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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Forrest City Waterworks

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

 

12

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
2013ND40ND
2014ND20ND
2015N/A00N/A
2016ND40ND
2017ND20ND

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
2013-08-2713241000308ND
2013-08-2713241000208ND
2013-11-0513310000808ND
2013-11-0513310000908ND
2014-04-2314114013808ND
2014-08-2714240000608ND
2016-07-0616189013508ND
2016-07-0616189013608ND
2016-10-0316279003207ND
2016-10-0316279003107ND
2017-04-0317096000208ND
2017-07-3117215001706ND