Diquat
City of Douglas
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 | ND | 8 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 12 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 12 | 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 |
---|---|---|
2014-03-04 | 4030264-01S | ND |
2014-03-26 | 4032085-01 | ND |
2014-06-03 | 4060268-02S | ND |
2014-06-03 | 4060268-01S | ND |
2014-09-09 | 4090773-02 | ND |
2014-09-09 | 4090773-01 | ND |
2014-12-01 | 4120289-02 | ND |
2014-12-01 | 4120289-01 | ND |
2016-06-07 | 6060557-06 | ND |
2016-06-07 | 6060557-05 | ND |
2016-06-07 | 6060557-04 | ND |
2016-06-07 | 6060557-03 | ND |
2016-06-07 | 6060557-02 | ND |
2016-06-07 | 6060557-01 | ND |
2016-12-06 | 6120426-05S | ND |
2016-12-06 | 6120426-06S | ND |
2016-12-06 | 6120426-04S | ND |
2016-12-06 | 6120426-03S | ND |
2016-12-06 | 6120426-02S | ND |
2016-12-06 | 6120426-01 | ND |
2019-06-13 | 19F1542-06 | ND |
2019-06-13 | 19F1542-05 | ND |
2019-06-13 | 19F1542-04 | ND |
2019-06-13 | 19F1542-03 | ND |
2019-06-13 | 19F1542-02 | ND |
2019-06-13 | 19F1542-01 | ND |
2019-09-17 | 19I1862-05 | ND |
2019-09-17 | 19I1862-04 | ND |
2019-09-17 | 19I1862-03 | ND |
2019-09-17 | 19I1862-02 | ND |
2019-09-17 | 19I1862-01 | ND |
2019-12-12 | 19L1610-01 | ND |