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EWG's Tap Water Database

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Diquat

Arapahoe Cnty Wwwa

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

 

35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND140ND
2011ND50ND
2012ND140ND
2013N/A00N/A
2014ND20ND
2015N/A00N/A

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 6 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 20 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)20.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Result
2010-01-25ND
2010-01-25ND
2010-01-25ND
2010-02-01ND
2010-02-01ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-07-26ND
2010-07-27ND
2010-12-06ND
2011-01-19ND
2011-04-01ND
2011-04-01ND
2011-07-07ND
2011-07-07ND
2012-01-13ND
2012-01-13ND
2012-01-23ND
2012-01-23ND
2012-04-03ND
2012-04-03ND
2012-04-03ND
2012-04-06ND
2012-04-06ND
2012-04-06ND
2012-04-09ND
2012-07-05ND
2012-07-05ND
2012-07-05ND
2014-11-11ND
2014-11-11ND