Trichloroacetic acid

Vallecitos 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

184

Samples

Samples exceeding legal limit (MCL)

131

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	3.10 ppb	32	31	ND - 5.80 ppb
2015	3.24 ppb	32	32	1.10 ppb - 5.20 ppb
2016	1.61 ppb	32	16	ND - 5.20 ppb
2017	1.76 ppb	32	23	ND - 16.0 ppb
2018	0.588 ppb	32	9	ND - 5.70 ppb
2019	1.59 ppb	24	20	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
2014-01-15	2706-900-0915	3.60 ppb
2014-01-15	2706-901-1100	3.70 ppb
2014-01-15	2706-902-0940	4.60 ppb
2014-01-15	2706-903-1025	5.80 ppb
2014-01-15	2706-904-1015	3.50 ppb
2014-01-15	2706-905-0845	3.40 ppb
2014-01-15	2706-906-0905	1.80 ppb
2014-01-15	2706-907-0810	3.50 ppb
2014-04-16	2706-900-0910	4.00 ppb
2014-04-16	2706-901-0730	3.40 ppb
2014-04-16	2706-902-1110	3.40 ppb
2014-04-16	2706-903-1040	3.20 ppb
2014-04-16	2706-904-0950	2.90 ppb
2014-04-16	2706-905-0840	3.90 ppb
2014-04-16	2706-906-1140	1.90 ppb
2014-04-16	2706-907-1200	3.40 ppb
2014-07-16	2706-900-1035	1.70 ppb
2014-07-16	2706-901-1125	1.60 ppb
2014-07-16	2706-902-0825	1.70 ppb
2014-07-16	2706-903-0750	2.00 ppb
2014-07-16	2706-904-1000	1.40 ppb
2014-07-16	2706-905-1055	2.00 ppb
2014-07-16	2706-906-0855	ND
2014-07-16	2706-907-0930	1.20 ppb
2014-10-15	2706-900-1145	4.30 ppb
2014-10-15	2706-901-1010	4.80 ppb
2014-10-15	2706-902-1215	3.30 ppb
2014-10-15	2706-903-1145	4.10 ppb
2014-10-15	2706-904-1100	4.30 ppb
2014-10-15	2706-905-1115	4.30 ppb
2014-10-15	2706-906-1015	2.30 ppb
2014-10-15	2706-907-1050	4.30 ppb
2015-01-21	2706-900-1050	4.60 ppb
2015-01-21	2706-901-0900	5.20 ppb
2015-01-21	2706-902-1100	3.80 ppb
2015-01-21	2706-903-1130	3.70 ppb
2015-01-21	2706-904-1115	3.60 ppb
2015-01-21	2706-905-0955	4.20 ppb
2015-01-21	2706-906-1030	1.40 ppb
2015-01-21	2706-907-1000	3.80 ppb
2015-04-15	2706-900-0910	3.70 ppb
2015-04-15	2706-901-0830	3.60 ppb
2015-04-15	2706-902-0850	3.70 ppb
2015-04-15	2706-903-0805	3.30 ppb
2015-04-15	2706-904-1000	3.60 ppb
2015-04-15	2706-905-0930	3.90 ppb
2015-04-15	2706-906-0940	1.60 ppb
2015-04-15	2706-907-1015	3.00 ppb
2015-07-15	0007-900-1015	2.60 ppb
2015-07-15	0007-901-0920	2.40 ppb
2015-07-15	0007-902-0910	2.80 ppb
2015-07-15	0007-903-0840	2.70 ppb
2015-07-15	0007-904-1125	2.60 ppb
2015-07-15	0007-905-1045	2.80 ppb
2015-07-15	0007-906-0940	1.10 ppb
2015-07-15	0007-907-1245	3.50 ppb
2015-10-21	2706-900-0835	2.90 ppb
2015-10-21	2706-901-0940	4.10 ppb
2015-10-21	2706-902-0900	2.90 ppb
2015-10-21	2706-903-0930	3.00 ppb
2015-10-21	2706-904-0755	2.70 ppb
2015-10-21	2706-905-0915	3.30 ppb
2015-10-21	2706-906-1005	3.40 ppb
2015-10-21	2706-907-1040	4.30 ppb
2016-01-20	2706-900-1015	4.60 ppb
2016-01-20	2706-901-0910	4.40 ppb
2016-01-20	2706-902-1015	1.20 ppb
2016-01-20	2706-903-1105	ND
2016-01-20	2706-904-1120	5.00 ppb
2016-01-20	2706-905-0940	5.20 ppb
2016-01-20	2706-906-0940	5.00 ppb
2016-01-20	2706-907-0910	2.40 ppb
2016-04-20	2706-900-0950	2.70 ppb
2016-04-20	2706-901-0905	2.90 ppb
2016-04-20	2706-902-1000	ND
2016-04-20	2706-903-0850	ND
2016-04-20	2706-904-1100	1.90 ppb
2016-04-20	2706-905-1035	2.20 ppb
2016-04-20	2706-906-0925	1.80 ppb
2016-04-20	2706-907-0950	ND
2016-07-20	2706-900-0925	ND
2016-07-20	2706-901-1025	ND
2016-07-20	2706-902-1000	ND
2016-07-20	2706-903-0940	ND
2016-07-20	2706-904-0845	ND
2016-07-20	2706-905-0945	ND
2016-07-20	2706-906-1040	5.10 ppb
2016-07-20	2706-907-1115	ND
2016-10-19	2706-900-0950	ND
2016-10-19	2706-901-0900	ND
2016-10-19	2706-902-1000	ND
2016-10-19	2706-903-1030	ND
2016-10-19	2706-904-1100	ND
2016-10-19	2706-905-1025	2.40 ppb
2016-10-19	2706-906-0930	3.50 ppb
2016-10-19	2706-907-0900	1.30 ppb
2017-01-18	0007-900-1000	2.00 ppb
2017-01-18	0007-901-1030	1.90 ppb
2017-01-18	0007-902-0950	ND
2017-01-18	0007-903-0925	ND
2017-01-18	0007-904-1240	2.00 ppb
2017-01-18	0007-905-0930	2.40 ppb
2017-01-18	0007-906-1050	ND
2017-01-18	0007-907-1120	ND
2017-04-19	0007-900-1000	2.30 ppb
2017-04-19	0007-901-0830	2.40 ppb
2017-04-19	0007-902-0840	2.00 ppb
2017-04-19	0007-903-0800	2.00 ppb
2017-04-19	0007-904-1045	2.30 ppb
2017-04-19	0007-905-0920	2.30 ppb
2017-04-19	0007-906-0920	16.0 ppb
2017-04-19	0007-907-0940	1.60 ppb
2017-07-19	0007-900-0920	1.60 ppb
2017-07-19	0007-901-0745	2.10 ppb
2017-07-19	0007-902-0745	1.40 ppb
2017-07-19	0007-903-0930	ND
2017-07-19	0007-904-0945	1.80 ppb
2017-07-19	0007-905-0900	1.30 ppb
2017-07-19	0007-906-0815	1.80 ppb
2017-07-19	0007-907-0845	ND
2017-10-18	0007-900-1000	ND
2017-10-18	0007-901-0920	1.40 ppb
2017-10-18	0007-902-0900	1.10 ppb
2017-10-18	0007-903-0820	ND
2017-10-18	0007-904-1100	ND
2017-10-18	0007-905-0840	1.000 ppb
2017-10-18	0007-906-0925	2.40 ppb
2017-10-18	0007-907-0750	1.30 ppb
2018-01-17	0007-900-1050	ND
2018-01-17	0007-901-0910	ND
2018-01-17	0007-902-0855	1.10 ppb
2018-01-17	0007-903-0830	ND
2018-01-17	0007-904-1125	ND
2018-01-17	0007-905-0945	ND
2018-01-17	0007-906-0930	5.70 ppb
2018-01-17	0007-907-1000	1.50 ppb
2018-04-18	0007-900-0945	ND
2018-04-18	0007-901-0830	1.000 ppb
2018-04-18	0007-902-1015	ND
2018-04-18	0007-903-0945	ND
2018-04-18	0007-904-1030	ND
2018-04-18	0007-905-0930	ND
2018-04-18	0007-906-1055	2.30 ppb
2018-04-18	0007-907-1125	ND
2018-07-18	0007-900-0850	ND
2018-07-18	0007-901-0850	ND
2018-07-18	0007-902-0855	ND
2018-07-18	0007-903-0830	ND
2018-07-18	0007-904-0755	ND
2018-07-18	0007-905-0830	ND
2018-07-18	0007-906-0940	1.80 ppb
2018-07-18	0007-907-0730	1.50 ppb
2018-10-17	0007-900-1010	ND
2018-10-17	0007-901-0840	1.30 ppb
2018-10-17	0007-902-0830	ND
2018-10-17	0007-903-0800	ND
2018-10-17	0007-904-1040	ND
2018-10-17	0007-905-0930	ND
2018-10-17	0007-906-0900	2.60 ppb
2018-10-17	0007-907-0935	ND
2019-01-16	0007-900-1105	2.80 ppb
2019-01-16	0007-901-0940	2.80 ppb
2019-01-16	0007-902-0950	1.90 ppb
2019-01-16	0007-903-0900	2.20 ppb
2019-01-16	0007-904-1150	2.10 ppb
2019-01-16	0007-905-1035	2.00 ppb
2019-01-16	0007-906-1040	2.50 ppb
2019-01-16	0007-907-1105	2.40 ppb
2019-04-17	0007-900-1050	1.40 ppb
2019-04-17	0007-901-0840	2.10 ppb
2019-04-17	0007-902-0915	1.10 ppb
2019-04-17	0007-903-0925	1.40 ppb
2019-04-17	0007-904-0845	1.20 ppb
2019-04-17	0007-905-1030	1.60 ppb
2019-04-17	0007-906-0830	4.50 ppb
2019-04-17	0007-907-1310	1.20 ppb
2019-07-17	0007-900-1010	1.20 ppb
2019-07-17	0007-901-0930	1.50 ppb
2019-07-17	0007-902-1005	ND
2019-07-17	0007-903-1055	1.10 ppb
2019-07-17	0007-904-1110	ND
2019-07-17	0007-905-0815	1.10 ppb
2019-07-17	0007-906-0925	ND
2019-07-17	0007-907-0830	ND