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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Ottawa

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
20142.28 ppb1610ND - 5.80 ppb
20153.91 ppb16162.40 ppb - 14.0 ppb
20161.68 ppb1610ND - 3.80 ppb
20171.76 ppb1610ND - 3.60 ppb
20181.26 ppb169ND - 2.60 ppb
20193.16 ppb1614ND - 5.60 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
2014-02-1160182ND
2014-02-1160178ND
2014-02-1160174ND
2014-02-1160172ND
2014-05-061106353.00 ppb
2014-05-061106343.70 ppb
2014-05-061106333.50 ppb
2014-05-061106323.40 ppb
2014-08-111716173.00 ppb
2014-08-111716163.30 ppb
2014-08-11171618ND
2014-08-11171619ND
2014-11-102298192.80 ppb
2014-11-102298175.10 ppb
2014-11-102298142.90 ppb
2014-11-102298115.80 ppb
2015-02-112773752.60 ppb
2015-02-112773742.60 ppb
2015-02-112773732.60 ppb
2015-02-112773722.60 ppb
2015-05-123319622.60 ppb
2015-05-123319633.00 ppb
2015-05-123319652.80 ppb
2015-05-123319643.20 ppb
2015-08-1038067914.0 ppb
2015-08-103806787.50 ppb
2015-08-103806773.70 ppb
2015-08-103806765.10 ppb
2015-11-044279202.60 ppb
2015-11-044279192.40 ppb
2015-11-044279182.60 ppb
2015-11-044279172.60 ppb
2016-02-16493394ND
2016-02-16493393ND
2016-02-16493395ND
2016-02-164933962.10 ppb
2016-05-24550888ND
2016-05-245508872.30 ppb
2016-05-245508862.10 ppb
2016-05-245508852.20 ppb
2016-08-236075253.60 ppb
2016-08-236075243.70 ppb
2016-08-236075233.80 ppb
2016-08-236075222.80 ppb
2016-11-14658851ND
2016-11-14658854ND
2016-11-146588532.10 ppb
2016-11-146588522.10 ppb
2017-02-137077822.30 ppb
2017-02-13707781ND
2017-02-13707780ND
2017-02-137077792.20 ppb
2017-05-177623093.30 ppb
2017-05-177623083.00 ppb
2017-05-177623073.60 ppb
2017-05-177623063.10 ppb
2017-08-21822372ND
2017-08-21822371ND
2017-08-21822373ND
2017-08-21822374ND
2017-11-148776602.30 ppb
2017-11-148776592.70 ppb
2017-11-148776582.40 ppb
2017-11-148776573.20 ppb
2018-02-149074122.30 ppb
2018-02-149074112.00 ppb
2018-02-149074092.10 ppb
2018-02-149074082.20 ppb
2018-05-239742672.20 ppb
2018-05-239742682.20 ppb
2018-05-239742702.60 ppb
2018-05-239742692.40 ppb
2018-08-221029456ND
2018-08-221029455ND
2018-08-221029454ND
2018-08-221029453ND
2018-11-271081170ND
2018-11-271081169ND
2018-11-2710811682.20 ppb
2018-11-271081167ND
2019-02-121119812ND
2019-02-1211198103.00 ppb
2019-02-1211198142.00 ppb
2019-02-121119816ND
2019-05-2011574653.70 ppb
2019-05-2011574642.80 ppb
2019-05-2011574633.10 ppb
2019-05-2011574623.20 ppb
2019-08-2812298073.40 ppb
2019-08-2812298063.60 ppb
2019-08-2812298053.60 ppb
2019-08-2812298043.70 ppb
2019-11-2012776093.30 ppb
2019-11-2012776124.60 ppb
2019-11-2012776115.60 ppb
2019-11-2012776104.90 ppb