Diquat
St. Elmo-irvington Water Authority
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 | N/A | 0 | 0 | N/A |
2016 | ND | 6 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 6 | 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 |
---|---|---|
2016-03-30 | 400-119519-1 | ND |
2016-03-30 | 400-119519-3 | ND |
2016-03-30 | 400-119519-2 | ND |
2016-08-25 | 400-126347-3 | ND |
2016-08-25 | 400-126347-1 | ND |
2016-08-25 | 400-126347-2 | ND |
2019-02-18 | 680-164707-3 | ND |
2019-02-18 | 680-164707-2 | ND |
2019-02-18 | 680-164707-1 | ND |
2019-08-15 | 680-173140-3 | ND |
2019-08-15 | 680-173140-1 | ND |
2019-08-15 | 680-173140-2 | ND |