Diquat
Hilton Head PSD 1
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 | N/A | 0 | 0 | N/A |
2015 | ND | 7 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 4 | 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 |
---|---|---|
2015-03-09 | AD52642 | ND |
2015-03-09 | AD52647 | ND |
2015-03-09 | AD52650 | ND |
2015-03-09 | AD52653 | ND |
2015-03-09 | AD52656 | ND |
2015-03-09 | AD52658 | ND |
2015-03-09 | AD52661 | ND |
2019-02-25 | AE26252 | ND |
2019-02-25 | AE26213 | ND |
2019-02-25 | AE26217 | ND |
2019-02-25 | AE26250 | ND |