Diquat
City of Apache Junction
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 | 1 | 0 | ND |
2016 | ND | 3 | 0 | ND |
2017 | ND | 5 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 4 | 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 |
---|---|---|
2015-12-21 | 5121791-01 | ND |
2016-03-15 | 6031295-01 | ND |
2016-03-15 | 6031295-02 | ND |
2016-04-05 | 6040336-02S | ND |
2017-01-05 | 7010476-01V | ND |
2017-01-05 | 7010476-02S | ND |
2017-05-19 | 7051996-01 | ND |
2017-05-19 | 7051996-02 | ND |
2017-07-06 | 7070405-02SOC | ND |
2019-01-22 | 19A2212-01 | ND |
2019-01-22 | 19A2212-02 | ND |
2019-07-23 | 19G2836-01 | ND |
2019-07-23 | 19G2836-02 | ND |