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EWG's Tap Water Database — 2021 UPDATE

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Diquat

City Of Rainier

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

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND30ND
2015ND10ND
2016ND10ND
2017ND10ND
2018ND10ND
2019ND10ND

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
2014-05-13K1404770001ND
2014-08-25K140909037006ND
2014-12-10K1413840ND
2015-01-16K1500467001-SND
2016-04-12K1603669001ND
2017-06-13K1706101001-SND
2018-11-191888902-SND
2019-12-10K1911528001-SND