Diquat
Aurora, City of
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 | 1 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 4 | 0 | ND |
2018 | ND | 6 | 0 | ND |
2019 | ND | 6 | 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 |
---|---|---|
2014-02-26 | 282289 | ND |
2017-02-13 | ND | |
2017-02-13 | ND | |
2017-04-17 | ND | |
2017-07-25 | ND | |
2018-04-09 | 546084 | ND |
2018-04-09 | 546083 | ND |
2018-04-09 | 546082 | ND |
2018-09-10 | 561259 | ND |
2018-09-10 | 561260 | ND |
2018-09-10 | 561261 | ND |
2019-04-15 | 605630 | ND |
2019-04-15 | 605631 | ND |
2019-08-26 | 621598 | ND |
2019-08-26 | 621597 | ND |
2019-09-10 | 634719 | ND |
2019-10-15 | 638523 | ND |