Diquat
Lexington
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | ND | 1 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 4 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-12-08 | AI60935 | ND |
| 2015-02-02 | AI63938 | ND |
| 2015-05-04 | AI76406 | ND |
| 2015-08-10 | AI86124 | ND |
| 2016-02-08 | AJ06242 | ND |
| 2016-05-16 | AJ12525 | ND |
| 2016-07-19 | AJ18874 | ND |
| 2016-10-03 | AJ30605 | ND |
| 2018-01-09 | AJ76519 | ND |
| 2018-04-24 | AJ87941 | ND |
| 2018-07-18 | AJ94699 | ND |
| 2018-10-17 | AK04253 | ND |