Diquat
Butler County Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 8 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2016-01-14 | 160114061-4 | ND |
| 2016-01-14 | 160114061-2 | ND |
| 2016-01-14 | 160114061-3 | ND |
| 2016-01-14 | 160114061-1 | ND |
| 2016-04-11 | 160412001-4 | ND |
| 2016-04-11 | 160412001-3 | ND |
| 2016-04-11 | 160412001-1 | ND |
| 2016-04-11 | 160412001-2 | ND |
| 2019-01-17 | 19010517-001H | ND |
| 2019-01-17 | 19010517-002H | ND |
| 2019-05-30 | 20105982002_ISOC | ND |
| 2019-05-30 | 20105982001_ISOC | ND |
| 2019-06-20 | 20109311002 | ND |
| 2019-06-20 | 20109311001 | ND |
| 2019-07-11 | 20112547002_ISOC | ND |
| 2019-07-11 | 20112547001_ISOC | ND |