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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Wauconda

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

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND20ND
2014ND100ND
2015ND20ND
2016N/A00N/A
2017ND100ND

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
2012-02-132021650-01ND
2012-07-172072672-01ND
2012-10-242103656-01ND
2013-01-153012368-03ND
2013-04-033040890-01ND
2014-02-254023383-01ND
2014-02-254023383-02ND
2014-02-254023380-01ND
2014-02-254023380-02ND
2014-02-264023409-01ND
2014-04-294050133-01ND
2014-04-294050133-04ND
2014-04-294050133-03ND
2014-04-294050133-02ND
2014-05-074051334-01ND
2015-05-205053337-01ND
2015-09-165092897-01ND
2017-02-077021652-01ND
2017-02-077021683-01ND
2017-02-077021683-02ND
2017-02-077021657-01ND
2017-02-207023460-01ND
2017-04-177042667-01ND
2017-06-017060138-01ND
2017-06-017060138-02ND
2017-06-017060138-03ND
2017-06-077061449-01ND