Diquat
Doylestown Borough Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
19
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 | ND | 10 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 9 | 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 |
|---|---|---|
| 2014-02-25 | L4943098-1 | ND |
| 2014-02-25 | L4943098-5 | ND |
| 2014-02-25 | L4943098-4 | ND |
| 2014-02-25 | L4943098-3 | ND |
| 2014-03-25 | L4943098-6 | ND |
| 2014-08-26 | L5114559-3 | ND |
| 2014-08-26 | L5114559-4 | ND |
| 2014-08-26 | L5114559-2 | ND |
| 2014-08-26 | L5114559-5 | ND |
| 2014-08-26 | L5114559-1 | ND |
| 2017-01-16 | 15782495 | ND |
| 2017-01-16 | 15503222 | ND |
| 2017-01-16 | 15782565 | ND |
| 2017-01-16 | 15503291 | ND |
| 2017-01-16 | 15782461 | ND |
| 2017-01-16 | 15503188 | ND |
| 2017-01-16 | 15782530 | ND |
| 2017-01-16 | 15503256 | ND |
| 2017-01-18 | 15503319 | ND |