Know Your Environment. Protect Your Health.

Diquat

Gateway

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

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND10ND
2021ND10ND
2022ND20ND
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-04-26CA1300018_001_001-201804260906ND
2019-07-25CA1300018_001_001-201907250800ND
2020-10-22CA1300018_001_001-202010221027ND
2021-02-25CA1300018_001_001-202102250745ND
2022-04-27CA1300018_001_001-202204271110ND
2022-07-28CA1300018_001_001-202207281045ND