Diquat
Collegeville Trappe Joint Public Works Department
Diquat is a herbicide used on potato crops and aquatic weeds.
28
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 | 14 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 14 | 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 |
|---|---|---|
| 2014-05-05 | 14041898-01 | ND |
| 2014-05-05 | 14041904-01 | ND |
| 2014-05-05 | 14041903-01 | ND |
| 2014-05-05 | 14041902-01 | ND |
| 2014-05-05 | 14041901-01 | ND |
| 2014-05-05 | 14041900-01 | ND |
| 2014-05-05 | 14041899-01 | ND |
| 2014-07-21 | 14072520-001 | ND |
| 2014-07-21 | 14072517-001 | ND |
| 2014-07-21 | 14072515-001 | ND |
| 2014-08-04 | 14080380-001 | ND |
| 2014-08-04 | 14080381-001 | ND |
| 2014-08-04 | 14080382-001 | ND |
| 2014-08-04 | 14080383-001 | ND |
| 2017-05-01 | 16093077 | ND |
| 2017-05-01 | 16093049 | ND |
| 2017-05-01 | 16093021 | ND |
| 2017-05-01 | 16092993 | ND |
| 2017-05-01 | 16092965 | ND |
| 2017-05-01 | 16092937 | ND |
| 2017-05-01 | 16092909 | ND |
| 2017-08-01 | 16564142 | ND |
| 2017-08-01 | 16564172 | ND |
| 2017-08-01 | 16564202 | ND |
| 2017-08-01 | 16564112 | ND |
| 2017-08-01 | 16564232 | ND |
| 2017-08-01 | 16564259 | ND |
| 2017-08-01 | 16564080 | ND |