Know Your Environment. Protect Your Health.

Diquat

Bear Valley Joint Authority

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

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND20ND
2020ND50ND
2021N/A00N/A
2022N/A00N/A
2023ND40ND

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
2018-04-248045215-01ND
2018-05-298055386-01ND
2018-07-178074944-01ND
2018-11-278114887-01ND
2019-02-199024042-01ND
2019-11-139036887-01ND
2020-01-2921798025.00ND
2020-04-1522362539.00ND
2020-04-2922362564.00ND
2020-07-2922949596.00ND
2020-08-1923136900.00ND
2023-05-1529053730.00ND
2023-05-1529053745.00ND
2023-07-1829651627.00ND
2023-07-1829651658.00ND