Diquat
Hampshire
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 | ND | 4 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-03-07 | 1403301-003A | ND |
| 2014-06-11 | 1406676-003A | ND |
| 2015-03-04 | 1503337-003A | ND |
| 2015-06-03 | 1506282-003A | ND |
| 2015-08-04 | 1508355-003A | ND |
| 2015-12-02 | 1512167-003A | ND |
| 2018-02-07 | 1802439-003A | ND |
| 2018-08-15 | 8083010-01 | ND |
| 2018-10-03 | 8100932-01 | ND |
| 2019-10-02 | 9100630-01 | ND |
| 2019-11-13 | 9112257-01 | ND |
| 2019-11-21 | 9114054-01 | ND |