Diquat
Western Greene
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 | 5 | 0 | ND |
2017 | ND | 3 | 0 | ND |
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 |
---|---|---|
2016-02-16 | 16049006208 | ND |
2016-02-16 | 16049006308 | ND |
2016-05-02 | 16126004408 | ND |
2016-05-02 | 16126004808 | ND |
2016-11-21 | 16328000703 | ND |
2017-01-11 | 17012006808 | ND |
2017-05-09 | 17130006307 | ND |
2017-07-18 | 17200000807 | ND |
2019-02-20 | 4205075 | ND |
2019-02-20 | 4205076 | ND |
2019-04-09 | 4255057 | ND |
2019-04-09 | 4255058 | ND |
2019-08-07 | 19220013608 | ND |
2019-11-05 | 19311000101 | ND |