Monochloroacetic acid

Kent County Water Authority

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

192

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	4.46 ppb	32	27	ND - 46.0 ppb
2015	0.756 ppb	32	16	ND - 2.30 ppb
2016	1.75 ppb	32	26	ND - 4.60 ppb
2017	1.53 ppb	32	17	ND - 3.90 ppb
2018	1.94 ppb	32	12	ND - 8.70 ppb
2019	0.847 ppb	32	10	ND - 4.40 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
2014-02-19	1401517-01_PE27	ND
2014-02-19	1401517-02_PE27	20.0 ppb
2014-02-19	1401517-03_PE27	ND
2014-02-19	1401517-04_PE27	8.40 ppb
2014-02-19	1401517-05_PE27	14.0 ppb
2014-02-19	1401517-06_PE27	46.0 ppb
2014-02-19	1401517-07_PE27	1.50 ppb
2014-02-19	1401517-08_PE27	14.0 ppb
2014-05-14	1402678-05_PE27	0.850 ppb
2014-05-14	1402678-06_PE27	1.60 ppb
2014-05-14	1402678-08_PE27	0.760 ppb
2014-05-14	1402678-09_PE27	ND
2014-05-14	1402678-10_PE27	1.10 ppb
2014-05-14	1402678-11_PE27	ND
2014-05-14	1402678-07_PE27	ND
2014-05-15	1402693-03_PE27	2.80 ppb
2014-08-14	1408-18110-001	2.10 ppb
2014-08-14	1408-18110-002	2.80 ppb
2014-08-14	1408-18110-003	2.70 ppb
2014-08-14	1408-18110-004	2.40 ppb
2014-08-14	1408-18110-005	2.20 ppb
2014-08-14	1408-18110-006	1.80 ppb
2014-08-14	1408-18110-007	1.90 ppb
2014-08-14	1408-18110-008	1.30 ppb
2014-11-18	1411-25894-001	1.70 ppb
2014-11-18	1411-25894-002	2.00 ppb
2014-11-18	1411-25894-003	1.70 ppb
2014-11-18	1411-25894-004	2.00 ppb
2014-11-18	1411-25894-005	1.90 ppb
2014-11-18	1411-25894-006	1.80 ppb
2014-11-18	1411-25894-007	1.90 ppb
2014-11-18	1411-25894-008	1.40 ppb
2015-02-18	1502-03356-001	1.30 ppb
2015-02-18	1502-03356-002	1.30 ppb
2015-02-18	1502-03356-003	1.10 ppb
2015-02-18	1502-03356-004	1.20 ppb
2015-02-18	1502-03356-005	1.50 ppb
2015-02-18	1502-03356-006	ND
2015-02-18	1502-03356-007	1.30 ppb
2015-02-18	1502-03356-008	ND
2015-05-13	1505-08683-004	1.80 ppb
2015-05-13	1505-09683-001	1.80 ppb
2015-05-13	1505-09683-002	2.30 ppb
2015-05-13	1505-09683-003	2.00 ppb
2015-05-13	1505-09683-005	1.90 ppb
2015-05-13	1505-09683-006	1.70 ppb
2015-05-13	1505-09683-007	1.40 ppb
2015-05-13	1505-09683-008	1.50 ppb
2015-08-19	1508-17646-001	ND
2015-08-19	1508-17646-002	ND
2015-08-19	1508-17646-003	1.000 ppb
2015-08-19	1508-17646-004	ND
2015-08-19	1508-17646-005	1.10 ppb
2015-08-19	1508-17646-006	ND
2015-08-19	1508-17646-007	ND
2015-08-19	1508-17646-008	ND
2015-11-17	1511-24948-001	ND
2015-11-17	1511-24948-002	ND
2015-11-17	1511-24948-003	ND
2015-11-17	1511-24948-004	ND
2015-11-17	1511-24948-005	ND
2015-11-17	1511-24948-006	ND
2015-11-17	1511-24948-007	ND
2015-11-17	1511-24948-008	ND
2016-02-17	1602-03675-001	1.10 ppb
2016-02-17	1602-03675-002	1.20 ppb
2016-02-17	1602-03675-003	1.000 ppb
2016-02-17	1602-03675-004	1.30 ppb
2016-02-17	1602-03675-005	1.30 ppb
2016-02-17	1602-03675-006	1.20 ppb
2016-02-17	1602-03675-007	ND
2016-02-17	1602-03675-008	ND
2016-05-18	1605-11327-001	1.10 ppb
2016-05-18	1605-11327-002	1.30 ppb
2016-05-18	1605-11327-003	ND
2016-05-18	1605-11327-004	1.30 ppb
2016-05-18	1605-11327-005	1.000 ppb
2016-05-18	1605-11327-006	1.40 ppb
2016-05-18	1605-11327-007	1.40 ppb
2016-05-18	1605-11327-008	ND
2016-08-17	1608-19347-001	2.60 ppb
2016-08-17	1608-19347-002	2.30 ppb
2016-08-17	1608-19347-003	2.40 ppb
2016-08-17	1608-19347-004	2.50 ppb
2016-08-17	1608-19347-005	3.60 ppb
2016-08-17	1608-19347-006	2.90 ppb
2016-08-17	1609-19347-007	3.00 ppb
2016-08-17	1609-19347-008	2.90 ppb
2016-11-16	1611480-01	2.50 ppb
2016-11-16	1611480-02	2.10 ppb
2016-11-16	1611480-03	3.20 ppb
2016-11-16	1611480-04	3.70 ppb
2016-11-16	1611480-05	4.60 ppb
2016-11-16	1611480-06	ND
2016-11-16	1611480-07	3.10 ppb
2016-11-16	1611480-08	ND
2017-02-15	1702292-01	ND
2017-02-15	1702292-02	ND
2017-02-15	1702292-03	ND
2017-02-15	1702292-04	ND
2017-02-15	1702292-05	ND
2017-02-15	1702292-06	ND
2017-02-15	1702292-07	ND
2017-02-15	1702292-08	ND
2017-05-16	1705442-01	3.10 ppb
2017-05-16	1705442-02	2.70 ppb
2017-05-16	1705442-03	ND
2017-05-16	1705442-04	ND
2017-05-16	1705442-05	2.10 ppb
2017-05-16	1705442-06	ND
2017-05-16	1705442-07	ND
2017-05-16	1705442-08	ND
2017-08-16	1708376-01	2.50 ppb
2017-08-16	1708376-02	3.10 ppb
2017-08-16	1708376-03	3.80 ppb
2017-08-16	1708376-04	2.40 ppb
2017-08-16	1708376-05	2.90 ppb
2017-08-16	1708376-06	2.90 ppb
2017-08-16	1708376-07	2.20 ppb
2017-08-16	1708376-08	2.70 ppb
2017-11-21	1711626-01A	2.70 ppb
2017-11-21	1711626-02A	2.90 ppb
2017-11-21	1711626-03A	ND
2017-11-21	1711626-04A	3.90 ppb
2017-11-21	1711626-05A	2.70 ppb
2017-11-21	1711626-06A	ND
2017-11-21	1711626-07A	3.10 ppb
2017-11-21	1711626-08A	3.20 ppb
2018-02-20	1802387-01	ND
2018-02-20	1802387-02	2.20 ppb
2018-02-20	1802387-03	2.00 ppb
2018-02-20	1802387-04	2.80 ppb
2018-02-20	1802387-05	ND
2018-02-20	1802387-06	ND
2018-02-20	1802387-07	2.90 ppb
2018-02-20	1802387-08	2.30 ppb
2018-05-16	1805426-01	ND
2018-05-16	1805426-02	ND
2018-05-16	1805426-03	ND
2018-05-16	1805426-04	ND
2018-05-16	1805426-05	ND
2018-05-16	1805426-06	ND
2018-05-16	1805426-07	ND
2018-05-16	1805426-08	ND
2018-08-15	1808405-01	6.80 ppb
2018-08-15	1808405-02	8.70 ppb
2018-08-15	1808405-03	ND
2018-08-15	1808405-04	3.70 ppb
2018-08-15	1808405-05	8.40 ppb
2018-08-15	1808405-06	7.50 ppb
2018-08-15	1808405-07	7.40 ppb
2018-08-15	1808405-08	7.30 ppb
2018-11-20	1811551-01	ND
2018-11-20	1811551-02	ND
2018-11-20	1811551-03	ND
2018-11-20	1811551-04	ND
2018-11-20	1811551-05	ND
2018-11-20	1811551-06	ND
2018-11-20	1811551-07	ND
2018-11-20	1811551-08	ND
2019-02-21	1902421-01	3.00 ppb
2019-02-21	1902421-02	ND
2019-02-21	1902421-03	3.50 ppb
2019-02-21	1902421-04	2.60 ppb
2019-02-21	1902421-05	2.30 ppb
2019-02-21	1902421-06	ND
2019-02-21	1902421-07	4.40 ppb
2019-02-21	1902421-08	ND
2019-05-15	1905513-01	ND
2019-05-15	1905513-02	2.00 ppb
2019-05-15	1905513-03	ND
2019-05-15	1905513-04	ND
2019-05-15	1905513-05	ND
2019-05-15	1905513-06	ND
2019-05-15	1905513-07	ND
2019-05-15	1905513-08	ND
2019-08-21	19H0686-01	2.50 ppb
2019-08-21	19H0686-02	2.00 ppb
2019-08-21	19H0686-03	ND
2019-08-21	19H0686-04	ND
2019-08-21	19H0686-05	2.40 ppb
2019-08-21	19H0686-06	ND
2019-08-21	19H0686-07	ND
2019-08-21	19H0686-08	ND
2019-11-20	19K0605-01	ND
2019-11-20	19K0605-02	ND
2019-11-20	19K0605-03	ND
2019-11-20	19K0605-04	ND
2019-11-20	19K0605-05	ND
2019-11-20	19K0605-06	ND
2019-11-20	19K0605-07	2.40 ppb
2019-11-20	19K0605-08	ND