Diquat
Community WC of Green Valley
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 | 1 | 0 | ND |
2015 | ND | 1 | 0 | ND |
2016 | ND | 4 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 8 | 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 |
---|---|---|
2014-03-19 | 4031553-03S | ND |
2015-03-26 | 5032161-01 | ND |
2016-06-27 | 6062198-01S | ND |
2016-06-27 | 6062198-02S | ND |
2016-06-27 | 6062198-03S | ND |
2016-06-27 | 6062198-04S | ND |
2019-02-04 | 19B0146-01 | ND |
2019-02-04 | 19B0146-02 | ND |
2019-02-04 | 19B0146-03 | ND |
2019-02-04 | 19B0146-04 | ND |
2019-07-30 | 19G3440-01 | ND |
2019-07-30 | 19G3440-02 | ND |
2019-07-30 | 19G3440-03 | ND |
2019-07-30 | 19G3440-04 | ND |