Diquat
SJWD Middle Tyger WTP
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 | 2 | 0 | ND |
2015 | ND | 1 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 2 | 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 |
---|---|---|
2014-05-13 | AD39799 | ND |
2014-05-13 | AD39842 | ND |
2015-05-05 | AD54911 | ND |
2016-06-15 | AD77332 | ND |
2016-12-13 | AD87058 | ND |
2017-04-26 | AD93225 | ND |
2017-06-15 | AD96073 | ND |
2018-05-02 | AE11609 | ND |
2018-06-20 | AE14002 | ND |
2019-08-27 | AE36139 | ND |
2019-08-27 | AE36137 | ND |