Monochloroacetic acid

Natchitoches Water System

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
2013	N/A	0	0	N/A
2014	3.40 ppb	32	32	0.940 ppb - 6.30 ppb
2015	3.89 ppb	56	56	0.750 ppb - 8.60 ppb
2016	1.18 ppb	32	16	ND - 3.20 ppb
2017	0.769 ppb	32	8	ND - 3.60 ppb
2018	0.213 ppb	32	4	ND - 1.90 ppb
2019	1.00 ppb	32	20	ND - 2.70 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
2014-03-06	680-99232-6	1.30 ppb
2014-03-06	680-99232-7	1.10 ppb
2014-03-06	680-99232-8	0.940 ppb
2014-03-06	680-99232-9	2.00 ppb
2014-03-06	680-99232-6	1.30 ppb
2014-03-06	680-99232-7	1.10 ppb
2014-03-06	680-99232-8	0.940 ppb
2014-03-06	680-99232-9	2.00 ppb
2014-06-05	680-102053-1	6.30 ppb
2014-06-05	680-102053-2	5.10 ppb
2014-06-05	680-102053-3	5.10 ppb
2014-06-05	680-102053-4	5.60 ppb
2014-06-05	680-102053-1	6.30 ppb
2014-06-05	680-102053-2	5.10 ppb
2014-06-05	680-102053-3	5.10 ppb
2014-06-05	680-102053-4	5.60 ppb
2014-09-04	680-104963-13	5.00 ppb
2014-09-04	680-104963-14	4.40 ppb
2014-09-04	680-104963-15	4.50 ppb
2014-09-04	680-104963-16	4.20 ppb
2014-09-04	680-104963-13	5.00 ppb
2014-09-04	680-104963-14	4.40 ppb
2014-09-04	680-104963-15	4.50 ppb
2014-09-04	680-104963-16	4.20 ppb
2014-12-02	680-107780-10	2.60 ppb
2014-12-02	680-107780-7	1.80 ppb
2014-12-02	680-107780-8	2.60 ppb
2014-12-02	680-107780-9	1.90 ppb
2014-12-02	680-107780-10	2.60 ppb
2014-12-02	680-107780-7	1.80 ppb
2014-12-02	680-107780-8	2.60 ppb
2014-12-02	680-107780-9	1.90 ppb
2015-03-04	680-110515-10	0.750 ppb
2015-03-04	680-110515-7	2.30 ppb
2015-03-04	680-110515-8	2.60 ppb
2015-03-04	680-110515-9	2.50 ppb
2015-03-04	680-110515-10	0.750 ppb
2015-03-04	680-110515-7	2.30 ppb
2015-03-04	680-110515-8	2.60 ppb
2015-03-04	680-110515-9	2.50 ppb
2015-06-05	680-113468-1	4.20 ppb
2015-06-05	680-113468-2	5.60 ppb
2015-06-05	680-113468-3	6.50 ppb
2015-06-05	680-113468-4	6.00 ppb
2015-06-05	680-113468-1	4.20 ppb
2015-06-05	680-113468-2	5.60 ppb
2015-06-05	680-113468-3	6.50 ppb
2015-06-05	680-113468-4	6.00 ppb
2015-06-26	680-114023-1	4.40 ppb
2015-06-26	680-114023-2	3.30 ppb
2015-06-26	680-114023-3	5.80 ppb
2015-06-26	680-114023-4	6.30 ppb
2015-06-26	680-114023-1	4.40 ppb
2015-06-26	680-114023-2	3.30 ppb
2015-06-26	680-114023-3	5.80 ppb
2015-06-26	680-114023-4	6.30 ppb
2015-06-30	680-114108-1	7.80 ppb
2015-06-30	680-114108-2	7.80 ppb
2015-06-30	680-114108-3	7.00 ppb
2015-06-30	680-114108-4	8.60 ppb
2015-06-30	680-114108-1	7.80 ppb
2015-06-30	680-114108-2	7.80 ppb
2015-06-30	680-114108-3	7.00 ppb
2015-06-30	680-114108-4	8.60 ppb
2015-09-30	680-117346-1	2.50 ppb
2015-09-30	680-117346-2	2.70 ppb
2015-09-30	680-117346-3	2.50 ppb
2015-09-30	680-117346-4	4.20 ppb
2015-09-30	680-117346-1	2.50 ppb
2015-09-30	680-117346-2	2.70 ppb
2015-09-30	680-117346-3	2.50 ppb
2015-09-30	680-117346-4	4.20 ppb
2015-12-01	680-119845-1	2.10 ppb
2015-12-01	680-119845-2	1.70 ppb
2015-12-01	680-119845-3	1.50 ppb
2015-12-01	680-119845-4	3.00 ppb
2015-12-01	680-119845-1	2.10 ppb
2015-12-01	680-119845-2	1.70 ppb
2015-12-01	680-119845-3	1.50 ppb
2015-12-01	680-119845-4	3.00 ppb
2015-12-31	680-120573-1	1.80 ppb
2015-12-31	680-120573-2	2.30 ppb
2015-12-31	680-120573-3	1.90 ppb
2015-12-31	680-120573-4	1.40 ppb
2015-12-31	680-120573-1	1.80 ppb
2015-12-31	680-120573-2	2.30 ppb
2015-12-31	680-120573-3	1.90 ppb
2015-12-31	680-120573-4	1.40 ppb
2016-03-02	680-122490-4	2.60 ppb
2016-03-02	680-122490-5	2.50 ppb
2016-03-02	680-122490-6	2.70 ppb
2016-03-02	680-122490-7	1.80 ppb
2016-03-02	680-122490-4	2.60 ppb
2016-03-02	680-122490-5	2.50 ppb
2016-03-02	680-122490-6	2.70 ppb
2016-03-02	680-122490-7	1.80 ppb
2016-06-08	680-126620-1	2.90 ppb
2016-06-08	680-126620-2	3.20 ppb
2016-06-08	680-126620-3	ND
2016-06-08	680-126620-4	2.30 ppb
2016-06-08	680-126620-1	2.90 ppb
2016-06-08	680-126620-2	3.20 ppb
2016-06-08	680-126620-3	ND
2016-06-08	680-126620-4	2.30 ppb
2016-09-08	680-129861-1	ND
2016-09-08	680-129861-2	0.810 ppb
2016-09-08	680-129861-3	ND
2016-09-08	680-129861-4	ND
2016-09-08	680-129861-1	ND
2016-09-08	680-129861-2	0.810 ppb
2016-09-08	680-129861-3	ND
2016-09-08	680-129861-4	ND
2016-12-06	680-132836-10	ND
2016-12-06	680-132836-11	ND
2016-12-06	680-132836-12	ND
2016-12-06	680-132836-13	ND
2016-12-06	680-132836-10	ND
2016-12-06	680-132836-11	ND
2016-12-06	680-132836-12	ND
2016-12-06	680-132836-13	ND
2017-03-02	35298741021	ND
2017-03-02	35298741022	ND
2017-03-02	35298741023	ND
2017-03-02	35298741024	ND
2017-03-02	35298741021	ND
2017-03-02	35298741022	ND
2017-03-02	35298741023	ND
2017-03-02	35298741024	ND
2017-06-27	35321385011	ND
2017-06-27	35321385012	ND
2017-06-27	35321385013	ND
2017-06-27	35321385014	ND
2017-06-27	35321385011	ND
2017-06-27	35321385012	ND
2017-06-27	35321385013	ND
2017-06-27	35321385014	ND
2017-09-14	35335848013	2.60 ppb
2017-09-14	35335848014	3.60 ppb
2017-09-14	35335848015	3.30 ppb
2017-09-14	35335848016	2.80 ppb
2017-09-14	35335848013	2.60 ppb
2017-09-14	35335848014	3.60 ppb
2017-09-14	35335848015	3.30 ppb
2017-09-14	35335848016	2.80 ppb
2017-12-14	35363575001	ND
2017-12-14	35363575002	ND
2017-12-14	35363575003	ND
2017-12-14	35363575004	ND
2017-12-14	35363575001	ND
2017-12-14	35363575002	ND
2017-12-14	35363575003	ND
2017-12-14	35363575004	ND
2018-03-15	35380704001	ND
2018-03-15	35380704002	ND
2018-03-15	35380704003	ND
2018-03-15	35380704004	ND
2018-03-15	35380704001	ND
2018-03-15	35380704002	ND
2018-03-15	35380704003	ND
2018-03-15	35380704004	ND
2018-06-25	35401074001	ND
2018-06-25	35401074002	ND
2018-06-25	35401074003	ND
2018-06-25	35401074004	ND
2018-06-25	35401074001	ND
2018-06-25	35401074002	ND
2018-06-25	35401074003	ND
2018-06-25	35401074004	ND
2018-09-18	35418776001	ND
2018-09-18	35418776002	ND
2018-09-18	35418776003	ND
2018-09-18	35418776004	ND
2018-09-18	35418776001	ND
2018-09-18	35418776002	ND
2018-09-18	35418776003	ND
2018-09-18	35418776004	ND
2018-12-17	35438424001	1.50 ppb
2018-12-17	35438424002	1.90 ppb
2018-12-17	35438424003	ND
2018-12-17	35438424004	ND
2018-12-17	35438424001	1.50 ppb
2018-12-17	35438424002	1.90 ppb
2018-12-17	35438424003	ND
2018-12-17	35438424004	ND
2019-03-07	35453400001	1.50 ppb
2019-03-07	35453400002	1.80 ppb
2019-03-07	35453400003	1.50 ppb
2019-03-07	35453400004	1.90 ppb
2019-03-07	35453400001	1.50 ppb
2019-03-07	35453400002	1.80 ppb
2019-03-07	35453400003	1.50 ppb
2019-03-07	35453400004	1.90 ppb
2019-06-24	35478413001	ND
2019-06-24	35478413002	ND
2019-06-24	35478413003	ND
2019-06-24	35478413004	ND
2019-06-24	35478413001	ND
2019-06-24	35478413002	ND
2019-06-24	35478413003	ND
2019-06-24	35478413004	ND
2019-09-12	35497561001	1.40 ppb
2019-09-12	35497561002	2.70 ppb
2019-09-12	35497561003	ND
2019-09-12	35497561004	1.60 ppb
2019-09-12	35497561001	1.40 ppb
2019-09-12	35497561002	2.70 ppb
2019-09-12	35497561003	ND
2019-09-12	35497561004	1.60 ppb
2019-12-17	35520110001	ND
2019-12-17	35520110002	1.30 ppb
2019-12-17	35520110003	0.930 ppb
2019-12-17	35520110004	1.40 ppb
2019-12-17	35520110001	ND
2019-12-17	35520110002	1.30 ppb
2019-12-17	35520110003	0.930 ppb
2019-12-17	35520110004	1.40 ppb