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EWG's Tap Water Database — 2021 UPDATE

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Diquat

City of Phoenix

Diquat is a herbicide used on potato crops and aquatic weeds.

MORE ABOUT THIS CONTAMINANT

 

102

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
2014ND210ND
2015ND30ND
2016ND20ND
2017ND440ND
2018ND250ND
2019ND70ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 6 ppb

The EWG Health Guideline of 6 ppb for diquat was defined 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 cataracts.

EPA Maximum Contaminant
Level (MCL) 20 ppb

The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-064010287-01SND
2014-01-08201401080636SND
2014-01-15201401150541SND
2014-01-15201401170166SND
2014-01-16201401160572SND
2014-01-16201401170157SND
2014-01-21201401210423SND
2014-01-21201401210441SND
2014-02-18201402180233SND
2014-02-19201402190366SND
2014-02-26201402260766SND
2014-07-01201407010323SND
2014-07-01201407010388SND
2014-07-02201407020643SND
2014-07-08201407091000SND
2014-07-09201407090993SND
2014-07-15201407150423SND
2014-07-16201407160714SND
2014-07-22201407220315SND
2014-07-23201407230692SND
2014-07-23201407230699SND
2015-02-03201502030366SND
2015-07-08201507090343SND
2015-10-06201510060435SND
2016-01-05201601060240SND
2016-07-05201607050435SND
2017-01-04201701040662SND
2017-01-04201701050379SND
2017-01-04201701050399SND
2017-01-04201701050453SND
2017-01-04201701050478SND
2017-01-05201701050488SND
2017-01-10201701100453SND
2017-01-10201701100461SND
2017-01-11201701120606SND
2017-01-11201701120613SND
2017-01-17201701180217SND
2017-01-17201701180224SND
2017-01-18201701180240SND
2017-01-18201701180352SND
2017-01-25201701250391SND
2017-01-25201701250404SND
2017-02-01201702010377SND
2017-02-08201702080308SND
2017-02-22201702220346SND
2017-03-28201703291083SND
2017-04-27201704270392SND
2017-04-27201704270403SND
2017-07-05201707050526SND
2017-07-11201707110865SND
2017-07-11201707110871SND
2017-07-12201707130580SND
2017-07-12201707130586SND
2017-07-13201707130593SND
2017-07-13201707130603SND
2017-07-13201707130610SND
2017-07-13201707130640SND
2017-07-13201707130646SND
2017-07-18201707190871SND
2017-07-19201707190854SND
2017-07-26201707280157SND
2017-07-27201707280167SND
2017-07-27201707280180SND
2017-08-01201708020903SND
2017-08-01201708020918SND
2017-08-02201708030622SND
2017-08-02201708030628SND
2017-08-03201708030643SND
2017-10-10201710100361SND
2017-10-12201710120507SND
2018-04-03201804030480SND
2018-04-04201804040804SND
2018-04-04201804040811SND
2018-04-10201804100289SND
2018-04-12201804120900SND
2018-04-17201804180657SND
2018-04-19201804190479SND
2018-04-19201804190485SND
2018-04-26201804260508SND
2018-04-26201804260514SND
2018-05-22201805220530SND
2018-07-18201807180602SND
2018-07-26201807260415SND
2018-10-01201810010205SND
2018-10-02201810020711SND
2018-10-10201810100941SND
2018-10-10201810100947SND
2018-10-11201810110666SND
2018-10-16201810160509SND
2018-10-18201810190032SND
2018-10-24201810250277SND
2018-10-25201810250286SND
2018-10-30201810310416SND
2018-10-30201810310426SND
2018-11-29201811290363SND
2019-01-16201901160417SND
2019-01-29201901290202SND
2019-04-16201904160465SND
2019-04-24201904240287SND
2019-07-25201907250234SND
2019-10-17201910170330SND
2019-11-05201911051073SND