Monochloroacetic acid

Lincoln Water Commission

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

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	0.475 ppb	8	2	ND - 2.20 ppb
2015	0.300 ppb	16	3	ND - 2.10 ppb
2016	0.919 ppb	16	6	ND - 3.70 ppb
2017	0.288 ppb	16	3	ND - 2.00 ppb
2018	0.819 ppb	16	9	ND - 2.00 ppb
2019	0.225 ppb	12	2	ND - 1.60 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
2014-08-14	1408-18101-004	ND
2014-08-14	1408-18101-003	ND
2014-08-14	1408-18101-002	2.20 ppb
2014-08-14	1408-18101-001	ND
2014-11-18	1411-25898-004	ND
2014-11-18	1411-25898-003	ND
2014-11-18	1411-25898-002	1.60 ppb
2014-11-18	1411-25898-001	ND
2015-02-18	1502-03327-002	1.40 ppb
2015-02-18	1502-03327-001	ND
2015-02-18	1502-03327-003	ND
2015-02-18	1502-03327-004	ND
2015-05-20	1505-10232-004	ND
2015-05-20	1505-10232-003	1.30 ppb
2015-05-20	1505-10232-002	2.10 ppb
2015-05-20	1505-10232-001	ND
2015-08-19	1508-17645-004	ND
2015-08-19	1508-17645-003	ND
2015-08-19	1508-17645-002	ND
2015-08-19	1508-17645-001	ND
2015-11-18	1511-25131-004	ND
2015-11-18	1511-25131-001	ND
2015-11-18	1511-25131-002	ND
2015-11-18	1511-25131-003	ND
2016-02-17	1602-03627-004	ND
2016-02-17	1602-03627-003	ND
2016-02-17	1602-03627-002	ND
2016-02-17	1602-03627-001	ND
2016-05-18	1605-11340-001	1.20 ppb
2016-05-18	1605-11340-002	1.30 ppb
2016-05-18	1605-11340-003	ND
2016-05-18	1605-11340-004	ND
2016-08-17	1608-19350-004	2.20 ppb
2016-08-17	1608-19350-003	2.80 ppb
2016-08-17	1608-19350-002	3.70 ppb
2016-08-17	1608-19350-001	3.50 ppb
2016-11-15	1611-26802-004	ND
2016-11-15	1611-26802-003	ND
2016-11-15	1611-26802-002	ND
2016-11-15	1611-26802-001	ND
2017-02-16	1702-03325-004	ND
2017-02-16	1702-03325-003	ND
2017-02-16	1702-03325-002	ND
2017-02-16	1702-03325-001	ND
2017-05-17	1705-10340-004	1.000 ppb
2017-05-17	1705-10340-003	ND
2017-05-17	1705-10340-002	2.00 ppb
2017-05-17	1705-10340-001	ND
2017-08-16	1708-17659-001	ND
2017-08-16	1708-17659-002	1.60 ppb
2017-08-16	1708-17659-003	ND
2017-08-16	1708-17659-004	ND
2017-11-15	1711-24880-004	ND
2017-11-15	1711-24880-003	ND
2017-11-15	1711-24880-002	ND
2017-11-15	1711-24880-001	ND
2018-02-15	1802-03385-004	1.20 ppb
2018-02-15	1802-03385-003	1.000 ppb
2018-02-15	1802-03385-002	ND
2018-02-15	1802-03385-001	1.20 ppb
2018-05-16	1805-10249-002	ND
2018-05-16	1805-10249-001	ND
2018-05-16	1805-10249-003	ND
2018-05-16	1805-10249-004	ND
2018-08-16	1808-17515-004	ND
2018-08-16	1808-17515-003	1.40 ppb
2018-08-16	1808-17515-002	2.00 ppb
2018-08-16	1808-17515-001	1.80 ppb
2018-11-14	1811-24373-001	1.60 ppb
2018-11-14	1811-24373-002	1.60 ppb
2018-11-14	1811-24373-003	ND
2018-11-14	1811-24373-004	1.30 ppb
2019-02-13	1902-02802-004	ND
2019-02-13	1902-02802-003	ND
2019-02-13	1902-02802-002	1.10 ppb
2019-02-13	1902-02802-001	ND
2019-06-21	1906-11551-004	ND
2019-06-21	1906-11551-003	ND
2019-06-21	1906-11551-002	1.60 ppb
2019-06-21	1906-11551-001	ND
2019-11-13	1911-21152-002	ND
2019-11-13	1911-21152-003	ND
2019-11-13	1911-21152-004	ND
2019-11-13	1911-21152-001	ND