Monochloroacetic acid

Maine Water Company Camden & Rockland

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
2013	N/A	0	0	N/A
2014	N/A	0	0	N/A
2015	0.783 ppb	18	3	ND - 9.90 ppb
2016	0.489 ppb	19	3	ND - 3.80 ppb
2017	0.345 ppb	20	2	ND - 4.80 ppb
2018	0.960 ppb	20	6	ND - 4.70 ppb
2019	0.425 ppb	20	3	ND - 3.50 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
2015-02-18	K005050001	ND
2015-02-18	K005051001	ND
2015-02-18	K005058001	2.20 ppb
2015-02-18	K005053001	ND
2015-02-18	K005052001	ND
2015-05-19	K005049001	ND
2015-05-19	K005059001	ND
2015-05-19	K005057001	ND
2015-08-19	K032558001	ND
2015-08-19	K032556001	ND
2015-08-19	K032554001	ND
2015-08-19	K032552001	ND
2015-08-19	K032551001	ND
2015-11-18	K045660001	2.00 ppb
2015-11-18	K045661001	ND
2015-11-18	K045658001	ND
2015-11-18	K045659001	ND
2015-11-18	K045657001	9.90 ppb
2016-02-19	L003592001	ND
2016-02-19	L003593001	ND
2016-02-19	L003594001	ND
2016-02-19	L003595001	ND
2016-02-19	L003596001	ND
2016-05-18	L016438001	3.80 ppb
2016-05-18	L016441001	ND
2016-05-18	L016440001	2.80 ppb
2016-05-18	L016439001	2.70 ppb
2016-08-17	L031717001	ND
2016-08-17	L031716001	ND
2016-08-17	L031715001	ND
2016-08-17	L031714001	ND
2016-08-17	L031713001	ND
2016-11-16	L046116001	ND
2016-11-16	L046115001	ND
2016-11-16	L046117001	ND
2016-11-16	L046118001	ND
2016-11-16	L046114001	ND
2017-02-15	M004070001	ND
2017-02-15	M004071001	ND
2017-02-15	M004069001	ND
2017-02-15	M004068001	4.80 ppb
2017-02-15	M004067001	ND
2017-05-16	1705527-01	ND
2017-05-16	1705528-01	2.10 ppb
2017-05-16	1705529-01	ND
2017-05-16	1705530-01	ND
2017-05-16	1705531-01	ND
2017-08-16	1712640-01	ND
2017-08-16	1712643-01	ND
2017-08-16	1712641-01	ND
2017-08-16	1712644-01	ND
2017-08-16	1712642-01	ND
2017-11-17	1718269-01	ND
2017-11-17	1718270-01	ND
2017-11-17	1718271-01	ND
2017-11-17	1718272-01	ND
2017-11-17	1718273-01	ND
2018-02-22	1802237-01	ND
2018-02-22	1802238-01	4.70 ppb
2018-02-22	1802240-01	3.30 ppb
2018-02-22	1802239-01	3.30 ppb
2018-02-23	1802241-01	3.80 ppb
2018-05-16	1808556-01	ND
2018-05-16	1808558-01	ND
2018-05-16	1808559-01	ND
2018-05-16	1808560-01	ND
2018-05-16	1808557-01	ND
2018-08-15	1815827-01	ND
2018-08-15	1815831-01	ND
2018-08-15	1815829-01	ND
2018-08-15	1815830-01	ND
2018-08-16	1815828-01	ND
2018-11-14	1822005-01	ND
2018-11-14	1822003-01	ND
2018-11-14	1822001-01	ND
2018-11-14	1822004-01	2.10 ppb
2018-11-14	1822002-01	2.00 ppb
2019-02-27	1902121-01	ND
2019-02-27	1902120-01	ND
2019-02-27	1902119-01	ND
2019-02-27	1902118-01	ND
2019-02-27	1902117-01	ND
2019-05-21	1907984-01	ND
2019-05-21	1907987-01	ND
2019-05-21	1907988-01	ND
2019-05-21	1907986-01	ND
2019-05-21	1907985-01	ND
2019-08-21	1914824-01	3.00 ppb
2019-08-21	1914821-01	ND
2019-08-21	1914823-01	ND
2019-08-21	1914825-01	ND
2019-08-21	1914822-01	3.50 ppb
2019-11-13	1920756-01	ND
2019-11-13	1920754-01	ND
2019-11-13	1920753-01	ND
2019-11-13	1920752-01	ND
2019-11-13	1920755-01	2.00 ppb