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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Mission Springs WD

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

 

30

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
2014ND200ND
2015N/A00N/A
2016N/A00N/A
2017ND100ND

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
2014-02-049588-014-0830ND
2014-02-049588-011-1048ND
2014-02-049588-026-0920ND
2014-02-049588-025-0950ND
2014-02-049588-008-0750ND
2014-02-119588-013-1015ND
2014-02-119588-010-0730ND
2014-02-119588-015-0830ND
2014-02-119588-017-0950ND
2014-02-119588-030-0910ND
2014-07-079588-014-0911ND
2014-07-079588-026-0825ND
2014-07-089588-015-0849ND
2014-07-089588-010-0747ND
2014-07-089588-008-0817ND
2014-07-089588-030-0922ND
2014-07-099588-025-1118ND
2014-07-099588-017-1051ND
2014-07-099588-013-1035ND
2014-07-099588-011-1203ND
2017-06-013761-013-1108ND
2017-06-013761-015-1246ND
2017-06-053761-026-1200ND
2017-06-053761-014-1130ND
2017-06-063761-025-1300ND
2017-06-063761-017-1100ND
2017-06-063761-011-1200ND
2017-06-063761-010-0945ND
2017-06-073761-030-1200ND
2017-06-073761-008-1124ND