Diquat
St Charles
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 11 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 9 | 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 |
|---|---|---|
| 2015-08-18 | 1508E43-006A | ND |
| 2015-08-18 | 1508E43-009A | ND |
| 2015-08-18 | 1508E43-012A | ND |
| 2015-08-18 | 1508E43-015A | ND |
| 2015-08-18 | 1508E43-018A | ND |
| 2015-08-18 | 1508E43-003A | ND |
| 2015-11-18 | 1511E63-002A | ND |
| 2015-11-18 | 1511E63-004A | ND |
| 2015-11-18 | 1511E63-006A | ND |
| 2015-11-18 | 1511E63-008A | ND |
| 2015-11-19 | 1511E82-003A | ND |
| 2016-09-28 | 6094696-01 | ND |
| 2018-08-09 | 8081943-05 | ND |
| 2018-08-09 | 8081943-04 | ND |
| 2018-08-09 | 8081943-01 | ND |
| 2018-10-30 | 8105673-01 | ND |
| 2018-10-30 | 8105673-03 | ND |
| 2018-10-30 | 8105673-05 | ND |
| 2018-10-30 | 8105673-07 | ND |
| 2018-10-30 | 8105673-09 | ND |
| 2018-11-05 | 8110572-01 | ND |
| 2019-09-04 | 9090566-05 | ND |
| 2019-09-04 | 9090566-03 | ND |
| 2019-09-04 | 9090566-01 | ND |