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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Three Valleys Municipal Water District

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

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND30ND
2014ND30ND
2015ND20ND
2016ND50ND
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
2012-04-179588-002-1100ND
2012-05-159588-002-1100ND
2012-06-139588-004-1200ND
2012-09-119588-004-0800ND
2012-09-119588-002-0000ND
2013-03-069588-002-1040ND
2013-06-119588-002-0830ND
2013-12-179588-002-1000ND
2014-02-189588-002-0800ND
2014-06-109588-004-1030ND
2014-09-169588-004-1101ND
2015-03-105867-002-0930ND
2015-06-099588-004-0940ND
2016-03-153761-002-0900ND
2016-06-213761-004-1006ND
2016-06-213761-002-1030ND
2016-09-133761-002-1000ND
2016-12-133761-002-1020ND
2017-03-213761-004-1040ND
2017-06-213761-004-1100ND
2017-06-213761-002-1000ND
2017-09-123761-002-0900ND