Diquat
Bellefonte Borough Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
18
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-06-11 | 14061493-01 | ND |
| 2014-08-21 | 14082551-01 | ND |
| 2015-06-30 | 12935784 | ND |
| 2016-03-16 | 14031421 | ND |
| 2016-06-15 | 14470316 | ND |
| 2016-08-25 | 14974537 | ND |
| 2016-11-17 | 15428392 | ND |
| 2017-02-22 | 15849412 | ND |
| 2017-05-16 | 16319938 | ND |
| 2017-05-16 | 16319912 | ND |
| 2017-08-17 | 16628638 | ND |
| 2017-08-17 | 16628612 | ND |
| 2018-03-19 | 680-150273-1 | ND |
| 2018-05-23 | 680-153034-1 | ND |
| 2019-05-20 | 9016978-01 | ND |
| 2019-06-18 | 9021220-01 | ND |
| 2019-08-21 | 9029792-01 | ND |
| 2019-11-19 | 9041075-01 | ND |