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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Garden City Water and Sewer System

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

 

13

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
2013ND80ND
2014N/A00N/A
2015N/A00N/A
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
2013-05-13S1320406ND
2013-05-13S1320403ND
2013-05-13S1320404ND
2013-05-13S1320401ND
2013-05-14S1320583ND
2013-05-14S1320586ND
2013-07-02S1328445ND
2013-07-02S1328446ND
2016-05-26S1622903ND
2016-05-26S1622947ND
2016-07-18S1631707ND
2016-07-18S1631708ND
2016-07-18S1631706ND