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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Mount Ayr Water Treatment Plant

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

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
20151.25 ppb84ND - 3.00 ppb
20160.875 ppb82ND - 4.00 ppb
20170.875 ppb82ND - 4.00 ppb
2018ND80ND
20190.250 ppb81ND - 2.00 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
2014-01-162030437ND
2014-01-162030438ND
2014-04-012043700ND
2014-04-012043701ND
2014-07-072063768ND
2014-07-072063766ND
2014-10-132086441ND
2014-10-132086434ND
2015-01-15OE210382ND
2015-01-15OE210383ND
2015-04-13OE230829ND
2015-04-13OE230828ND
2015-07-06OE2637522.00 ppb
2015-07-06OE2637512.00 ppb
2015-10-06OE3029623.00 ppb
2015-10-06OE3029613.00 ppb
2016-01-11OE334369ND
2016-01-11OE334370ND
2016-04-11OE364804ND
2016-04-11OE364805ND
2016-07-11OE399641ND
2016-07-11OE399640ND
2016-10-03OE4362333.00 ppb
2016-10-03OE4362344.00 ppb
2017-01-09OE468944ND
2017-01-09OE468943ND
2017-04-03OE498091ND
2017-04-03OE498090ND
2017-07-05OE533197ND
2017-07-05OE533196ND
2017-10-09OE5760233.00 ppb
2017-10-09OE5760244.00 ppb
2018-01-08OE608705ND
2018-01-08OE608704ND
2018-04-16OE646180ND
2018-04-16OE646181ND
2018-07-16OE684544ND
2018-07-16OE684545ND
2018-10-23OE731167ND
2018-10-23OE731168ND
2019-01-14OE760463ND
2019-01-14OE760464ND
2019-04-09OE792428ND
2019-04-09OE792429ND
2019-07-08OE831497ND
2019-07-08OE8314982.00 ppb
2019-10-01OE873831ND
2019-10-01OE873830ND