Diquat
Start Water System
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 | 0.950 ppb | 4 | 2 | ND - 1.90 ppb |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 4 | 0 | ND |
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 |
---|---|---|
2016-02-02 | 35228036001 | ND |
2016-02-02 | 35228036002 | 1.90 ppb |
2016-02-02 | 35228036001 | ND |
2016-02-02 | 35228036002 | 1.90 ppb |
2018-10-15 | 35424735004 | ND |
2018-10-15 | 35424735005 | ND |
2018-10-15 | 35424735004 | ND |
2018-10-15 | 35424735005 | ND |