Diquat
Metropolitan Utilities District
Diquat is a herbicide used on potato crops and aquatic weeds.
22
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 | 6 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 10 | 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 |
|---|---|---|
| 2015-04-20 | 357043 | ND |
| 2015-04-20 | 357044 | ND |
| 2015-04-20 | 357045 | ND |
| 2015-07-14 | 375182 | ND |
| 2015-07-14 | 375183 | ND |
| 2015-07-14 | 375181 | ND |
| 2018-04-24 | 546101 | ND |
| 2018-04-24 | 546100 | ND |
| 2018-04-24 | 546099 | ND |
| 2018-09-17 | 561297 | ND |
| 2018-09-17 | 561298 | ND |
| 2018-09-17 | 561299 | ND |
| 2019-05-01 | 605635 | ND |
| 2019-05-01 | 605636 | ND |
| 2019-06-10 | 605634 | ND |
| 2019-06-10 | 605637 | ND |
| 2019-06-10 | 605638 | ND |
| 2019-09-23 | 621604 | ND |
| 2019-09-23 | 621605 | ND |
| 2019-09-23 | 621603 | ND |
| 2019-09-23 | 621602 | ND |
| 2019-09-23 | 621601 | ND |