Diquat
Valencia Water Company
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 8 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 8 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2014-03-05 | 9590-062-1045 | ND |
2014-03-12 | 9590-052-0850 | ND |
2014-03-26 | 9590-003-1000 | ND |
2014-03-26 | 9590-073-0820 | ND |
2014-06-04 | 9590-052-1000 | ND |
2014-06-04 | 9590-062-0900 | ND |
2014-06-25 | 9590-003-1030 | ND |
2014-06-25 | 9590-073-0820 | ND |
2017-03-02 | 9590-052-0950 | ND |
2017-03-02 | 9590-062-0907 | ND |
2017-03-23 | 9590-003-0805 | ND |
2017-03-23 | 9590-073-0907 | ND |
2017-06-01 | 9590-052-0855 | ND |
2017-06-01 | 9590-062-0930 | ND |
2017-06-22 | 9590-003-0850 | ND |
2017-06-22 | 9590-073-0950 | ND |