Trichloroacetic acid

Rowland 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)

122

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	2.77 ppb	32	26	ND - 5.70 ppb
2015	2.13 ppb	32	21	ND - 4.70 ppb
2016	2.75 ppb	32	27	ND - 5.10 ppb
2017	5.94 ppb	24	17	ND - 12.5 ppb
2018	0.894 ppb	32	17	ND - 2.70 ppb
2019	0.681 ppb	32	14	ND - 3.50 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
2014-03-10	3761-800-0825	1.40 ppb
2014-03-10	3761-801-0840	1.30 ppb
2014-03-10	3761-802-0925	ND
2014-03-10	3761-803-0940	ND
2014-03-10	3761-804-1000	2.80 ppb
2014-03-10	3761-805-0820	ND
2014-03-10	3761-806-1110	2.60 ppb
2014-03-10	3761-807-1110	ND
2014-06-09	3761-800-0800	4.70 ppb
2014-06-09	3761-801-1100	4.70 ppb
2014-06-09	3761-802-0850	5.70 ppb
2014-06-09	3761-803-0910	4.80 ppb
2014-06-09	3761-804-0930	4.70 ppb
2014-06-09	3761-805-0800	5.70 ppb
2014-06-09	3761-806-1100	4.30 ppb
2014-06-09	3761-807-1040	4.60 ppb
2014-09-08	3761-800-1050	4.10 ppb
2014-09-08	3761-801-1030	3.80 ppb
2014-09-08	3761-802-0750	4.30 ppb
2014-09-08	3761-803-0810	3.90 ppb
2014-09-08	3761-804-0830	3.70 ppb
2014-09-08	3761-805-0830	4.80 ppb
2014-09-08	3761-806-1130	3.90 ppb
2014-09-08	3761-807-1000	4.00 ppb
2014-12-08	3761-800-0750	ND
2014-12-08	3761-801-1100	ND
2014-12-08	3761-802-0850	1.40 ppb
2014-12-08	3761-803-0905	1.40 ppb
2014-12-08	3761-804-0920	1.80 ppb
2014-12-08	3761-805-0845	1.50 ppb
2014-12-08	3761-806-1000	1.30 ppb
2014-12-08	3761-807-1050	1.40 ppb
2015-03-02	3761-800-0750	ND
2015-03-02	3761-801-0800	ND
2015-03-02	3761-802-0840	ND
2015-03-02	3761-803-0850	ND
2015-03-02	3761-804-0920	2.10 ppb
2015-03-02	3761-805-0955	ND
2015-03-02	3761-806-1120	2.30 ppb
2015-03-02	3761-807-1150	ND
2015-06-08	3761-800-0800	2.90 ppb
2015-06-08	3761-801-0815	2.90 ppb
2015-06-08	3761-802-0845	3.00 ppb
2015-06-08	3761-803-0900	2.90 ppb
2015-06-08	3761-804-1000	3.70 ppb
2015-06-08	3761-805-0930	3.90 ppb
2015-06-08	3761-806-1100	2.50 ppb
2015-06-08	3761-807-1140	2.80 ppb
2015-09-14	3761-800-0745	4.60 ppb
2015-09-14	3761-801-0755	4.70 ppb
2015-09-14	3761-802-0820	4.00 ppb
2015-09-14	3761-803-0840	3.60 ppb
2015-09-14	3761-804-0930	3.00 ppb
2015-09-14	3761-805-0905	4.10 ppb
2015-09-14	3761-806-1040	4.30 ppb
2015-09-14	3761-807-1115	3.80 ppb
2015-12-14	3761-800-0805	ND
2015-12-14	3761-801-0815	ND
2015-12-14	3761-802-0845	ND
2015-12-14	3761-803-0905	ND
2015-12-14	3761-804-1020	2.10 ppb
2015-12-14	3761-805-0955	2.20 ppb
2015-12-14	3761-806-1120	2.70 ppb
2015-12-14	3761-807-1205	ND
2016-03-14	3761-800-0800	ND
2016-03-14	3761-801-0815	ND
2016-03-14	3761-802-0845	ND
2016-03-14	3761-803-0900	ND
2016-03-14	3761-804-1005	1.70 ppb
2016-03-14	3761-805-0945	1.10 ppb
2016-03-14	3761-806-1120	1.10 ppb
2016-03-14	3761-807-1215	ND
2016-06-13	3761-800-0800	3.50 ppb
2016-06-13	3761-801-0810	3.70 ppb
2016-06-13	3761-802-0845	3.70 ppb
2016-06-13	3761-803-0900	3.80 ppb
2016-06-13	3761-804-1005	3.90 ppb
2016-06-13	3761-805-0935	3.50 ppb
2016-06-13	3761-806-1105	4.10 ppb
2016-06-13	3761-807-1140	3.90 ppb
2016-09-12	3761-800-0805	4.50 ppb
2016-09-12	3761-801-0820	4.50 ppb
2016-09-12	3761-802-0845	5.00 ppb
2016-09-12	3761-803-0745	5.10 ppb
2016-09-12	3761-804-0900	4.60 ppb
2016-09-12	3761-805-0930	5.10 ppb
2016-09-12	3761-806-1035	4.90 ppb
2016-09-12	3761-807-1130	4.90 ppb
2016-12-12	3761-800-0800	2.10 ppb
2016-12-12	3761-801-0810	2.40 ppb
2016-12-12	3761-802-0830	1.80 ppb
2016-12-12	3761-803-0850	1.80 ppb
2016-12-12	3761-804-0935	1.40 ppb
2016-12-12	3761-805-0915	1.80 ppb
2016-12-12	3761-806-1100	2.10 ppb
2016-12-12	3761-807-1140	1.90 ppb
2017-03-13	3761-800-0815	11.8 ppb
2017-03-13	3761-801-0830	11.3 ppb
2017-03-13	3761-802-0900	11.1 ppb
2017-03-13	3761-803-0925	11.1 ppb
2017-03-13	3761-804-1015	11.3 ppb
2017-03-13	3761-805-0955	11.6 ppb
2017-03-13	3761-806-1115	12.5 ppb
2017-03-13	3761-807-1145	11.5 ppb
2017-09-11	3761-800-0800	5.40 ppb
2017-09-11	3761-801-0815	5.70 ppb
2017-09-11	3761-802-0840	5.00 ppb
2017-09-11	3761-803-0855	6.60 ppb
2017-09-11	3761-804-0950	7.30 ppb
2017-09-11	3761-805-0920	7.50 ppb
2017-09-11	3761-806-1100	5.80 ppb
2017-09-11	3761-807-1145	6.00 ppb
2017-12-11	3761-800-0800	ND
2017-12-11	3761-801-0810	ND
2017-12-11	3761-802-0830	ND
2017-12-11	3761-803-0845	ND
2017-12-11	3761-804-0900	ND
2017-12-11	3761-805-0940	1.000 ppb
2017-12-11	3761-806-1040	ND
2017-12-11	3761-807-1125	ND
2018-03-12	3761-800-0800	ND
2018-03-12	3761-801-0810	ND
2018-03-12	3761-802-0835	ND
2018-03-12	3761-803-0850	ND
2018-03-12	3761-804-0945	2.30 ppb
2018-03-12	3761-805-0920	1.000 ppb
2018-03-12	3761-806-1045	1.30 ppb
2018-03-12	3761-807-1135	ND
2018-06-11	3761-800-0800	ND
2018-06-11	3761-801-0810	ND
2018-06-11	3761-802-0830	ND
2018-06-11	3761-803-0840	ND
2018-06-11	3761-804-0940	2.70 ppb
2018-06-11	3761-805-0910	ND
2018-06-11	3761-806-1035	2.20 ppb
2018-06-11	3761-807-1120	1.50 ppb
2018-09-10	3761-800-0800	1.70 ppb
2018-09-10	3761-801-0815	2.20 ppb
2018-09-10	3761-802-0840	1.70 ppb
2018-09-10	3761-803-0855	1.60 ppb
2018-09-10	3761-804-0945	1.000 ppb
2018-09-10	3761-805-0920	1.70 ppb
2018-09-10	3761-806-1050	2.20 ppb
2018-09-10	3761-807-1130	1.70 ppb
2018-12-10	3761-800-0800	1.20 ppb
2018-12-10	3761-801-0810	ND
2018-12-10	3761-802-0900	ND
2018-12-10	3761-803-0935	ND
2018-12-10	3761-804-1015	1.50 ppb
2018-12-10	3761-805-0920	ND
2018-12-10	3761-806-1120	1.10 ppb
2018-12-10	3761-807-1150	ND
2019-03-11	3761-800-0810	ND
2019-03-11	3761-801-0825	ND
2019-03-11	3761-802-0850	ND
2019-03-11	3761-803-0900	ND
2019-03-11	3761-804-0950	3.50 ppb
2019-03-11	3761-805-0925	1.70 ppb
2019-03-11	3761-806-1050	1.50 ppb
2019-03-11	3761-807-1130	ND
2019-06-10	3761-800-0750	ND
2019-06-10	3761-801-0800	ND
2019-06-10	3761-802-0830	ND
2019-06-10	3761-803-0850	ND
2019-06-10	3761-804-0945	1.60 ppb
2019-06-10	3761-805-0920	ND
2019-06-10	3761-806-1105	2.60 ppb
2019-06-10	3761-807-1150	ND
2019-09-09	3761-800-0826	1.30 ppb
2019-09-09	3761-801-0840	1.30 ppb
2019-09-09	3761-802-0910	1.20 ppb
2019-09-09	3761-803-0925	1.20 ppb
2019-09-09	3761-804-1025	1.10 ppb
2019-09-09	3761-805-1000	ND
2019-09-09	3761-806-1205	1.20 ppb
2019-09-09	3761-807-1245	1.20 ppb
2019-12-09	3761-800-0835	ND
2019-12-09	3761-801-0855	ND
2019-12-09	3761-802-0925	ND
2019-12-09	3761-803-1000	ND
2019-12-09	3761-804-1105	1.20 ppb
2019-12-09	3761-805-1030	ND
2019-12-09	3761-806-1220	1.20 ppb
2019-12-09	3761-807-1255	ND