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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Town of Gilbert

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

 

65

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0228 ppb181ND - 0.410 ppb
2013ND160ND
2014ND20ND
2015ND200ND
2016ND70ND
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
2012-01-18PVA1140-010.410 ppb
2012-01-18PVA1134-01ND
2012-02-09PVB0701-01AND
2012-02-28PVB1867-01CND
2012-03-01PVC0073-01CND
2012-03-15PVC1257-01SND
2012-04-02PVD0064-01SND
2012-04-09PVD0611-01SND
2012-04-18PVD1294-01AND
2012-05-02PVE0219-01SND
2012-07-02PVG0068-01CND
2012-07-02PVG0062-01ND
2012-07-26PVG1876-01SND
2012-08-28PVH2122-01SND
2012-10-01PVJ0070-01SND
2012-10-01PVJ0064-01SND
2012-10-01PVJ0072-01SND
2012-12-20PVL1426-01SND
2013-01-16PWA1119-01ND
2013-01-17PWA1115-01ND
2013-01-28PWA1665-01SND
2013-04-15550-735-1SND
2013-04-24550-1401-1ND
2013-07-01550-5830-1ND
2013-07-30550-7716-1ND
2013-07-31550-7815-1ND
2013-07-31550-7810-1SND
2013-08-26550-9435-1SND
2013-08-27550-9504-1ND
2013-10-23201310230679SND
2013-11-04201311040062SND
2013-11-26201311260349SND
2013-11-26201311260351SND
2013-11-26201311260347SND
2014-01-27201401270088SND
2014-10-07201410070504SND
2015-01-13201501130297SND
2015-01-14201501140577SND
2015-01-27201501270263SND
2015-01-28201501280380SND
2015-01-28201501280358SND
2015-02-03201502030356SND
2015-02-05201502050484SND
2015-02-10201502100324SND
2015-02-17201502170339SND
2015-02-18201502180275SND
2015-02-24201502240346SND
2015-02-24201502240342SND
2015-05-13201505130231SND
2015-07-08201507080265SND
2015-07-21201507220465SND
2015-07-28201507260234SND
2015-08-17201508170183SND
2015-09-10201509100492SND
2015-09-10201509100491SND
2015-09-10201509100490SND
2016-01-06201601070016SND
2016-01-26201601260359SND
2016-05-31201605310476SND
2016-07-06201607060612SND
2016-07-06201607060594SND
2016-07-20201607200605SND
2016-10-18201610180285SND
2017-01-04201701040825SND
2017-07-27201707280101SND