Diquat
Paw Blue Mountain Division
Diquat is a herbicide used on potato crops and aquatic weeds.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 6 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 5 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 1 | 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 |
---|---|---|
2014-04-09 | 25336701 | ND |
2014-04-09 | 25336401 | ND |
2014-04-09 | 25336201 | ND |
2014-07-09 | 26112701 | ND |
2014-07-09 | 26112401 | ND |
2014-07-09 | 26112301 | ND |
2017-04-05 | 15990785 | ND |
2017-04-10 | 15990727 | ND |
2017-04-12 | 15990756 | ND |
2017-07-12 | 16463513 | ND |
2017-07-12 | 16463484 | ND |
2019-07-16 | 45238801 | ND |