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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

National Park Water Department

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

 

52

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND80ND
2016ND80ND
2017ND80ND
2018ND120ND
20192.61 ppb82ND - 13.4 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
2014-01-24L4906385-2ND
2014-01-24L4906385-1ND
2014-04-15L4982742-1ND
2014-04-15L4982742-2ND
2014-07-14L5122666-2ND
2014-07-14L5122666-1ND
2014-11-17L5255666-2ND
2014-11-17L5255666-1ND
2015-01-15L5372127-1ND
2015-01-15L5372127-2ND
2015-04-21L5506269-2ND
2015-04-21L5506269-1ND
2015-07-14L5666240-2ND
2015-07-14L5666240-1ND
2015-10-12L5827794-2ND
2015-10-12L5827794-1ND
2016-01-11L5974043-2ND
2016-01-11L5974043-1ND
2016-04-143431764ND
2016-04-143431763ND
2016-07-153494583ND
2016-07-153494582ND
2016-10-103562245ND
2016-10-103562244ND
2017-01-103618771ND
2017-01-103618772ND
2017-04-113675217ND
2017-04-113675218ND
2017-07-123733121ND
2017-07-123733122ND
2017-10-133801338ND
2017-10-133801339ND
2018-01-092287980001ND
2018-01-092287980002ND
2018-01-113851889ND
2018-01-113851890ND
2018-04-092308057001ND
2018-04-092308057002ND
2018-04-133914855ND
2018-04-133914854ND
2018-07-092325720001ND
2018-07-092325720002ND
2018-10-082343183001ND
2018-10-082343183002ND
2019-01-083010048001ND
2019-01-083010046001ND
2019-04-053026945002ND
2019-04-053026945001ND
2019-07-083044131001ND
2019-07-083044131002ND
2019-10-08306263600113.4 ppb
2019-10-0830626360027.50 ppb