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EWG's Tap Water Database — 2021 UPDATE

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Diquat

North Franklin Water Works

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

MORE ABOUT THIS CONTAMINANT

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND80ND
2016ND140ND
2017N/A00N/A
2018N/A00N/A
2019ND280ND

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
2015-12-1435221371005ND
2015-12-1435221371004ND
2015-12-1435221371003ND
2015-12-1435221371002ND
2015-12-1435221371002ND
2015-12-1435221371005ND
2015-12-1435221371004ND
2015-12-1435221371003ND
2016-07-2135256051005ND
2016-07-2135256051004ND
2016-07-2135256051004ND
2016-07-2135256051005ND
2016-11-3035280570005ND
2016-11-3035280570004ND
2016-11-3035280570004ND
2016-11-3035280570003ND
2016-11-3035280570002ND
2016-11-3035280570001ND
2016-11-3035280570003ND
2016-11-3035280570002ND
2016-11-3035280570001ND
2016-11-3035280570005ND
2019-02-2535451014004ND
2019-02-2535451014003ND
2019-02-2535451014002ND
2019-02-2535451014001ND
2019-02-2535451014001ND
2019-02-2535451014004ND
2019-02-2535451014003ND
2019-02-2535451014002ND
2019-05-2035470274002ND
2019-05-2035470274001ND
2019-05-2035470274001ND
2019-05-2035470274002ND
2019-10-1435505635001ND
2019-10-1435505635008ND
2019-10-1435505635007ND
2019-10-1435505635006ND
2019-10-1435505635005ND
2019-10-1435505635004ND
2019-10-1435505635003ND
2019-10-1435505635002ND
2019-10-1435505635001ND
2019-10-1435505635008ND
2019-10-1435505635007ND
2019-10-1435505635006ND
2019-10-1435505635005ND
2019-10-1435505635004ND
2019-10-1435505635003ND
2019-10-1435505635002ND