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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Palm Beach County Water Utilities

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

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND80ND
2015ND40ND
2016ND30ND
2017ND80ND

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 Result
2014-05-15ND
2014-05-20ND
2014-05-22ND
2014-05-29ND
2014-12-12ND
2014-12-12ND
2014-12-12ND
2014-12-12ND
2015-06-16ND
2015-06-16ND
2015-06-17ND
2015-06-22ND
2016-05-04ND
2016-05-11ND
2016-05-24ND
2017-05-03ND
2017-05-10ND
2017-05-17ND
2017-05-30ND
2017-08-07ND
2017-08-08ND
2017-08-09ND
2017-08-17ND