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EWG's Tap Water Database — 2019 UPDATE

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Diquat

Suez

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

 

121

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND160ND
2013ND140ND
2014ND200ND
2015ND190ND
2016ND290ND
2017ND230ND

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
2012-02-13S1204322ND
2012-04-10S1210107ND
2012-04-10S1210104ND
2012-06-20S1218355ND
2012-06-21S1218525ND
2012-06-25S1218863ND
2012-06-27S1219086ND
2012-07-17S1221654ND
2012-07-17S1221649ND
2012-07-18S1221921ND
2012-07-18S1221919ND
2012-07-18S1221918ND
2012-07-18S1221917ND
2012-07-18S1221915ND
2012-08-02S1223793ND
2012-10-30S1234016ND
2013-03-11S1310327ND
2013-03-27S1313027ND
2013-05-16S1321155ND
2013-05-16S1321151ND
2013-05-17S1321312ND
2013-05-20S1321566ND
2013-06-05S1323914ND
2013-06-05S1323921ND
2013-06-18S1326013ND
2013-07-09S1329342ND
2013-07-09S1329344ND
2013-07-10S1329590ND
2013-07-11S1329818ND
2013-09-09S1338782ND
2014-03-04S1407718ND
2014-03-04S1407730ND
2014-03-04S1407728ND
2014-03-04S1407733ND
2014-06-09S1420772ND
2014-06-10S1421072ND
2014-06-10S1421075ND
2014-06-12S1421492ND
2014-06-17S1422335ND
2014-06-17S1422328ND
2014-07-08S1425430ND
2014-07-16S1427067ND
2014-07-16S1427064ND
2014-07-17S1427225ND
2014-07-29S1428876ND
2014-07-30S1429110ND
2014-08-05S1429863ND
2014-08-11S1430897ND
2014-08-11S1430896ND
2014-08-19S1432278ND
2015-03-09S1508862ND
2015-05-27S1520480ND
2015-05-28S1520653ND
2015-05-28S1520648ND
2015-06-04S1521779ND
2015-06-04S1521773ND
2015-06-04S1521771ND
2015-06-15S1523190ND
2015-06-16S1523455ND
2015-06-24S1525300ND
2015-07-14S1528330ND
2015-07-14S1528327ND
2015-07-15S1528680ND
2015-07-22S1529750ND
2015-07-22S1529749ND
2015-07-22S1529747ND
2015-07-23S1530002ND
2015-07-23S1530008ND
2015-07-24S1530230ND
2016-06-23S1627649ND
2016-06-24S1627840ND
2016-06-24S1627839ND
2016-06-24S1627831ND
2016-06-24S1627838ND
2016-06-27S1628127ND
2016-06-27S1628118ND
2016-06-27S1628113ND
2016-06-27S1628111ND
2016-06-28S1628434ND
2016-06-29S1628657ND
2016-06-29S1628653ND
2016-06-30S1628758ND
2016-06-30S1628755ND
2016-06-30S1628757ND
2016-07-06S1629588ND
2016-07-06S1629581ND
2016-07-06S1629585ND
2016-07-06S1629586ND
2016-07-06S1629587ND
2016-07-07S1629728ND
2016-07-07S1629732ND
2016-07-15S1631434ND
2016-07-15S1631433ND
2016-08-03S1634935ND
2016-08-03S1634932ND
2016-08-29S1639083ND
2016-08-29S1639084ND
2016-08-29S1639085ND
2017-03-13S1709901ND
2017-03-14S1710135ND
2017-05-31S1722763ND
2017-05-31S1722762ND
2017-05-31S1722761ND
2017-05-31S1722756ND
2017-06-19S1726107ND
2017-06-19S1726108ND
2017-06-19S1726109ND
2017-06-19S1726110ND
2017-06-21S1726771ND
2017-07-10S1729866ND
2017-07-10S1729870ND
2017-07-11S1730137ND
2017-07-20S1732219ND
2017-07-25S1732811ND
2017-07-25S1732815ND
2017-08-03S1734567ND
2017-08-03S1734565ND
2017-08-14S1736477ND
2017-09-20S1743291ND
2017-09-26S1744547ND
2017-10-20S1749223ND