Diquat
Hemlock Farms (main)
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 | 10 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 10 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
2019 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2014-04-15 | 14041845-001 | ND |
2014-04-15 | 14041839-001 | ND |
2014-04-15 | 14041858-001 | ND |
2014-04-28 | 14050058-001 | ND |
2014-04-28 | 14050059-001 | ND |
2014-08-11 | 14081392-002 | ND |
2014-08-11 | 14081392-003 | ND |
2014-08-11 | 14081392-001 | ND |
2014-08-11 | 14081392-005 | ND |
2014-08-11 | 14081392-004 | ND |
2017-04-26 | 15961266 | ND |
2017-04-26 | 15961265 | ND |
2017-04-26 | 15961267 | ND |
2017-05-02 | 16119240 | ND |
2017-05-02 | 16119239 | ND |
2017-08-08 | 16590235 | ND |
2017-08-15 | 16590284 | ND |
2017-08-15 | 16590285 | ND |
2017-08-22 | 16590287 | ND |
2017-08-22 | 16590286 | ND |