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EWG's Tap Water Database — 2019 UPDATE

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Diquat

City of San Diego

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

 

56

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND90ND
2014ND110ND
2015ND120ND
2016ND90ND
2017ND90ND

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
2012-05-169437-001-0000ND
2012-05-169437-006-0000ND
2012-05-169437-010-0000ND
2012-08-159437-001-0000ND
2012-08-159437-006-0000ND
2012-08-159437-010-0000ND
2013-02-209437-010-0000ND
2013-02-209437-006-0000ND
2013-02-219437-001-0000ND
2013-05-229437-001-0000ND
2013-05-229437-010-0000ND
2013-05-229437-006-0000ND
2013-08-219437-006-0000ND
2013-08-219437-010-0000ND
2013-08-229437-001-0000ND
2014-02-199437-006-0000ND
2014-02-199437-010-0000ND
2014-02-199437-001-0000ND
2014-05-219437-010-0000ND
2014-05-219437-006-0000ND
2014-05-219437-001-0000ND
2014-09-229437-006-0000ND
2014-09-229437-010-0000ND
2014-09-229437-001-0000ND
2014-12-019437-001-0000ND
2014-12-019437-010-0000ND
2015-02-189437-010-0000ND
2015-02-189437-006-0000ND
2015-02-189437-001-0000ND
2015-05-209437-001-0000ND
2015-05-209437-010-0000ND
2015-05-209437-006-0000ND
2015-08-199437-001-0000ND
2015-08-199437-010-0000ND
2015-08-199437-006-0000ND
2015-11-189437-001-0000ND
2015-11-189437-010-0000ND
2015-11-189437-006-0000ND
2016-05-189437-001-0000ND
2016-05-189437-010-0000ND
2016-05-189437-006-0000ND
2016-08-179437-006-0000ND
2016-08-179437-001-0000ND
2016-08-179437-010-0000ND
2016-11-169437-006-0000ND
2016-11-169437-001-0000ND
2016-11-169437-010-0000ND
2017-02-159437-006-0000ND
2017-02-159437-001-0000ND
2017-02-159437-010-0000ND
2017-09-279437-006-0000ND
2017-09-279437-001-0000ND
2017-09-279437-010-0000ND
2017-11-159437-010-0000ND
2017-11-159437-006-0000ND
2017-11-159437-001-0000ND