Diquat
City of Buckeye Sonora - Sundance
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 | 0.0550 ppb | 6 | 1 | ND - 0.330 ppb |
2015 | ND | 2 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 4 | 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 |
---|---|---|
2014-05-07 | 484777-001A | ND |
2014-05-07 | 484934-001A | ND |
2014-09-04 | 492627-001C | ND |
2014-09-04 | 492628-001C | ND |
2014-10-23 | 495554-001B | ND |
2014-10-29 | 496126-001B | 0.330 ppb |
2015-03-12 | 503711-001 | ND |
2015-03-12 | 503712-001 | ND |
2016-02-23 | 525398-001B | ND |
2016-02-24 | 525405-001B | ND |
2017-04-13 | 550767-001 | ND |
2017-04-27 | 551845-001A | ND |
2017-09-27 | 563905-001B | ND |
2017-09-27 | 563906-001B | ND |