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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Doyon Utilities Jber - Richardson

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

 

33

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND160ND
2013N/A00N/A
2014N/A00N/A
2015ND120ND
2016ND10ND
2017ND40ND

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
2012-01-23PE*2581093ND
2012-01-23PE*2581107ND
2012-01-23PE*2581110ND
2012-01-23PE*2581117ND
2012-01-23PE*2581080ND
2012-04-23PE*2629749ND
2012-04-23PE*2629765ND
2012-04-23PE*2629786ND
2012-04-23PE*2629811ND
2012-07-24PE*2682056ND
2012-07-24PE*2682128ND
2012-07-24PE*2682081ND
2012-11-26PE*2745630ND
2012-11-26PE*2745644ND
2012-11-26PE*2745654ND
2012-11-26PE*2745664ND
2015-02-24PE*3195305ND
2015-02-24PE*3195669ND
2015-02-24PE*3195336ND
2015-06-23PE*3268441ND
2015-06-23PE*3268598ND
2015-06-23PE*3268613ND
2015-09-14PE*3322322ND
2015-09-14PE*3322333ND
2015-09-14PE*3322350ND
2015-12-07PE*3371147ND
2015-12-07PE*3371160ND
2015-12-07PE*3371170ND
2016-03-29PE*3422161ND
2017-03-06PE*3649758ND
2017-05-22PE*3698675ND
2017-08-28PE*3767825ND
2017-10-11PE*3797937ND