Diquat
Zone 7 Water Agency
Diquat is a herbicide used on potato crops and aquatic weeds.
14
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
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 | 4 | 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 |
|---|---|---|
| 2014-06-09 | 9590-001-1000 | ND |
| 2014-06-09 | 9590-008-1055 | ND |
| 2014-06-10 | 9590-005-1040 | ND |
| 2014-06-10 | 9590-011-1000 | ND |
| 2014-06-11 | 9590-006-0825 | ND |
| 2014-06-11 | 9590-013-0930 | ND |
| 2014-06-16 | 9590-007-0910 | ND |
| 2014-06-17 | 9590-012-1125 | ND |
| 2014-06-19 | 9590-019-0935 | ND |
| 2014-11-13 | 9590-017-0905 | ND |
| 2017-07-11 | 5867-001-0935 | ND |
| 2017-07-11 | 5867-008-0955 | ND |
| 2017-07-12 | 5867-012-0900 | ND |
| 2017-09-25 | 5867-005-1010 | ND |