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EWG's Tap Water Database — 2019 UPDATE

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Diquat

St. Louis City

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

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND80ND
2013ND60ND
2014ND60ND
2015ND20ND
2016ND60ND
2017ND60ND

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
2012-03-28CRCW032812M549ND
2012-03-28HBCB032812M549ND
2012-06-27CRCW062712M549ND
2012-06-27HBCB062712M549ND
2012-09-24CRCW092412M549ND
2012-09-24HBCB092412M549ND
2012-11-08CRCW110812M549ND
2012-11-08HBCB110812M549ND
2013-03-15HBCB031513M549ND
2013-03-15CRCW031513M549ND
2013-05-23CRCW052313M549ND
2013-05-23HBCB052313M549ND
2013-11-12CRCW111213M549ND
2013-11-12HBCB111213M549ND
2014-03-19CRCW031914M549ND
2014-03-19HBCB031914M549ND
2014-06-18HBCB061814M549ND
2014-06-18CRCW061814M549ND
2014-09-25CRCW092514M549ND
2014-09-25HBCB092514M549ND
2015-11-19HBCB111915M549ND
2015-11-19CRCW111915M549ND
2016-03-28HBCB032816M549ND
2016-03-28CRCW032816M549ND
2016-08-22CRCW082216M549ND
2016-08-22HBCB082216M549ND
2016-11-21HBCB112116M549ND
2016-11-21CRCW112116M549ND
2017-02-27CRCW022717M549ND
2017-02-27HBCB022717M549ND
2017-09-26HBCB092617M549ND
2017-09-26CRCW092617M549ND
2017-11-17CRCW111717M549ND
2017-11-17HBCB111717M549ND