Diquat
Warrenville
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 10 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 10 | 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 |
|---|---|---|
| 2015-07-15 | 1507D84-006A | ND |
| 2015-07-15 | 1507D84-009A | ND |
| 2015-07-15 | 1507D84-012A | ND |
| 2015-07-15 | 1507D84-015A | ND |
| 2015-07-15 | 1507D84-003A | ND |
| 2015-11-17 | 1511D25-003A | ND |
| 2015-11-17 | 1511D25-006A | ND |
| 2015-11-17 | 1511D25-009A | ND |
| 2015-11-17 | 1511D25-012A | ND |
| 2015-11-17 | 1511D25-015A | ND |
| 2018-08-20 | 1808H15-015A | ND |
| 2018-08-20 | 1808H15-012A | ND |
| 2018-08-20 | 1808H15-009A | ND |
| 2018-08-20 | 1808H15-006A | ND |
| 2018-08-20 | 1808H15-003A | ND |
| 2018-11-28 | 1811H65-005A | ND |
| 2018-11-28 | 1811H65-004A | ND |
| 2018-11-28 | 1811H65-003A | ND |
| 2018-11-28 | 1811H65-002A | ND |
| 2018-11-28 | 1811H65-001A | ND |