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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

University 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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.750 ppb164ND - 3.00 ppb
20150.688 ppb164ND - 3.00 ppb
20160.563 ppb164ND - 3.00 ppb
20171.06 ppb164ND - 5.00 ppb
20181.19 ppb167ND - 3.00 ppb
2019ND160ND

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
2014-01-282031245ND
2014-01-282031246ND
2014-01-302031242ND
2014-01-302031247ND
2014-04-292049977ND
2014-04-302049978ND
2014-04-302049979ND
2014-04-302049976ND
2014-07-2820674363.00 ppb
2014-07-2820710223.00 ppb
2014-07-302067455ND
2014-07-3020710213.00 ppb
2014-10-302090631ND
2014-10-3020906403.00 ppb
2014-10-302090632ND
2014-10-302090630ND
2015-01-29OE212136ND
2015-01-29OE212137ND
2015-01-29OE212138ND
2015-01-29OE212139ND
2015-04-27OE235896ND
2015-04-27OE235897ND
2015-04-27OE235898ND
2015-04-27OE235899ND
2015-07-30OE2736323.00 ppb
2015-07-30OE2736333.00 ppb
2015-07-30OE2736313.00 ppb
2015-07-30OE273630ND
2015-10-29OE313413ND
2015-10-29OE3134112.00 ppb
2015-10-29OE313412ND
2015-10-29OE313414ND
2016-01-29OE340605ND
2016-01-29OE340606ND
2016-01-29OE340607ND
2016-01-29OE340608ND
2016-04-29OE372770ND
2016-04-29OE372771ND
2016-04-29OE372769ND
2016-04-29OE372768ND
2016-07-29OE407869ND
2016-07-29OE407870ND
2016-07-29OE407868ND
2016-07-29OE407867ND
2016-10-31OE4467882.00 ppb
2016-10-31OE4467892.00 ppb
2016-10-31OE4467902.00 ppb
2016-10-31OE4467873.00 ppb
2017-01-30OE4751975.00 ppb
2017-01-30OE4751954.00 ppb
2017-01-30OE4751984.00 ppb
2017-01-30OE4751964.00 ppb
2017-04-19OE504071ND
2017-04-19OE504072ND
2017-04-19OE504073ND
2017-04-19OE504074ND
2017-07-19OE539583ND
2017-07-19OE539580ND
2017-07-19OE539581ND
2017-07-19OE539582ND
2017-10-30OE583917ND
2017-10-30OE583915ND
2017-10-30OE583916ND
2017-10-30OE583918ND
2018-01-29OE616141ND
2018-01-29OE616140ND
2018-01-29OE616139ND
2018-01-29OE616138ND
2018-04-27OE650761ND
2018-04-27OE650758ND
2018-04-27OE650759ND
2018-04-27OE650760ND
2018-07-31OE6916343.00 ppb
2018-07-31OE691633ND
2018-07-31OE6916323.00 ppb
2018-07-31OE6916313.00 ppb
2018-10-30OE7334953.00 ppb
2018-10-30OE7334962.00 ppb
2018-10-30OE7334972.00 ppb
2018-10-30OE7334983.00 ppb
2019-01-28OE765066ND
2019-01-28OE765067ND
2019-01-28OE765068ND
2019-01-28OE765069ND
2019-04-23OE798551ND
2019-04-23OE798554ND
2019-04-23OE798553ND
2019-04-23OE798552ND
2019-07-26OE840773ND
2019-07-26OE840775ND
2019-07-26OE840774ND
2019-07-26OE840772ND
2019-10-30OE886957ND
2019-10-30OE886956ND
2019-10-30OE886955ND
2019-10-30OE886954ND