Diquat
Gaston Rural Water District (sc3220002)
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 | N/A | 0 | 0 | N/A |
2015 | ND | 8 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 6 | 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 |
---|---|---|
2015-02-09 | AD51282 | ND |
2015-04-15 | AD54180 | ND |
2015-07-22 | AD58531 | ND |
2015-07-22 | AD58532 | ND |
2015-07-22 | AD58533 | ND |
2015-07-22 | AD58534 | ND |
2015-07-22 | AD58535 | ND |
2015-07-22 | AD58536 | ND |
2017-04-25 | AD93097 | ND |
2017-04-25 | AD93098 | ND |
2017-04-25 | AD93099 | ND |
2017-05-08 | AD93870 | ND |
2017-05-08 | AD93871 | ND |
2017-05-08 | AD93872 | ND |