	9590-904-0935	3.80 ppb
2019-05-15	9590-905-1000	3.90 ppb
2019-05-15	9590-906-0950	3.80 ppb
2019-05-15	9590-907-1050	3.90 ppb
2019-05-15	9590-908-1110	4.00 ppb
2019-05-15	9590-909-1125	4.30 ppb
2019-08-14	9590-900-0815	ND
2019-08-14	9590-901-0840	1.70 ppb
2019-08-14	9590-902-0900	2.00 ppb
2019-08-14	9590-903-0915	1.80 ppb
2019-08-14	9590-904-0930	2.40 ppb
2019-08-14	9590-905-0955	2.50 ppb
2019-08-14	9590-906-0945	2.50 ppb
2019-08-14	9590-907-1035	2.80 ppb
2019-08-14	9590-908-1055	2.50 ppb
2019-08-14	9590-909-1110	2.60 ppb
2019-11-13	9590-900-0813	ND
2019-11-13	9590-901-0840	1.90 ppb
2019-11-13	9590-902-0905	2.20 ppb
2019-11-13	9590-903-0925	1.60 ppb
2019-11-13	9590-904-0945	2.10 ppb
2019-11-13	9590-905-1025	2.20 ppb
2019-11-13	9590-906-1005	2.10 ppb
2019-11-13	9590-907-1050	2.00 ppb
2019-11-13	9590-908-1120	2.30 ppb
2019-11-13	9590-909-1150	2.20 ppb