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EWG's Tap Water Database — 2019 UPDATE

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Diquat

SBNDO County Service Area 70J

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

 

11

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
2013ND10ND
2014ND50ND
2015N/A00N/A
2016N/A00N/A
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
2013-10-189588-005-1020ND
2014-02-039588-001-1130ND
2014-02-039588-002-1030ND
2014-02-039588-003-0930ND
2014-02-039588-005-1345ND
2014-02-049588-004-1300ND
2017-07-313761-001-1245ND
2017-07-313761-005-1115ND
2017-08-013761-002-1145ND
2017-08-013761-003-1300ND
2017-08-013761-004-1230ND