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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Philadelphia Water Department

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

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND60ND
2015ND30ND
2016ND30ND
2017ND60ND

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
2014-04-07201404100426ND
2014-04-07201404100425ND
2014-04-07201404100424ND
2014-08-19201408230072ND
2014-08-19201408230071ND
2014-08-19201408230073ND
2015-06-1012887854ND
2015-06-1012887848ND
2015-06-1012887842ND
2016-06-0314411721ND
2016-06-0314411746ND
2016-06-0314411771ND
2017-05-1616100975ND
2017-05-1616101000ND
2017-05-1616100950ND
2017-07-2416420613ND
2017-07-2416420588ND
2017-07-2416420638ND