Diquat
Brodhead Creek Reg Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
10
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 | ND | 6 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-04-16 | 14042668-001 | ND |
| 2014-06-24 | 14062435-001 | ND |
| 2014-06-24 | 14062435-002 | ND |
| 2014-08-04 | 14080182-001 | ND |
| 2014-08-18 | 14081696-001 | ND |
| 2014-08-18 | 14081715-001 | ND |
| 2017-04-19 | 15956159 | ND |
| 2017-04-20 | 15956200 | ND |
| 2017-08-16 | 16585154 | ND |
| 2017-08-29 | 16585174 | ND |