Monochloroacetic acid

Thibodaux Waterworks

Monochloroacetic 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

216

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	2.22 ppb	32	28	ND - 3.80 ppb
2015	0.923 ppb	56	38	ND - 2.40 ppb
2016	0.539 ppb	32	16	ND - 1.60 ppb
2017	0.381 ppb	32	8	ND - 1.70 ppb
2018	0.706 ppb	32	10	ND - 2.90 ppb
2019	2.01 ppb	32	32	1.30 ppb - 3.10 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic 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.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-12	680-98602-1	2.70 ppb
2014-02-12	680-98602-2	3.80 ppb
2014-02-12	680-98602-3	2.70 ppb
2014-02-12	680-98602-4	3.20 ppb
2014-02-12	680-98602-1	2.70 ppb
2014-02-12	680-98602-2	3.80 ppb
2014-02-12	680-98602-3	2.70 ppb
2014-02-12	680-98602-4	3.20 ppb
2014-05-06	680-101187-12	3.60 ppb
2014-05-06	680-101187-7	3.30 ppb
2014-05-06	680-101187-8	3.10 ppb
2014-05-06	680-101187-9	3.00 ppb
2014-05-06	680-101187-12	3.60 ppb
2014-05-06	680-101187-7	3.30 ppb
2014-05-06	680-101187-8	3.10 ppb
2014-05-06	680-101187-9	3.00 ppb
2014-08-04	680-104089-15	2.40 ppb
2014-08-04	680-104089-16	2.10 ppb
2014-08-04	680-104089-17	1.70 ppb
2014-08-04	680-104089-18	2.70 ppb
2014-08-04	680-104089-15	2.40 ppb
2014-08-04	680-104089-16	2.10 ppb
2014-08-04	680-104089-17	1.70 ppb
2014-08-04	680-104089-18	2.70 ppb
2014-11-17	680-107376-1	ND
2014-11-17	680-107376-2	0.580 ppb
2014-11-17	680-107376-3	ND
2014-11-17	680-107376-4	0.580 ppb
2014-11-17	680-107376-1	ND
2014-11-17	680-107376-2	0.580 ppb
2014-11-17	680-107376-3	ND
2014-11-17	680-107376-4	0.580 ppb
2015-01-27	680-109415-1	1.20 ppb
2015-01-27	680-109415-2	1.70 ppb
2015-01-27	680-109415-3	1.20 ppb
2015-01-27	680-109415-4	1.60 ppb
2015-01-27	680-109415-1	1.20 ppb
2015-01-27	680-109415-2	1.70 ppb
2015-01-27	680-109415-3	1.20 ppb
2015-01-27	680-109415-4	1.60 ppb
2015-02-10	680-109832-1	ND
2015-02-10	680-109832-2	ND
2015-02-10	680-109832-3	ND
2015-02-10	680-109832-4	ND
2015-02-10	LA3444-1	ND
2015-02-10	LA3444-2	ND
2015-02-10	LA3444-3	ND
2015-02-10	LA3444-4	ND
2015-02-10	680-109832-1	ND
2015-02-10	680-109832-2	ND
2015-02-10	680-109832-3	ND
2015-02-10	680-109832-4	ND
2015-02-10	LA3444-1	ND
2015-02-10	LA3444-2	ND
2015-02-10	LA3444-3	ND
2015-02-10	LA3444-4	ND
2015-05-20	680-112821-1	0.430 ppb
2015-05-20	680-112821-2	0.520 ppb
2015-05-20	680-112821-3	0.770 ppb
2015-05-20	680-112821-4	ND
2015-05-20	LA7270-1	2.40 ppb
2015-05-20	LA7270-2	2.20 ppb
2015-05-20	LA7270-3	1.20 ppb
2015-05-20	LA7270-4	1.30 ppb
2015-05-20	680-112821-1	0.430 ppb
2015-05-20	680-112821-2	0.520 ppb
2015-05-20	680-112821-3	0.770 ppb
2015-05-20	680-112821-4	ND
2015-05-20	LA7270-1	2.40 ppb
2015-05-20	LA7270-2	2.20 ppb
2015-05-20	LA7270-3	1.20 ppb
2015-05-20	LA7270-4	1.30 ppb
2015-08-06	680-115401-1	1.60 ppb
2015-08-06	680-115401-2	1.10 ppb
2015-08-06	680-115401-3	0.930 ppb
2015-08-06	680-115401-4	1.50 ppb
2015-08-06	680-115401-1	1.60 ppb
2015-08-06	680-115401-2	1.10 ppb
2015-08-06	680-115401-3	0.930 ppb
2015-08-06	680-115401-4	1.50 ppb
2015-11-02	680-118696-5	1.50 ppb
2015-11-02	680-118696-6	1.70 ppb
2015-11-02	680-118696-7	1.70 ppb
2015-11-02	680-118696-8	1.30 ppb
2015-11-02	680-118696-5	1.50 ppb
2015-11-02	680-118696-6	1.70 ppb
2015-11-02	680-118696-7	1.70 ppb
2015-11-02	680-118696-8	1.30 ppb
2016-02-01	680-121528-5	1.10 ppb
2016-02-01	680-121528-6	1.30 ppb
2016-02-01	680-121528-7	0.820 ppb
2016-02-01	680-121528-8	1.60 ppb
2016-02-01	680-121528-5	1.10 ppb
2016-02-01	680-121528-6	1.30 ppb
2016-02-01	680-121528-7	0.820 ppb
2016-02-01	680-121528-8	1.60 ppb
2016-05-02	680-124872-5	1.50 ppb
2016-05-02	680-124872-7	0.990 ppb
2016-05-02	680-124872-8	0.810 ppb
2016-05-02	680-124872-9	0.500 ppb
2016-05-02	680-124872-5	1.50 ppb
2016-05-02	680-124872-7	0.990 ppb
2016-05-02	680-124872-8	0.810 ppb
2016-05-02	680-124872-9	0.500 ppb
2016-08-01	680-128316-1	ND
2016-08-01	680-128316-4	ND
2016-08-01	680-128316-5	ND
2016-08-01	680-128316-6	ND
2016-08-01	680-128316-1	ND
2016-08-01	680-128316-4	ND
2016-08-01	680-128316-5	ND
2016-08-01	680-128316-6	ND
2016-11-11	680-132075-1	ND
2016-11-11	680-132075-2	ND
2016-11-11	680-132075-3	ND
2016-11-11	680-132075-4	ND
2016-11-11	680-132075-1	ND
2016-11-11	680-132075-2	ND
2016-11-11	680-132075-3	ND
2016-11-11	680-132075-4	ND
2017-02-02	35292876001	ND
2017-02-02	35292876002	ND
2017-02-02	35292876003	ND
2017-02-02	35292876004	ND
2017-02-02	35292876001	ND
2017-02-02	35292876002	ND
2017-02-02	35292876003	ND
2017-02-02	35292876004	ND
2017-05-08	35311079001	ND
2017-05-08	35311079002	ND
2017-05-08	35311079003	ND
2017-05-08	35311079004	ND
2017-05-08	35311079001	ND
2017-05-08	35311079002	ND
2017-05-08	35311079003	ND
2017-05-08	35311079004	ND
2017-08-01	35327548001	ND
2017-08-01	35327548002	ND
2017-08-01	35327548003	ND
2017-08-01	35327548004	ND
2017-08-01	35327548001	ND
2017-08-01	35327548002	ND
2017-08-01	35327548003	ND
2017-08-01	35327548004	ND
2017-11-01	35345488001	1.60 ppb
2017-11-01	35345488002	1.70 ppb
2017-11-01	35345488003	1.70 ppb
2017-11-01	35345488004	1.10 ppb
2017-11-01	35345488001	1.60 ppb
2017-11-01	35345488002	1.70 ppb
2017-11-01	35345488003	1.70 ppb
2017-11-01	35345488004	1.10 ppb
2018-02-01	35371678001	ND
2018-02-01	35371678002	ND
2018-02-01	35371678003	ND
2018-02-01	35371678004	ND
2018-02-01	35371678001	ND
2018-02-01	35371678002	ND
2018-02-01	35371678003	ND
2018-02-01	35371678004	ND
2018-05-03	35390209001	ND
2018-05-03	35390209002	ND
2018-05-03	35390209003	ND
2018-05-03	35390209004	ND
2018-05-03	35390209001	ND
2018-05-03	35390209002	ND
2018-05-03	35390209003	ND
2018-05-03	35390209004	ND
2018-08-01	35408230001	ND
2018-08-01	35408230002	2.30 ppb
2018-08-01	35408230003	2.20 ppb
2018-08-01	35408230004	2.90 ppb
2018-08-01	35408230001	ND
2018-08-01	35408230002	2.30 ppb
2018-08-01	35408230003	2.20 ppb
2018-08-01	35408230004	2.90 ppb
2018-11-07	35430035001	ND
2018-11-07	35430035002	2.00 ppb
2018-11-07	35430035003	ND
2018-11-07	35430035004	1.90 ppb
2018-11-07	35430035001	ND
2018-11-07	35430035002	2.00 ppb
2018-11-07	35430035003	ND
2018-11-07	35430035004	1.90 ppb
2019-02-05	35446749001	1.40 ppb
2019-02-05	35446749002	1.50 ppb
2019-02-05	35446749003	1.30 ppb
2019-02-05	35446749004	1.40 ppb
2019-02-05	35446749001	1.40 ppb
2019-02-05	35446749002	1.50 ppb
2019-02-05	35446749003	1.30 ppb
2019-02-05	35446749004	1.40 ppb
2019-05-01	35465624001	1.40 ppb
2019-05-01	35465624002	1.80 ppb
2019-05-01	35465624003	1.60 ppb
2019-05-01	35465624004	1.90 ppb
2019-05-01	35465624001	1.40 ppb
2019-05-01	35465624002	1.80 ppb
2019-05-01	35465624003	1.60 ppb
2019-05-01	35465624004	1.90 ppb
2019-08-01	35487283001	2.60 ppb
2019-08-01	35487283002	3.00 ppb
2019-08-01	35487283003	2.80 ppb
2019-08-01	35487283004	3.10 ppb
2019-08-01	35487283001	2.60 ppb
2019-08-01	35487283002	3.00 ppb
2019-08-01	35487283003	2.80 ppb
2019-08-01	35487283004	3.10 ppb
2019-11-07	35510944001	2.00 ppb
2019-11-07	35510944002	2.00 ppb
2019-11-07	35510944003	2.20 ppb
2019-11-07	35510944004	2.20 ppb
2019-11-07	35510944001	2.00 ppb
2019-11-07	35510944002	2.00 ppb
2019-11-07	35510944003	2.20 ppb
2019-11-07	35510944004	2.20 ppb