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EWG's Tap Water Database — 2019 UPDATE

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Diquat

City of Chicago

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

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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
2012-05-07SE20385-01_01ND
2012-05-07SE20386-01_01ND
2013-06-18SF31008-01_01ND
2013-06-18SF31009-01_01ND
2014-05-20SE40920-01_01ND
2014-05-20SE40922-01_01ND
2015-06-02SF50167-01_01ND
2015-06-02SF50168-01_01ND
2016-04-2516D0604-01_01ND
2016-04-2516D0606-01_01ND
2017-06-2717F1222-03_01ND
2017-06-2717F1222-01_01ND