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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Tri-water System

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

 

76

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND80ND
2016ND160ND
20171.20 ppb162ND - 9.60 ppb
20183.13 ppb164ND - 14.0 ppb
2019ND160ND

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
2014-08-191327972ND
2014-08-191327971ND
2014-08-191327972ND
2014-08-191327971ND
2015-08-251422220ND
2015-08-251422221ND
2015-08-251422221ND
2015-08-251422220ND
2015-11-181445101ND
2015-11-181445102ND
2015-11-181445102ND
2015-11-181445101ND
2016-02-171468281ND
2016-02-171468282ND
2016-02-171468282ND
2016-02-171468281ND
2016-05-251494224ND
2016-05-251494225ND
2016-05-251494225ND
2016-05-251494224ND
2016-08-151516440ND
2016-08-151516441ND
2016-08-151516441ND
2016-08-151516440ND
2016-11-081539769ND
2016-11-081539769ND
2016-11-091539770ND
2016-11-091539770ND
2017-02-0235292874006ND
2017-02-0235292874005ND
2017-02-0235292874005ND
2017-02-0235292874006ND
2017-05-1535312642008ND
2017-05-1535312642007ND
2017-05-1535312642007ND
2017-05-1535312642008ND
2017-08-10353298050079.60 ppb
2017-08-1035329805008ND
2017-08-1035329805008ND
2017-08-10353298050079.60 ppb
2017-11-2735350755002ND
2017-11-2735350755001ND
2017-11-2735350755001ND
2017-11-2735350755002ND
2018-02-2635376601001ND
2018-02-2635376601002ND
2018-02-2635376601001ND
2018-02-2635376601002ND
2018-05-2935395208001ND
2018-05-2935395208002ND
2018-05-2935395208001ND
2018-05-2935395208002ND
2018-08-163541206400114.0 ppb
2018-08-163541206400211.0 ppb
2018-08-163541206400114.0 ppb
2018-08-163541206400211.0 ppb
2018-11-1935432392001ND
2018-11-1935432392002ND
2018-11-1935432392001ND
2018-11-1935432392002ND
2019-02-2535450960002ND
2019-02-2535450960001ND
2019-02-2535450960001ND
2019-02-2535450960002ND
2019-05-2035470221002ND
2019-05-2035470221002ND
2019-05-2035470221001ND
2019-05-2035470221001ND
2019-08-1935492405002ND
2019-08-1935492405001ND
2019-08-1935492405001ND
2019-08-1935492405002ND
2019-11-1935514077001ND
2019-11-1935514077002ND
2019-11-1935514077001ND
2019-11-1935514077002ND