Trichloroacetic acid

Zachary 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

192

Samples

Samples exceeding legal limit (MCL)

166

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	1.44 ppb	32	26	ND - 5.00 ppb
2015	1.11 ppb	32	28	ND - 2.40 ppb
2016	1.43 ppb	32	32	0.540 ppb - 2.90 ppb
2017	0.971 ppb	32	26	ND - 2.60 ppb
2018	0.781 ppb	32	22	ND - 1.90 ppb
2019	1.16 ppb	32	32	0.600 ppb - 2.10 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
2014-02-03	680-98429-12	1.10 ppb
2014-02-03	680-98429-14	1.40 ppb
2014-02-03	680-98429-15	2.20 ppb
2014-02-03	680-98429-12	1.10 ppb
2014-02-03	680-98429-14	1.40 ppb
2014-02-03	680-98429-15	2.20 ppb
2014-02-04	680-98429-13	2.10 ppb
2014-02-04	680-98429-13	2.10 ppb
2014-05-07	680-101146-1	0.620 ppb
2014-05-07	680-101146-2	5.00 ppb
2014-05-07	680-101146-3	0.990 ppb
2014-05-07	680-101146-4	1.20 ppb
2014-05-07	680-101146-1	0.620 ppb
2014-05-07	680-101146-2	5.00 ppb
2014-05-07	680-101146-3	0.990 ppb
2014-05-07	680-101146-4	1.20 ppb
2014-08-18	680-104374-3	3.00 ppb
2014-08-18	680-104374-4	ND
2014-08-18	680-104374-5	ND
2014-08-18	680-104374-6	0.710 ppb
2014-08-18	680-104374-3	3.00 ppb
2014-08-18	680-104374-4	ND
2014-08-18	680-104374-5	ND
2014-08-18	680-104374-6	0.710 ppb
2014-11-28	680-107936-1	0.750 ppb
2014-11-28	680-107936-2	1.10 ppb
2014-11-28	680-107936-3	ND
2014-11-28	680-107936-4	2.90 ppb
2014-11-28	680-107936-1	0.750 ppb
2014-11-28	680-107936-2	1.10 ppb
2014-11-28	680-107936-3	ND
2014-11-28	680-107936-4	2.90 ppb
2015-02-24	680-110191-1	ND
2015-02-24	680-110191-2	0.580 ppb
2015-02-24	680-110191-3	ND
2015-02-24	680-110191-4	0.980 ppb
2015-02-24	680-110191-1	ND
2015-02-24	680-110191-2	0.580 ppb
2015-02-24	680-110191-3	ND
2015-02-24	680-110191-4	0.980 ppb
2015-05-26	680-112991-1	0.800 ppb
2015-05-26	680-112991-2	2.10 ppb
2015-05-26	680-112991-3	0.790 ppb
2015-05-26	680-112991-4	1.000 ppb
2015-05-26	680-112991-1	0.800 ppb
2015-05-26	680-112991-2	2.10 ppb
2015-05-26	680-112991-3	0.790 ppb
2015-05-26	680-112991-4	1.000 ppb
2015-08-05	680-115334-1	0.770 ppb
2015-08-05	680-115334-2	1.50 ppb
2015-08-05	680-115334-3	0.630 ppb
2015-08-05	680-115334-4	0.990 ppb
2015-08-05	680-115334-1	0.770 ppb
2015-08-05	680-115334-2	1.50 ppb
2015-08-05	680-115334-3	0.630 ppb
2015-08-05	680-115334-4	0.990 ppb
2015-11-09	680-118907-10	1.90 ppb
2015-11-09	680-118907-11	2.40 ppb
2015-11-09	680-118907-12	1.10 ppb
2015-11-09	680-118907-9	2.20 ppb
2015-11-09	680-118907-10	1.90 ppb
2015-11-09	680-118907-11	2.40 ppb
2015-11-09	680-118907-12	1.10 ppb
2015-11-09	680-118907-9	2.20 ppb
2016-02-16	680-122002-1	0.730 ppb
2016-02-16	680-122002-2	1.40 ppb
2016-02-16	680-122002-3	1.10 ppb
2016-02-16	680-122002-4	1.20 ppb
2016-02-16	680-122002-1	0.730 ppb
2016-02-16	680-122002-2	1.40 ppb
2016-02-16	680-122002-3	1.10 ppb
2016-02-16	680-122002-4	1.20 ppb
2016-05-20	680-125729-1	1.30 ppb
2016-05-20	680-125729-2	2.90 ppb
2016-05-20	680-125729-3	0.720 ppb
2016-05-20	680-125729-4	1.20 ppb
2016-05-20	680-125729-1	1.30 ppb
2016-05-20	680-125729-2	2.90 ppb
2016-05-20	680-125729-3	0.720 ppb
2016-05-20	680-125729-4	1.20 ppb
2016-08-09	680-128555-1	2.50 ppb
2016-08-09	680-128555-2	2.60 ppb
2016-08-09	680-128555-3	2.20 ppb
2016-08-09	680-128555-4	1.10 ppb
2016-08-09	680-128555-1	2.50 ppb
2016-08-09	680-128555-2	2.60 ppb
2016-08-09	680-128555-3	2.20 ppb
2016-08-09	680-128555-4	1.10 ppb
2016-11-07	680-131872-1	0.540 ppb
2016-11-07	680-131872-2	1.90 ppb
2016-11-07	680-131872-3	0.600 ppb
2016-11-07	680-131872-4	0.960 ppb
2016-11-07	680-131872-1	0.540 ppb
2016-11-07	680-131872-2	1.90 ppb
2016-11-07	680-131872-3	0.600 ppb
2016-11-07	680-131872-4	0.960 ppb
2017-02-09	35294573002	ND
2017-02-09	35294573003	0.950 ppb
2017-02-09	35294573004	ND
2017-02-09	35294573005	0.930 ppb
2017-02-09	35294573002	ND
2017-02-09	35294573003	0.950 ppb
2017-02-09	35294573004	ND
2017-02-09	35294573005	0.930 ppb
2017-05-05	35310607001	0.700 ppb
2017-05-05	35310607002	2.40 ppb
2017-05-05	35310607003	ND
2017-05-05	35310607004	1.20 ppb
2017-05-05	35310607001	0.700 ppb
2017-05-05	35310607002	2.40 ppb
2017-05-05	35310607003	ND
2017-05-05	35310607004	1.20 ppb
2017-08-10	35330068001	0.850 ppb
2017-08-10	35330068002	2.10 ppb
2017-08-10	35330068003	0.570 ppb
2017-08-10	35330068004	0.720 ppb
2017-08-10	35330068001	0.850 ppb
2017-08-10	35330068002	2.10 ppb
2017-08-10	35330068003	0.570 ppb
2017-08-10	35330068004	0.720 ppb
2017-11-02	35346239001	0.910 ppb
2017-11-02	35346239002	2.60 ppb
2017-11-02	35346239003	0.980 ppb
2017-11-02	35346239004	0.630 ppb
2017-11-02	35346239001	0.910 ppb
2017-11-02	35346239002	2.60 ppb
2017-11-02	35346239003	0.980 ppb
2017-11-02	35346239004	0.630 ppb
2018-02-01	35371906001	ND
2018-02-01	35371906002	1.90 ppb
2018-02-01	35371906003	ND
2018-02-01	35371906004	0.980 ppb
2018-02-01	35371906001	ND
2018-02-01	35371906002	1.90 ppb
2018-02-01	35371906003	ND
2018-02-01	35371906004	0.980 ppb
2018-05-04	35390335001	1.10 ppb
2018-05-04	35390335002	1.70 ppb
2018-05-04	35390335003	0.810 ppb
2018-05-04	35390335004	1.10 ppb
2018-05-04	35390335001	1.10 ppb
2018-05-04	35390335002	1.70 ppb
2018-05-04	35390335003	0.810 ppb
2018-05-04	35390335004	1.10 ppb
2018-08-17	35412007001	ND
2018-08-17	35412007002	1.80 ppb
2018-08-17	35412007003	ND
2018-08-17	35412007004	ND
2018-08-17	35412007001	ND
2018-08-17	35412007002	1.80 ppb
2018-08-17	35412007003	ND
2018-08-17	35412007004	ND
2018-11-02	35428205001	0.730 ppb
2018-11-02	35428205002	0.740 ppb
2018-11-02	35428205003	0.700 ppb
2018-11-02	35428205004	0.930 ppb
2018-11-02	35428205001	0.730 ppb
2018-11-02	35428205002	0.740 ppb
2018-11-02	35428205003	0.700 ppb
2018-11-02	35428205004	0.930 ppb
2019-02-01	35445755001	1.40 ppb
2019-02-01	35445755002	2.10 ppb
2019-02-01	35445755003	0.900 ppb
2019-02-01	35445755004	0.970 ppb
2019-02-01	35445755001	1.40 ppb
2019-02-01	35445755002	2.10 ppb
2019-02-01	35445755003	0.900 ppb
2019-02-01	35445755004	0.970 ppb
2019-05-01	35465408001	0.950 ppb
2019-05-01	35465408002	1.80 ppb
2019-05-01	35465408003	0.920 ppb
2019-05-01	35465408004	0.880 ppb
2019-05-01	35465408001	0.950 ppb
2019-05-01	35465408002	1.80 ppb
2019-05-01	35465408003	0.920 ppb
2019-05-01	35465408004	0.880 ppb
2019-08-19	35493980001	0.850 ppb
2019-08-19	35493980002	1.40 ppb
2019-08-19	35493980003	0.600 ppb
2019-08-19	35493980004	0.910 ppb
2019-08-19	35493980001	0.850 ppb
2019-08-19	35493980002	1.40 ppb
2019-08-19	35493980003	0.600 ppb
2019-08-19	35493980004	0.910 ppb
2019-11-05	35510875001	0.740 ppb
2019-11-05	35510875002	1.70 ppb
2019-11-05	35510875003	1.10 ppb
2019-11-05	35510875004	1.30 ppb
2019-11-05	35510875001	0.740 ppb
2019-11-05	35510875002	1.70 ppb
2019-11-05	35510875003	1.10 ppb
2019-11-05	35510875004	1.30 ppb