Diquat
Aqua Pa Uwchlan
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 23 | 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 |
|---|---|---|
| 2022-08-03 | 27224172.00 | ND |
| 2022-11-29 | 27814145.00 | ND |
| 2023-02-07 | 28340604.00 | ND |
| 2023-02-07 | 28340544.00 | ND |
| 2023-02-07 | 28340574.00 | ND |
| 2023-02-07 | 28340664.00 | ND |
| 2023-02-07 | 28340634.00 | ND |
| 2023-02-14 | 28340901.00 | ND |
| 2023-04-17 | 28692531.00 | ND |
| 2023-04-20 | 28692465.00 | ND |
| 2023-04-20 | 28692495.00 | ND |
| 2023-04-20 | 28692435.00 | ND |
| 2023-04-26 | 28692561.00 | ND |
| 2023-04-26 | 28692591.00 | ND |
| 2023-07-11 | 29487114.00 | ND |
| 2023-07-11 | 29487167.00 | ND |
| 2023-07-17 | 29487199.00 | ND |
| 2023-07-17 | 29487142.00 | ND |
| 2023-07-17 | 29487227.00 | ND |
| 2023-07-17 | 29487255.00 | ND |
| 2023-10-16 | 30062491.00 | ND |
| 2023-10-16 | 30062435.00 | ND |
| 2023-10-16 | 30062463.00 | ND |
| 2023-10-18 | 30062407.00 | ND |
| 2023-10-18 | 30062376.00 | ND |