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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Beauregard Water Works District #3

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

 

44

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
2013ND100ND
2014N/A00N/A
2015ND20ND
20160.0860 ppb202ND - 0.860 ppb
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
2012-06-193560137W12ND
2012-06-193560137W12ND
2012-11-05AD72984ND
2012-11-05AD72985ND
2012-11-05AD72986ND
2012-11-05AD72987ND
2012-11-05AD72988ND
2012-11-05AD72985ND
2012-11-05AD72984ND
2012-11-05AD72986ND
2012-11-05AD72987ND
2012-11-05AD72988ND
2013-01-14AD74761ND
2013-01-14AD74760ND
2013-01-14AD74759ND
2013-01-14AD74758ND
2013-01-14AD74757ND
2013-01-14AD74759ND
2013-01-14AD74760ND
2013-01-14AD74761ND
2013-01-14AD74757ND
2013-01-14AD74758ND
2015-03-0235177665002ND
2015-03-0235177665002ND
2016-01-1935225812001ND
2016-01-19352258120050.860 ppb
2016-01-1935225812004ND
2016-01-1935225812003ND
2016-01-1935225812002ND
2016-01-19352258120050.860 ppb
2016-01-1935225812002ND
2016-01-1935225812001ND
2016-01-1935225812003ND
2016-01-1935225812004ND
2016-02-0135227539002ND
2016-02-0135227539003ND
2016-02-0135227539004ND
2016-02-0135227539001ND
2016-02-0135227539001ND
2016-02-0135227539002ND
2016-02-0135227539003ND
2016-02-0135227539004ND
2016-05-0235242594004ND
2016-05-0235242594004ND