Diquat
Valley of The Moon Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-02-12 | 5810-002-0857 | ND |
| 2014-02-12 | 5810-004-0927 | ND |
| 2016-02-19 | 5810-001-0918 | ND |
| 2016-02-19 | 5810-003-0753 | ND |
| 2016-02-19 | 5810-005-1036 | ND |
| 2017-02-15 | 5810-002-0800 | ND |
| 2017-02-15 | 5810-004-0920 | ND |
| 2018-01-11 | 5810-019-1232 | ND |
| 2018-01-11 | 5810-024-1232 | ND |
| 2019-03-25 | 5810-001-1015 | ND |
| 2019-03-25 | 5810-003-1050 | ND |
| 2019-03-25 | 5810-005-0950 | ND |