Diquat
Philadelphia Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-04-07 | 201404100426 | ND |
| 2014-04-07 | 201404100425 | ND |
| 2014-04-07 | 201404100424 | ND |
| 2014-08-19 | 201408230072 | ND |
| 2014-08-19 | 201408230071 | ND |
| 2014-08-19 | 201408230073 | ND |
| 2015-06-10 | 12887854 | ND |
| 2015-06-10 | 12887848 | ND |
| 2015-06-10 | 12887842 | ND |
| 2016-06-03 | 14411721 | ND |
| 2016-06-03 | 14411771 | ND |
| 2016-06-03 | 14411746 | ND |
| 2017-05-16 | 16101000 | ND |
| 2017-05-16 | 16100975 | ND |
| 2017-05-16 | 16100950 | ND |
| 2017-07-24 | 16420613 | ND |
| 2017-07-24 | 16420588 | ND |
| 2017-07-24 | 16420638 | ND |
| 2018-06-11 | 8062833-01 | ND |
| 2018-06-11 | 8062834-01 | ND |
| 2018-06-11 | 8062835-01 | ND |
| 2019-06-25 | 9065260-01 | ND |
| 2019-06-25 | 9065261-01 | ND |
| 2019-06-25 | 9065259-01 | ND |