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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

San Dieguito WD

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

 

88

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
2014ND160ND
2015ND160ND
2016ND80ND
20170.150 ppb161ND - 2.40 ppb
20180.275 ppb162ND - 2.30 ppb
20190.156 ppb161ND - 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
2014-02-119590-902-1018ND
2014-02-119590-900-1004ND
2014-02-119590-901-0946ND
2014-02-119590-903-0928ND
2014-05-149590-903-0953ND
2014-05-149590-902-0901ND
2014-05-149590-901-0934ND
2014-05-149590-900-0840ND
2014-08-129590-903-0920ND
2014-08-129590-902-1018ND
2014-08-129590-901-0937ND
2014-08-129590-900-1002ND
2014-11-109590-902-1200ND
2014-11-109590-901-1000ND
2014-11-109590-903-0949ND
2014-11-109590-900-1038ND
2015-02-109590-902-0952ND
2015-02-109590-903-0857ND
2015-02-109590-901-0919ND
2015-02-109590-900-0935ND
2015-05-129590-903-0927ND
2015-05-129590-902-1031ND
2015-05-129590-900-1007ND
2015-05-129590-901-0944ND
2015-08-119590-900-0810ND
2015-08-119590-903-0755ND
2015-08-119590-901-0819ND
2015-08-119590-902-0935ND
2015-11-169590-900-0901ND
2015-11-169590-903-0805ND
2015-11-169590-901-0827ND
2015-11-169590-902-0922ND
2016-08-169590-900-0753ND
2016-08-169590-903-0733ND
2016-08-169590-901-0719ND
2016-08-169590-902-0809ND
2016-11-159590-901-0820ND
2016-11-159590-900-0842ND
2016-11-159590-903-0801ND
2016-11-159590-902-1005ND
2017-02-019590-903-0710ND
2017-02-019590-902-0805ND
2017-02-019590-900-0748ND
2017-02-019590-901-0728ND
2017-05-099590-902-1018ND
2017-05-099590-903-0900ND
2017-05-099590-900-09512.40 ppb
2017-05-099590-901-0922ND
2017-08-089590-902-0950ND
2017-08-089590-900-0932ND
2017-08-089590-901-0917ND
2017-08-089590-903-0900ND
2017-11-149590-900-0922ND
2017-11-149590-903-0846ND
2017-11-149590-901-0900ND
2017-11-149590-902-1019ND
2018-02-139590-900-0752ND
2018-02-139590-903-0717ND
2018-02-139590-901-0733ND
2018-02-139590-902-0809ND
2018-05-169590-900-08002.10 ppb
2018-05-169590-901-0741ND
2018-05-169590-903-07182.30 ppb
2018-05-169590-902-0813ND
2018-08-219590-901-0747ND
2018-08-219590-900-0811ND
2018-08-219590-903-0733ND
2018-08-219590-902-0830ND
2018-11-069590-902-0830ND
2018-11-069590-900-0813ND
2018-11-069590-903-0734ND
2018-11-069590-901-0739ND
2019-02-129590-903-07212.50 ppb
2019-02-129590-901-0737ND
2019-02-129590-900-0758ND
2019-02-129590-902-0826ND
2019-05-159590-903-0748ND
2019-05-159590-900-0824ND
2019-05-159590-902-0840ND
2019-05-159590-901-0808ND
2019-08-139590-900-0926ND
2019-08-139590-903-0851ND
2019-08-139590-902-1036ND
2019-08-139590-901-0906ND
2019-11-139590-900-0850ND
2019-11-139590-903-0740ND
2019-11-139590-902-0828ND
2019-11-139590-901-0757ND