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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Portland

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

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015ND60ND
2016ND80ND
20170.550 ppb82ND - 2.30 ppb
20180.233 ppb91ND - 2.10 ppb
2019ND80ND

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
2014-06-0314157000601ND
2014-06-0314157003701ND
2014-08-2014233012401ND
2014-08-2014233012501ND
2014-10-2714303004001ND
2014-10-2714303004101ND
2015-04-2815120013101ND
2015-04-2815120013001ND
2015-07-2815211003601ND
2015-08-1715232004301ND
2015-10-2715301002201ND
2015-10-2715301002101ND
2016-01-2616028004101ND
2016-01-2616028004201ND
2016-04-2616119005401ND
2016-04-2616119005301ND
2016-07-1216196012701ND
2016-07-1216196012201ND
2016-10-1116287000801ND
2016-10-1116287000901ND
2017-01-1017012005101ND
2017-01-1017012005201ND
2017-04-1017102001601ND
2017-04-1017102001501ND
2017-07-10171930010012.10 ppb
2017-07-10171930009012.30 ppb
2017-10-0917285002301ND
2017-10-0917285002401ND
2018-01-0918010001502ND
2018-01-0918010001402ND
2018-04-1018102002601ND
2018-04-1018102002501ND
2018-07-0918193007501ND
2018-07-0918193007601ND
2018-10-0918284001001ND
2018-10-0918284001101ND
2018-10-22182980007012.10 ppb
2019-01-1419017001901ND
2019-01-1419017002001ND
2019-04-0819101003401ND
2019-04-0819101003301ND
2019-08-0619220014901ND
2019-08-0619220015001ND
2019-10-0719283004401ND
2019-10-0719283004301ND