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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Bi County WSC 1

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

 

90

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.29 ppb107ND - 5.30 ppb
20152.26 ppb167ND - 10.6 ppb
20160.406 ppb162ND - 3.70 ppb
2017ND160ND
20180.500 ppb166ND - 1.60 ppb
20190.375 ppb164ND - 1.70 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
2014-07-14Q1427473019ND
2014-07-14Q1427473018ND
2014-09-19Q14466640032.50 ppb
2014-09-19Q14466640022.70 ppb
2014-09-19Q14466640012.90 ppb
2014-09-19Q14466640045.30 ppb
2014-11-21Q14575580013.60 ppb
2014-11-21Q14575580022.90 ppb
2014-11-21Q14575580033.00 ppb
2014-11-21Q1457558004ND
2015-02-05Q1504623006ND
2015-02-05Q1504623005ND
2015-02-05Q1504623004ND
2015-02-05Q15046230032.10 ppb
2015-04-16Q15144100182.60 ppb
2015-04-16Q1514410021ND
2015-04-16Q1514410020ND
2015-04-16Q1514410019ND
2015-09-04Q1534657001ND
2015-09-04Q1534657002ND
2015-09-04Q1534657004ND
2015-09-04Q153465700310.6 ppb
2015-10-28Q15426840043.80 ppb
2015-10-28Q15426840035.00 ppb
2015-10-28Q15426840024.60 ppb
2015-10-28Q15426840017.50 ppb
2016-01-26Q1603327004ND
2016-01-26Q1603327003ND
2016-01-26Q1603327002ND
2016-01-26Q1603327001ND
2016-04-19Q1615295004ND
2016-04-19Q16152950023.70 ppb
2016-04-19Q1615295003ND
2016-04-19Q16152950052.80 ppb
2016-07-21Q1629732004ND
2016-07-21Q1629732003ND
2016-07-21Q1629732002ND
2016-07-21Q1629732001ND
2016-10-06Q1642553029ND
2016-10-06Q1642553028ND
2016-10-06Q1642553027ND
2016-10-06Q1642553026ND
2017-01-05Q1700559018ND
2017-01-05Q1700559041ND
2017-01-05Q1700559019ND
2017-01-05Q1700559040ND
2017-04-19Q1716423004ND
2017-04-19Q1716423003ND
2017-04-19Q1716423002ND
2017-04-19Q1716423001ND
2017-07-20Q1729905002ND
2017-07-20Q1729905003ND
2017-07-20Q1729905001ND
2017-07-20Q1729905004ND
2017-10-02Q1748547004ND
2017-10-02Q1748547003ND
2017-10-02Q1748547005ND
2017-10-02Q1748547006ND
2018-01-09Q1800903053ND
2018-01-09Q1800903052ND
2018-01-09Q1800903051ND
2018-01-09Q1800903050ND
2018-05-21Q1820414003ND
2018-05-21Q1820414001ND
2018-05-21Q1820414002ND
2018-05-21Q1820414004ND
2018-09-10Q1835620005ND
2018-09-10Q18356200021.60 ppb
2018-09-10Q18356200031.60 ppb
2018-09-10Q18356200041.000 ppb
2018-10-22Q1841923004ND
2018-10-22Q18419230031.10 ppb
2018-10-22Q18419230021.30 ppb
2018-10-22Q18419230011.40 ppb
2019-01-15Q19020830331.50 ppb
2019-01-15Q19020830341.40 ppb
2019-01-15Q19020830351.40 ppb
2019-01-15Q1902083036ND
2019-04-18Q1915824002ND
2019-04-18Q1915824004ND
2019-04-18Q1915824001ND
2019-04-18Q1915824003ND
2019-08-07Q1951925005ND
2019-08-07Q1951925004ND
2019-08-07Q1951925003ND
2019-08-07Q1951925002ND
2019-10-14Q19724040041.70 ppb
2019-10-14Q1972404005ND
2019-10-14Q1972404006ND
2019-10-14Q1972404003ND