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EWG's Tap Water Database — 2019 UPDATE

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Diquat

City of El Mirage

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

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND160ND
2014ND10ND
2015ND10ND
2016ND180ND
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
2012-02-212021572-01ND
2012-10-102100999-01ND
2013-02-273022031-01ND
2013-02-273022025-01ND
2013-02-273022032-01ND
2013-02-273022033-01ND
2013-02-273022034-01ND
2013-02-273022035-01ND
2013-02-273022036-01ND
2013-02-273022037-01ND
2013-07-223071896-01ND
2013-07-223071895-01ND
2013-07-223071894-01ND
2013-07-223071893-01ND
2013-07-223071892-01ND
2013-07-223071891-01ND
2013-07-233072038-01ND
2013-07-233072037-01ND
2014-02-114020905-02SND
2015-10-065100896-01ND
2016-03-076030608-01SND
2016-04-076040689-03SND
2016-04-076040689-02ND
2016-04-076040689-01ND
2016-05-166051378-01SND
2016-05-206051810-02SND
2016-05-206051810-01SND
2016-05-236051915-02SND
2016-05-236051915-01ND
2016-09-276092333-01SND
2016-12-146121326-01ND
2016-12-146121321-01ND
2016-12-156121430-01ND
2016-12-226121947-01SND
2016-12-276122102-01SND
2016-12-276122097-01SND
2016-12-286122222-01SOCND
2016-12-306122383-01SND