Diquat
Culvers Hill - North Webster
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 5 | 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 |
|---|---|---|
| 2015-06-10 | 15061506RS28-150 | ND |
| 2015-06-10 | 15061507RS28-150 | ND |
| 2015-06-10 | 15061508RS28-150 | ND |
| 2015-06-10 | 15061509RS28-150 | ND |
| 2015-06-10 | 15061504RS28-150 | ND |
| 2016-09-26 | 16092900001RS28- | ND |
| 2016-09-26 | 16092905001RS28- | ND |
| 2016-09-26 | 16092908001RS28- | ND |
| 2016-09-26 | 16092921001RS28- | ND |
| 2016-09-26 | 16092925001RS28- | ND |
| 2018-09-24 | 18093268RS28-180 | ND |
| 2018-09-24 | 18093267RS28-180 | ND |
| 2018-09-24 | 18093264RS28-180 | ND |
| 2018-09-24 | 18093262RS28-180 | ND |
| 2018-09-24 | 18093260RS28-180 | ND |
| 2019-08-20 | 380074RS28-1903 | ND |
| 2019-08-20 | 380074 | ND |
| 2019-08-20 | 380073RS28-1903 | ND |
| 2019-08-20 | 380073 | ND |
| 2019-11-21 | 384793RS28-1904 | ND |