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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Oyster Bay Water District

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
2012ND50ND
2013N/A00N/A
2014ND50ND
2015ND50ND
2016ND50ND
2017N/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 Lab ID Result
2012-12-191212988-001-SOCSND
2012-12-191212988-002-SOCSND
2012-12-191212988-004-SOCSND
2012-12-191212988-003-SOCSND
2012-12-211212B33-001-SOCSND
2014-06-041406268-004-SOCSND
2014-06-041406268-005-SOCSND
2014-06-041406268-002-SOCSND
2014-06-041406268-001-SOCSND
2014-06-041406268-003-SOCSND
2015-05-201505E61-003-SOCSND
2015-05-201505E61-001-SOCSND
2015-05-201505E61-002-SOCSND
2015-05-201505E61-004-SOCSND
2015-05-201505E61-005-SOCSND
2016-06-281606Q85-003-SOCSND
2016-06-281606Q85-004-SOCSND
2016-06-281606Q85-001-SOCSND
2016-06-281606Q85-002-SOCSND
2016-06-291606S10-001-SOCSND