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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Bellefonte Borough Water Authority

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

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013N/A00N/A
2014ND20ND
2015ND10ND
2016ND40ND
2017ND50ND

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
2012-04-051208110-01ND
2012-04-191209243-01ND
2012-10-1812101416-01ND
2014-06-1114061493-01ND
2014-08-2114082551-01ND
2015-06-3012935784ND
2016-03-1614031421ND
2016-06-1514470316ND
2016-08-2514974537ND
2016-11-1715428392ND
2017-02-2215849412ND
2017-05-1616319938ND
2017-05-1616319912ND
2017-08-1716628612ND
2017-08-1716628638ND