Trichloroacetic acid

Sulphur Water System

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)

108

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.192 ppb	24	4	ND - 1.30 ppb
2015	0.533 ppb	32	14	ND - 1.70 ppb
2016	0.108 ppb	32	4	ND - 0.930 ppb
2017	0.518 ppb	32	22	ND - 0.950 ppb
2018	1.12 ppb	32	32	0.880 ppb - 1.50 ppb
2019	0.859 ppb	32	32	0.690 ppb - 1.13 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
2014-05-21	L0043246-01	ND
2014-05-21	L0043246-02	ND
2014-05-21	L0043246-03	ND
2014-05-21	L0043246-04	ND
2014-05-21	L0043246-01	ND
2014-05-21	L0043246-02	ND
2014-05-21	L0043246-03	ND
2014-05-21	L0043246-04	ND
2014-08-13	L0046638-01	ND
2014-08-13	L0046638-02	ND
2014-08-13	L0046638-03	ND
2014-08-13	L0046638-04	ND
2014-08-13	L0046638-01	ND
2014-08-13	L0046638-02	ND
2014-08-13	L0046638-03	ND
2014-08-13	L0046638-04	ND
2014-11-18	L0050771-01	1.000 ppb
2014-11-18	L0050771-02	ND
2014-11-18	L0050771-03	1.30 ppb
2014-11-18	L0050771-04	ND
2014-11-18	L0050771-01	1.000 ppb
2014-11-18	L0050771-02	ND
2014-11-18	L0050771-03	1.30 ppb
2014-11-18	L0050771-04	ND
2015-02-12	LA3487-1	ND
2015-02-12	LA3487-2	ND
2015-02-12	LA3487-3	ND
2015-02-12	LA3487-4	ND
2015-02-12	LA3487-1	ND
2015-02-12	LA3487-2	ND
2015-02-12	LA3487-3	ND
2015-02-12	LA3487-4	ND
2015-05-21	LA7268-1	1.20 ppb
2015-05-21	LA7268-2	1.20 ppb
2015-05-21	LA7268-3	1.70 ppb
2015-05-21	LA7268-4	1.20 ppb
2015-05-21	LA7268-1	1.20 ppb
2015-05-21	LA7268-2	1.20 ppb
2015-05-21	LA7268-3	1.70 ppb
2015-05-21	LA7268-4	1.20 ppb
2015-09-09	LA11381-1	1.10 ppb
2015-09-09	LA11381-2	ND
2015-09-09	LA11381-3	0.820 ppb
2015-09-09	LA11381-4	1.30 ppb
2015-09-09	LA11381-1	1.10 ppb
2015-09-09	LA11381-2	ND
2015-09-09	LA11381-3	0.820 ppb
2015-09-09	LA11381-4	1.30 ppb
2015-12-03	LA14715-1	ND
2015-12-03	LA14715-2	ND
2015-12-03	LA14715-3	ND
2015-12-03	LA14715-4	ND
2015-12-03	LA14715-1	ND
2015-12-03	LA14715-2	ND
2015-12-03	LA14715-3	ND
2015-12-03	LA14715-4	ND
2016-02-23	LA17652-1	ND
2016-02-23	LA17652-2	ND
2016-02-23	LA17652-3	ND
2016-02-23	LA17652-4	ND
2016-02-23	LA17652-1	ND
2016-02-23	LA17652-2	ND
2016-02-23	LA17652-3	ND
2016-02-23	LA17652-4	ND
2016-05-17	LA20834-1	ND
2016-05-17	LA20834-2	ND
2016-05-17	LA20834-3	ND
2016-05-17	LA20834-4	ND
2016-05-17	LA20834-1	ND
2016-05-17	LA20834-2	ND
2016-05-17	LA20834-3	ND
2016-05-17	LA20834-4	ND
2016-08-16	LA24340-1	ND
2016-08-16	LA24340-2	0.800 ppb
2016-08-16	LA24340-3	ND
2016-08-16	LA24340-4	0.930 ppb
2016-08-16	LA24340-1	ND
2016-08-16	LA24340-2	0.800 ppb
2016-08-16	LA24340-3	ND
2016-08-16	LA24340-4	0.930 ppb
2016-11-29	LA28117-1	ND
2016-11-29	LA28117-2	ND
2016-11-29	LA28118-1	ND
2016-11-29	LA28118-2	ND
2016-11-29	LA28117-1	ND
2016-11-29	LA28117-2	ND
2016-11-29	LA28118-1	ND
2016-11-29	LA28118-2	ND
2017-02-10	35294574001	0.710 ppb
2017-02-10	35294574002	ND
2017-02-10	35294574003	ND
2017-02-10	35294574004	0.630 ppb
2017-02-10	35294574001	0.710 ppb
2017-02-10	35294574002	ND
2017-02-10	35294574003	ND
2017-02-10	35294574004	0.630 ppb
2017-05-12	35312127005	0.640 ppb
2017-05-12	35312127006	0.860 ppb
2017-05-12	35312127007	0.880 ppb
2017-05-12	35312127008	0.860 ppb
2017-05-12	35312127005	0.640 ppb
2017-05-12	35312127006	0.860 ppb
2017-05-12	35312127007	0.880 ppb
2017-05-12	35312127008	0.860 ppb
2017-08-04	35328360001	0.510 ppb
2017-08-04	35328360002	ND
2017-08-04	35328360003	ND
2017-08-04	35328360004	ND
2017-08-04	35328360001	0.510 ppb
2017-08-04	35328360002	ND
2017-08-04	35328360003	ND
2017-08-04	35328360004	ND
2017-11-02	35346180001	0.730 ppb
2017-11-02	35346180002	0.810 ppb
2017-11-02	35346180003	0.700 ppb
2017-11-02	35346180004	0.950 ppb
2017-11-02	35346180001	0.730 ppb
2017-11-02	35346180002	0.810 ppb
2017-11-02	35346180003	0.700 ppb
2017-11-02	35346180004	0.950 ppb
2018-02-09	35374053001	1.30 ppb
2018-02-09	35374053002	1.40 ppb
2018-02-09	35374053003	1.30 ppb
2018-02-09	35374053004	1.50 ppb
2018-02-09	35374053001	1.30 ppb
2018-02-09	35374053002	1.40 ppb
2018-02-09	35374053003	1.30 ppb
2018-02-09	35374053004	1.50 ppb
2018-05-02	35390319001	1.10 ppb
2018-05-02	35390319002	1.10 ppb
2018-05-02	35390319003	1.10 ppb
2018-05-02	35390319004	1.10 ppb
2018-05-02	35390319001	1.10 ppb
2018-05-02	35390319002	1.10 ppb
2018-05-02	35390319003	1.10 ppb
2018-05-02	35390319004	1.10 ppb
2018-08-08	35409908001	0.880 ppb
2018-08-08	35409908002	1.20 ppb
2018-08-08	35409908003	0.970 ppb
2018-08-08	35409908004	0.960 ppb
2018-08-08	35409908001	0.880 ppb
2018-08-08	35409908002	1.20 ppb
2018-08-08	35409908003	0.970 ppb
2018-08-08	35409908004	0.960 ppb
2018-11-08	35430428001	1.10 ppb
2018-11-08	35430428002	0.940 ppb
2018-11-08	35430428003	0.950 ppb
2018-11-08	35430428004	0.980 ppb
2018-11-08	35430428001	1.10 ppb
2018-11-08	35430428002	0.940 ppb
2018-11-08	35430428003	0.950 ppb
2018-11-08	35430428004	0.980 ppb
2019-02-06	35447077001	0.860 ppb
2019-02-06	35447077002	0.870 ppb
2019-02-06	35447077003	0.850 ppb
2019-02-06	35447077004	0.860 ppb
2019-02-06	35447077001	0.860 ppb
2019-02-06	35447077002	0.870 ppb
2019-02-06	35447077003	0.850 ppb
2019-02-06	35447077004	0.860 ppb
2019-05-02	35466136001	0.740 ppb
2019-05-02	35466136002	0.690 ppb
2019-05-02	35466136003	0.990 ppb
2019-05-02	35466136004	0.990 ppb
2019-05-02	35466136001	0.740 ppb
2019-05-02	35466136002	0.690 ppb
2019-05-02	35466136003	0.990 ppb
2019-05-02	35466136004	0.990 ppb
2019-08-08	35489016001	0.959 ppb
2019-08-08	35489016002	1.13 ppb
2019-08-08	35489016003	0.777 ppb
2019-08-08	35489016004	0.804 ppb
2019-08-08	35489016001	0.959 ppb
2019-08-08	35489016002	1.13 ppb
2019-08-08	35489016003	0.777 ppb
2019-08-08	35489016004	0.804 ppb
2019-11-14	35512857001	0.830 ppb
2019-11-14	35512857002	0.840 ppb
2019-11-14	35512857003	0.790 ppb
2019-11-14	35512857004	0.770 ppb
2019-11-14	35512857001	0.830 ppb
2019-11-14	35512857002	0.840 ppb
2019-11-14	35512857003	0.790 ppb
2019-11-14	35512857004	0.770 ppb