Diquat
Opp Utilities Board
Diquat is a herbicide used on potato crops and aquatic weeds.
22
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 11 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 11 | 0 | ND |
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 |
|---|---|---|
| 2016-05-31 | 37505312016-2 | ND |
| 2016-05-31 | 37505312016-3 | ND |
| 2016-05-31 | 37505312016-1 | ND |
| 2016-06-01 | 37505312016-4 | ND |
| 2016-06-01 | 37505312016-6 | ND |
| 2016-06-01 | 37505312016-5 | ND |
| 2016-09-06 | 37509062016-5 | ND |
| 2016-09-06 | 37509062016-4 | ND |
| 2016-09-06 | 37509062016-1 | ND |
| 2016-09-06 | 37509062016-3 | ND |
| 2016-09-06 | 37509062016-2 | ND |
| 2019-04-16 | 189530-01SOC | ND |
| 2019-04-16 | 189525-01SOC | ND |
| 2019-04-16 | 189526-01SOC | ND |
| 2019-04-16 | 189527-01SOC | ND |
| 2019-04-16 | 189528-01SOC | ND |
| 2019-04-16 | 189524-01SOC | ND |
| 2019-08-20 | 194267-01SOC | ND |
| 2019-08-20 | 194271-01SOC | ND |
| 2019-08-20 | 194268-01SOC | ND |
| 2019-08-20 | 194272-01SOC | ND |
| 2019-08-20 | 194269-01SOC | ND |