Trichloroacetic acid

Otay Water District

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

196

Samples

Samples exceeding legal limit (MCL)

116

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	1.57 ppb	32	27	ND - 4.30 ppb
2015	1.50 ppb	32	21	ND - 4.30 ppb
2016	1.17 ppb	32	17	ND - 4.40 ppb
2017	1.67 ppb	32	20	ND - 7.70 ppb
2018	1.18 ppb	32	16	ND - 4.60 ppb
2019	0.914 ppb	36	15	ND - 4.50 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	9590-900-0700	4.30 ppb
2014-02-10	9590-901-0940	3.40 ppb
2014-02-10	9590-902-0740	3.70 ppb
2014-02-10	9590-903-1400	1.90 ppb
2014-02-10	9590-904-1240	1.90 ppb
2014-02-10	9590-905-1505	1.70 ppb
2014-02-10	9590-906-1435	2.00 ppb
2014-02-10	9590-907-1215	1.80 ppb
2014-05-13	9590-900-0640	3.50 ppb
2014-05-13	9590-901-0745	2.40 ppb
2014-05-13	9590-902-0710	2.60 ppb
2014-05-13	9590-903-1145	1.60 ppb
2014-05-13	9590-904-1030	1.40 ppb
2014-05-13	9590-905-1315	1.30 ppb
2014-05-13	9590-906-1230	1.40 ppb
2014-05-13	9590-907-0900	1.40 ppb
2014-08-12	9590-900-0710	ND
2014-08-12	9590-901-0630	ND
2014-08-12	9590-902-0740	ND
2014-08-12	9590-903-1120	1.20 ppb
2014-08-12	9590-904-1030	1.20 ppb
2014-08-12	9590-905-1315	1.20 ppb
2014-08-12	9590-906-1220	1.20 ppb
2014-08-12	9590-907-0910	1.10 ppb
2014-11-12	9590-900-0930	1.50 ppb
2014-11-12	9590-901-0700	1.20 ppb
2014-11-12	9590-902-0830	2.00 ppb
2014-11-12	9590-903-1200	ND
2014-11-12	9590-904-1400	1.10 ppb
2014-11-12	9590-905-1310	1.20 ppb
2014-11-12	9590-906-1240	ND
2014-11-12	9590-907-1430	1.10 ppb
2015-02-09	9590-900-0830	4.20 ppb
2015-02-09	9590-901-0950	4.30 ppb
2015-02-09	9590-902-0910	4.20 ppb
2015-02-09	9590-903-1315	1.80 ppb
2015-02-09	9590-904-1145	2.40 ppb
2015-02-09	9590-905-1450	3.00 ppb
2015-02-09	9590-906-1400	2.10 ppb
2015-02-09	9590-907-1115	2.50 ppb
2015-05-13	9590-900-0700	2.20 ppb
2015-05-13	9590-901-0830	2.10 ppb
2015-05-13	9590-902-0745	2.90 ppb
2015-05-13	9590-903-1100	ND
2015-05-13	9590-904-1310	ND
2015-05-13	9590-905-1200	ND
2015-05-13	9590-906-1130	ND
2015-05-13	9590-907-1340	ND
2015-08-11	9590-900-0700	ND
2015-08-11	9590-901-0800	ND
2015-08-11	9590-902-0730	1.30 ppb
2015-08-11	9590-903-1140	1.30 ppb
2015-08-11	9590-904-1050	ND
2015-08-11	9590-905-1350	ND
2015-08-11	9590-906-1235	ND
2015-08-11	9590-907-0930	ND
2015-11-09	9590-900-1410	1.80 ppb
2015-11-09	9590-901-1500	1.80 ppb
2015-11-09	9590-902-1440	2.80 ppb
2015-11-09	9590-903-1120	1.30 ppb
2015-11-09	9590-904-1025	1.40 ppb
2015-11-09	9590-905-1250	1.50 ppb
2015-11-09	9590-906-1210	1.40 ppb
2015-11-09	9590-907-0845	1.60 ppb
2016-02-09	9590-900-1350	1.70 ppb
2016-02-09	9590-901-1530	3.00 ppb
2016-02-09	9590-902-1430	4.40 ppb
2016-02-09	9590-903-1050	1.30 ppb
2016-02-09	9590-904-0940	1.10 ppb
2016-02-09	9590-905-1200	1.000 ppb
2016-02-09	9590-906-1130	1.000 ppb
2016-02-09	9590-907-1300	1.10 ppb
2016-05-10	9590-900-1200	2.50 ppb
2016-05-10	9590-901-1310	2.40 ppb
2016-05-10	9590-902-1235	4.20 ppb
2016-05-10	9590-903-0900	ND
2016-05-10	9590-904-0930	ND
2016-05-10	9590-905-1000	ND
2016-05-10	9590-906-1030	ND
2016-05-10	9590-907-1100	ND
2016-08-09	9590-900-0825	2.30 ppb
2016-08-09	9590-901-0900	2.20 ppb
2016-08-09	9590-902-0630	2.10 ppb
2016-08-09	9590-903-1145	ND
2016-08-09	9590-904-1040	ND
2016-08-09	9590-905-1320	ND
2016-08-09	9590-906-1220	ND
2016-08-09	9590-907-1010	ND
2016-11-14	9590-900-1000	2.10 ppb
2016-11-14	9590-901-0925	2.30 ppb
2016-11-14	9590-902-0750	2.60 ppb
2016-11-14	9590-903-1150	ND
2016-11-14	9590-904-1125	ND
2016-11-14	9590-905-1245	ND
2016-11-14	9590-906-1220	ND
2016-11-14	9590-907-1100	ND
2017-02-14	9590-900-1210	2.40 ppb
2017-02-14	9590-901-1330	2.80 ppb
2017-02-14	9590-902-1300	3.60 ppb
2017-02-14	9590-903-1010	ND
2017-02-14	9590-904-0855	ND
2017-02-14	9590-905-1120	ND
2017-02-14	9590-906-1045	ND
2017-02-14	9590-907-0830	ND
2017-05-31	9590-900-0900	3.60 ppb
2017-05-31	9590-901-1000	6.10 ppb
2017-05-31	9590-902-0930	7.70 ppb
2017-05-31	9590-903-1310	1.60 ppb
2017-05-31	9590-904-1130	ND
2017-05-31	9590-905-1400	1.10 ppb
2017-05-31	9590-906-1340	1.10 ppb
2017-05-31	9590-907-1420	ND
2017-08-14	9590-900-1330	1.90 ppb
2017-08-14	9590-901-1400	1.90 ppb
2017-08-14	9590-902-0900	1.60 ppb
2017-08-14	9590-903-1130	ND
2017-08-14	9590-904-1030	ND
2017-08-14	9590-905-1230	ND
2017-08-14	9590-906-1200	ND
2017-08-14	9590-907-1000	ND
2017-11-13	9590-900-1300	2.10 ppb
2017-11-13	9590-901-1400	2.30 ppb
2017-11-13	9590-902-1330	5.80 ppb
2017-11-13	9590-903-1110	1.000 ppb
2017-11-13	9590-904-1015	1.70 ppb
2017-11-13	9590-905-1215	1.80 ppb
2017-11-13	9590-906-1130	1.50 ppb
2017-11-13	9590-907-0950	1.80 ppb
2018-02-12	9590-900-1230	4.30 ppb
2018-02-12	9590-901-1350	4.00 ppb
2018-02-12	9590-902-1320	2.90 ppb
2018-02-12	9590-903-1030	ND
2018-02-12	9590-904-0925	ND
2018-02-12	9590-905-1120	ND
2018-02-12	9590-906-1100	ND
2018-02-12	9590-907-0900	ND
2018-05-14	9590-900-1330	3.40 ppb
2018-05-14	9590-901-0900	4.00 ppb
2018-05-14	9590-902-0820	4.60 ppb
2018-05-14	9590-903-1125	ND
2018-05-14	9590-904-1030	ND
2018-05-14	9590-905-1230	ND
2018-05-14	9590-906-1200	ND
2018-05-14	9590-907-1000	ND
2018-08-13	9590-900-1230	1.30 ppb
2018-08-13	9590-901-1330	1.30 ppb
2018-08-13	9590-902-1300	2.10 ppb
2018-08-13	9590-903-1000	ND
2018-08-13	9590-904-0900	ND
2018-08-13	9590-905-1100	ND
2018-08-13	9590-906-1030	ND
2018-08-13	9590-907-0830	ND
2018-11-13	9590-900-1340	2.00 ppb
2018-11-13	9590-901-1435	1.90 ppb
2018-11-13	9590-902-1410	1.60 ppb
2018-11-13	9590-903-1100	ND
2018-11-13	9590-904-0900	1.10 ppb
2018-11-13	9590-905-1215	1.000 ppb
2018-11-13	9590-906-1130	1.10 ppb
2018-11-13	9590-907-0830	1.10 ppb
2019-02-12	9590-900-0815	1.60 ppb
2019-02-12	9590-901-0940	1.80 ppb
2019-02-12	9590-902-0845	1.50 ppb
2019-02-12	9590-903-1120	ND
2019-02-12	9590-904-1320	ND
2019-02-12	9590-905-1220	ND
2019-02-12	9590-906-1155	ND
2019-02-12	9590-907-1345	ND
2019-05-15	9590-003-1010	ND
2019-05-15	9590-005-1300	2.90 ppb
2019-05-15	9590-900-1240	4.50 ppb
2019-05-15	9590-901-1140	3.80 ppb
2019-05-15	9590-902-1210	2.70 ppb
2019-05-15	9590-903-0840	2.20 ppb
2019-05-15	9590-904-1040	ND
2019-05-15	9590-905-0940	ND
2019-05-15	9590-906-0910	ND
2019-05-15	9590-907-1100	ND
2019-08-12	4790-900-0805	2.20 ppb
2019-08-12	4790-901-0905	1.30 ppb
2019-08-12	4790-902-0835	1.80 ppb
2019-08-12	4790-903-1050	ND
2019-08-12	4790-904-1330	ND
2019-08-12	4790-905-1215	ND
2019-08-12	4790-906-1145	ND
2019-08-12	4790-907-1015	ND
2019-11-12	4790-003-1245	ND
2019-11-12	4790-005-0945	1.20 ppb
2019-11-12	4790-900-0810	1.80 ppb
2019-11-12	4790-901-0915	1.90 ppb
2019-11-12	4790-902-0840	1.70 ppb
2019-11-12	4790-903-1100	ND
2019-11-12	4790-904-1315	ND
2019-11-12	4790-905-1215	ND
2019-11-12	4790-906-1145	ND
2019-11-12	4790-907-1030	ND