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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Ward Waterworks

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

 

49

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.350 ppb61ND - 2.10 ppb
2015ND40ND
20161.15 ppb21ND - 2.30 ppb
20170.725 ppb124ND - 2.30 ppb
20180.918 ppb114ND - 2.70 ppb
20191.11 ppb146ND - 3.20 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
2014-06-3014184000701ND
2014-06-3014184000801ND
2014-09-15142610040012.10 ppb
2014-09-1514261003901ND
2014-10-0714282002201ND
2014-10-0714282001901ND
2015-01-0515008013801ND
2015-01-0515008013901ND
2015-07-0815190001801ND
2015-11-0215307000901ND
2016-07-2016203002601ND
2016-10-04162790013012.30 ppb
2017-04-0417095002101ND
2017-04-0417095002001ND
2017-04-0417095001901ND
2017-04-0417095002201ND
2017-07-04171870054012.30 ppb
2017-07-04171870053012.00 ppb
2017-07-04171870056012.30 ppb
2017-07-04171870055012.10 ppb
2017-10-0217278004501ND
2017-10-0217278004301ND
2017-10-0217278004601ND
2017-10-0217278004401ND
2018-01-0318004011001ND
2018-01-0318004010901ND
2018-01-0318004011201ND
2018-01-0318004011101ND
2018-05-1518137002501ND
2018-05-16181370026012.70 ppb
2018-05-1618137002401ND
2018-07-04181860152012.60 ppb
2018-07-04181860153012.60 ppb
2018-10-0118277000401ND
2018-10-01182770003012.20 ppb
2019-01-03190040011012.60 ppb
2019-01-03190040012012.30 ppb
2019-04-0319093003501ND
2019-04-0319093003601ND
2019-04-0319093003701ND
2019-04-0319093003401ND
2019-07-0819192012701ND
2019-07-08191920126012.10 ppb
2019-07-0819192012301ND
2019-08-2119234001001ND
2019-10-03192770067013.20 ppb
2019-10-03192770066012.40 ppb
2019-10-03192770064012.90 ppb
2019-10-0319277006501ND