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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Lahaina

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

 

84

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
2014N/A00N/A
2015ND240ND
2016ND120ND
2017ND160ND
20180.181 ppb161ND - 2.90 ppb
20190.331 ppb162ND - 2.70 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
2015-01-14201501160204ND
2015-01-14201501160205ND
2015-01-14201501160206ND
2015-01-14201501160207ND
2015-01-14201501160208ND
2015-01-14201501160203ND
2015-04-10201504150970ND
2015-04-10201504150969ND
2015-04-10201504150968ND
2015-04-10201504150967ND
2015-04-10201504150966ND
2015-04-13201504150981ND
2015-07-02201507070500ND
2015-07-02201507070501ND
2015-07-02201507070502ND
2015-07-02201507070503ND
2015-07-02201507070504ND
2015-07-02201507070505ND
2015-10-09201510130642ND
2015-10-09201510130647ND
2015-10-09201510130646ND
2015-10-09201510130645ND
2015-10-09201510130644ND
2015-10-09201510130643ND
2016-01-07ND
2016-01-07ND
2016-01-07ND
2016-01-07ND
2016-01-07ND
2016-01-07ND
2016-04-14ND
2016-04-14ND
2016-07-21ND
2016-07-21ND
2016-10-06ND
2016-10-06ND
2017-01-12ND
2017-01-12ND
2017-01-23ND
2017-01-23ND
2017-04-06ND
2017-04-06ND
2017-04-06ND
2017-04-06ND
2017-07-14ND
2017-07-14ND
2017-07-14ND
2017-07-14ND
2017-10-06ND
2017-10-06ND
2017-10-06ND
2017-10-06ND
2018-01-11201801170693ND
2018-01-11201801170696ND
2018-01-11201801170694ND
2018-01-11201801170695ND
2018-04-05201804110018ND
2018-04-05201804110020ND
2018-04-05201804110019ND
2018-04-05201804110017ND
2018-07-06201807111033ND
2018-07-23201807250384ND
2018-07-23201807250383ND
2018-07-232018072503822.90 ppb
2018-10-04201810090518ND
2018-10-04201810090519ND
2018-10-04201810090521ND
2018-10-04201810090520ND
2019-01-04201901080075ND
2019-01-04201901080076ND
2019-01-04201901080074ND
2019-01-04201901080073ND
2019-04-02201904040350ND
2019-04-02201904040351ND
2019-04-02201904040348ND
2019-04-02201904040349ND
2019-07-26201907300315ND
2019-07-26201907300314ND
2019-07-26201907300316ND
2019-07-26201907300317ND
2019-10-032019100806132.60 ppb
2019-10-032019100806122.70 ppb
2019-10-03201910080614ND
2019-10-03201910080615ND