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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Lockport

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

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND50ND
2014N/A00N/A
2015ND100ND
2016N/A00N/A
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
2012-08-281208F10-003AND
2012-08-281208F10-015AND
2012-08-281208F10-012AND
2012-08-281208F10-009AND
2012-08-281208F10-006AND
2013-03-261303B65-006AND
2013-03-261303B65-003AND
2013-03-261303B65-009AND
2013-04-091304548-003AND
2013-04-091304548-006AND
2015-08-041508225-015AND
2015-08-041508225-012AND
2015-08-041508225-009AND
2015-08-041508225-006AND
2015-08-041508225-003AND
2015-11-101511802-004AND
2015-11-101511802-006AND
2015-11-101511802-002AND
2015-11-101511802-008AND
2015-11-101511802-010AND