Diquat
Collegeville Trappe Joint Public Works Department
Diquat is a herbicide used on potato crops and aquatic weeds.
40
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 |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 20 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 20 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2020-05-04 | 22213259.00 | ND |
| 2020-05-04 | 22213229.00 | ND |
| 2020-05-04 | 22213289.00 | ND |
| 2020-05-18 | 22213526.00 | ND |
| 2020-05-18 | 22213495.00 | ND |
| 2020-05-18 | 22213556.00 | ND |
| 2020-05-18 | 22213465.00 | ND |
| 2020-06-08 | 22414081.00 | ND |
| 2020-06-08 | 22414141.00 | ND |
| 2020-06-08 | 22414111.00 | ND |
| 2020-08-03 | 22797485.00 | ND |
| 2020-08-03 | 22797261.00 | ND |
| 2020-08-03 | 22797350.00 | ND |
| 2020-08-03 | 22797290.00 | ND |
| 2020-08-03 | 22797320.00 | ND |
| 2020-08-17 | 22797866.00 | ND |
| 2020-08-17 | 22797837.00 | ND |
| 2020-08-17 | 22797808.00 | ND |
| 2020-08-17 | 22797778.00 | ND |
| 2020-08-17 | 22797749.00 | ND |
| 2023-04-17 | 28700780.00 | ND |
| 2023-04-17 | 28700777.00 | ND |
| 2023-04-17 | 28700782.00 | ND |
| 2023-04-17 | 28700781.00 | ND |
| 2023-04-17 | 28700779.00 | ND |
| 2023-04-17 | 28700778.00 | ND |
| 2023-05-01 | 28898904.00 | ND |
| 2023-05-01 | 28898903.00 | ND |
| 2023-05-01 | 28898902.00 | ND |
| 2023-05-01 | 28898905.00 | ND |
| 2023-07-24 | 29495684.00 | ND |
| 2023-07-24 | 29495686.00 | ND |
| 2023-07-24 | 29495685.00 | ND |
| 2023-07-24 | 29495692.00 | ND |
| 2023-07-24 | 29495691.00 | ND |
| 2023-07-24 | 29495683.00 | ND |
| 2023-08-07 | 29495689.00 | ND |
| 2023-08-07 | 29495687.00 | ND |
| 2023-08-07 | 29495690.00 | ND |
| 2023-08-07 | 29495688.00 | ND |