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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Bethesda WSC

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
2013N/A00N/A
20141.63 ppb169ND - 3.60 ppb
20151.56 ppb166ND - 5.90 ppb
20161.31 ppb165ND - 5.40 ppb
2017ND160ND
20181.16 ppb1611ND - 3.50 ppb
20190.669 ppb165ND - 2.50 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
2014-03-20Q14091140042.40 ppb
2014-03-20Q14091140033.00 ppb
2014-03-20Q14091140022.70 ppb
2014-03-20Q14091140012.90 ppb
2014-06-13Q1421328001ND
2014-06-13Q1421328014ND
2014-06-13Q1421328013ND
2014-06-13Q1421328012ND
2014-09-08Q1441954004ND
2014-09-08Q14419540033.00 ppb
2014-09-08Q1441954001ND
2014-09-08Q1441954002ND
2014-11-19Q14567300082.80 ppb
2014-11-19Q14567300072.10 ppb
2014-11-19Q14567300063.60 ppb
2014-11-19Q14567300053.60 ppb
2015-02-03Q1504044005ND
2015-02-03Q15040440082.90 ppb
2015-02-03Q1504044007ND
2015-02-03Q1504044006ND
2015-04-22Q15150390214.30 ppb
2015-04-22Q15150390223.90 ppb
2015-04-22Q15150390243.90 ppb
2015-04-22Q15150390234.00 ppb
2015-08-04Q1530233010ND
2015-08-04Q1530233009ND
2015-08-04Q1530233008ND
2015-08-04Q1530233007ND
2015-11-02Q1543432004ND
2015-11-02Q1543432003ND
2015-11-02Q15434320025.90 ppb
2015-11-02Q1543432001ND
2016-02-17Q1607184009ND
2016-02-17Q1607184008ND
2016-02-17Q1607184010ND
2016-02-17Q1607184011ND
2016-04-20Q1615721017ND
2016-04-20Q16157210163.60 ppb
2016-04-20Q1615721015ND
2016-04-20Q1615721014ND
2016-09-06Q1635394004ND
2016-09-06Q1635394003ND
2016-09-06Q1635394002ND
2016-09-06Q1635394001ND
2016-11-08Q16482130185.10 ppb
2016-11-08Q16482130213.60 ppb
2016-11-08Q16482130205.40 ppb
2016-11-08Q16482130193.30 ppb
2017-01-31Q1704122024ND
2017-01-31Q1704122011ND
2017-01-31Q1704122010ND
2017-01-31Q1704122009ND
2017-04-18Q1715805005ND
2017-04-18Q1715805004ND
2017-04-18Q1715805003ND
2017-04-18Q1715805002ND
2017-07-18Q1729512003ND
2017-07-18Q1729512002ND
2017-07-18Q1729512004ND
2017-07-18Q1729512005ND
2017-10-17Q1753293006ND
2017-10-17Q1753293023ND
2017-10-17Q1753293028ND
2017-10-17Q1753293032ND
2018-02-21Q1807322008ND
2018-02-21Q1807322002ND
2018-02-21Q1807322007ND
2018-02-21Q1807322006ND
2018-05-16Q18199570362.00 ppb
2018-05-16Q18199570371.40 ppb
2018-05-16Q18199570391.40 ppb
2018-05-16Q18199570383.50 ppb
2018-07-25Q18296070051.20 ppb
2018-07-25Q18296070041.20 ppb
2018-07-25Q1829607003ND
2018-07-25Q18296070022.10 ppb
2018-10-19Q18420520121.50 ppb
2018-10-19Q18420520111.30 ppb
2018-10-19Q18420520101.40 ppb
2018-10-19Q18420520091.60 ppb
2019-01-15Q19019900142.50 ppb
2019-01-15Q19019900132.40 ppb
2019-01-15Q19019900152.50 ppb
2019-01-15Q19019900162.20 ppb
2019-04-11Q1914886033ND
2019-04-11Q1914886032ND
2019-04-11Q1914886031ND
2019-04-11Q19148860301.10 ppb
2019-08-06Q1951620005ND
2019-08-06Q1951620004ND
2019-08-06Q1951620003ND
2019-08-06Q1951620002ND
2019-10-07Q1971784003ND
2019-10-07Q1971784006ND
2019-10-07Q1971784005ND
2019-10-07Q1971784004ND