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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

St. Marys

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
2014ND160ND
20150.338 ppb161ND - 5.40 ppb
2016ND160ND
2017ND160ND
2018ND160ND
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
2014-02-20AI28415ND
2014-02-20AI28414ND
2014-02-20AI28413ND
2014-02-20AI28412ND
2014-05-21AI41180ND
2014-05-21AI41179ND
2014-05-21AI41178ND
2014-05-21AI41177ND
2014-08-20AI50650ND
2014-08-20AI50649ND
2014-08-20AI50651ND
2014-08-20AI50652ND
2014-11-19AI59884ND
2014-11-19AI59883ND
2014-11-19AI59882ND
2014-11-19AI59881ND
2015-02-18AI65165ND
2015-02-18AI65164ND
2015-02-18AI65163ND
2015-02-18AI65162ND
2015-05-19AI77530ND
2015-05-19AI77531ND
2015-05-19AI77533ND
2015-05-19AI77532ND
2015-08-19AI87082ND
2015-08-19AI87081ND
2015-08-19AI870805.40 ppb
2015-08-19AI87079ND
2015-11-23AJ01574ND
2015-11-23AJ01573ND
2015-11-23AJ01572ND
2015-11-23AJ01571ND
2016-02-18AJ06755ND
2016-02-18AJ06754ND
2016-02-18AJ06756ND
2016-02-18AJ06757ND
2016-05-24AJ12806ND
2016-05-24AJ12805ND
2016-05-24AJ12804ND
2016-05-24AJ12803ND
2016-08-16AJ22876ND
2016-08-16AJ22875ND
2016-08-16AJ22874ND
2016-08-16AJ22873ND
2016-11-21AJ33967ND
2016-11-21AJ33970ND
2016-11-21AJ33969ND
2016-11-21AJ33968ND
2017-02-22AJ46978ND
2017-02-22AJ46977ND
2017-02-22AJ46976ND
2017-02-22AJ46975ND
2017-05-31AJ56314ND
2017-05-31AJ56313ND
2017-05-31AJ56312ND
2017-05-31AJ56311ND
2017-08-16AJ64606ND
2017-08-16AJ64605ND
2017-08-16AJ64607ND
2017-08-16AJ64608ND
2017-11-20AJ74073ND
2017-11-20AJ74072ND
2017-11-20AJ74071ND
2017-11-20AJ74070ND
2018-02-22AJ84454ND
2018-02-22AJ84453ND
2018-02-22AJ84452ND
2018-02-22AJ84451ND
2018-06-13AJ91529ND
2018-06-13AJ91530ND
2018-06-13AJ91532ND
2018-06-13AJ91531ND
2018-08-15AJ97954ND
2018-08-15AJ97953ND
2018-08-15AJ97952ND
2018-08-15AJ97951ND
2018-11-15AK06238ND
2018-11-15AK06237ND
2018-11-15AK06236ND
2018-11-15AK06235ND
2019-02-19AK11581ND
2019-02-19AK11580ND
2019-02-19AK11582ND
2019-02-19AK11583ND
2019-05-14AK17432ND
2019-05-14AK17431ND
2019-05-14AK17430ND
2019-05-14AK17429ND
2019-08-20AK26987ND
2019-08-20AK26986ND
2019-08-20AK26985ND
2019-08-20AK26984ND
2019-11-19AK37087ND
2019-11-19AK37090ND
2019-11-19AK37089ND
2019-11-19AK37088ND