Diquat
Red Hill Waterworks Inc.
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 | 12 | 0 | ND |
2017 | ND | 2 | 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 |
---|---|---|
2016-02-04 | 35228303005 | ND |
2016-02-04 | 35228303004 | ND |
2016-02-04 | 35228303003 | ND |
2016-02-04 | 35228303004 | ND |
2016-02-04 | 35228303005 | ND |
2016-02-04 | 35228303003 | ND |
2016-12-08 | 35282709004 | ND |
2016-12-08 | 35282709005 | ND |
2016-12-08 | 35282709006 | ND |
2016-12-08 | 35282709006 | ND |
2016-12-08 | 35282709005 | ND |
2016-12-08 | 35282709004 | ND |
2017-10-17 | 35342600001 | ND |
2017-10-17 | 35342600001 | ND |
2019-09-13 | 35498092001 | ND |
2019-09-13 | 35498092003 | ND |
2019-09-13 | 35498092002 | ND |
2019-09-13 | 35498092001 | ND |
2019-09-13 | 35498092003 | ND |
2019-09-13 | 35498092002 | ND |