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EWG's Tap Water Database — 2021 UPDATE

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Diquat

Marion Oaks Subdivision

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

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015N/A00N/A
2016N/A00N/A
2017ND100ND
2018N/A00N/A
2019N/A00N/A

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
2014-01-08ND
2014-01-08ND
2014-01-21ND
2014-01-21ND
2014-01-21ND
2014-04-09ND
2014-04-09ND
2014-04-15ND
2014-04-16ND
2014-04-16ND
2017-02-28ND
2017-02-28ND
2017-03-13ND
2017-03-13ND
2017-03-14ND
2017-05-17ND
2017-05-17ND
2017-05-18ND
2017-05-23ND
2017-05-23ND