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EWG's Tap Water Database — 2021 UPDATE

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Diquat

Meriden Water Division

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

MORE ABOUT THIS CONTAMINANT

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND140ND
2015N/A00N/A
2016ND20ND
2017N/A00N/A
2018ND20ND
2019ND140ND

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
2014-05-29BG50269SOC5ND
2014-05-29BG50268SOC5ND
2014-05-29BG50270SOC5ND
2014-06-26BG65689SOC5ND
2014-06-26BG65690SOC5ND
2014-06-26BG65691SOC5ND
2014-07-10BG72748SOC5ND
2014-09-24BH19407SOC5ND
2014-09-24BH19408SOC5ND
2014-10-29BH34198SOC5ND
2014-10-29BH34199SOC5ND
2014-10-29BH34200SOC5ND
2014-10-29BH34201SOC5ND
2014-12-18BH55039SOC5ND
2016-01-21BK55828SOC5ND
2016-04-28BN21072SOC5ND
2018-10-24CB81094ND
2018-10-24CB81095ND
2019-01-16CC30223ND
2019-01-16CC30225ND
2019-01-16CC30226ND
2019-03-06CC63089ND
2019-04-17CC96464ND
2019-04-25CD01541ND
2019-04-25CD01542ND
2019-04-29CD03411ND
2019-05-29CD22755ND
2019-06-19CD38006ND
2019-06-19CD38007ND
2019-07-31CD69100ND
2019-09-25CE17376ND
2019-12-16CE88625ND