Diquat
Warminster Municipal Authority
NOTE: Warminster Municipal Authority purchases water from North Wales Water Authority which is required to test for diquat. Sample information shown below was taken by North Wales Water Authority.
Diquat is a herbicide used on potato crops and aquatic weeds.
Samples
Samples exceeding legal limit (MCL)
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 | 11 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 4 | 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
NOTE: Warminster Municipal Authority purchases water from North Wales Water Authority which is required to test for diquat. Sample information shown below was taken by North Wales Water Authority.
| Date | Lab ID | Result |
|---|---|---|
| 2020-04-01 | 22025478.00 | ND |
| 2020-04-20 | 22026083.00 | ND |
| 2020-04-20 | 22026173.00 | ND |
| 2020-04-20 | 22026113.00 | ND |
| 2020-04-20 | 22026143.00 | ND |
| 2020-04-27 | 22217305.00 | ND |
| 2020-04-27 | 22217275.00 | ND |
| 2020-04-27 | 22217335.00 | ND |
| 2020-04-27 | 22217394.00 | ND |
| 2020-04-27 | 22217365.00 | ND |
| 2020-07-06 | 22609701.00 | ND |
| 2020-07-27 | 22801142.00 | ND |
| 2020-07-27 | 22801169.00 | ND |
| 2020-07-27 | 22801112.00 | ND |
| 2020-07-27 | 22801202.00 | ND |
| 2020-07-27 | 22801082.00 | ND |
| 2020-08-31 | 23001503.00 | ND |
| 2020-08-31 | 23001475.00 | ND |
| 2020-08-31 | 23001419.00 | ND |
| 2020-08-31 | 23001447.00 | ND |
| 2023-04-03 | 28704928.00 | ND |
| 2023-04-03 | 28704927.00 | ND |
| 2023-04-03 | 28704931.00 | ND |
| 2023-04-03 | 28704930.00 | ND |
| 2023-04-03 | 28704929.00 | ND |
| 2023-04-04 | 28704932.00 | ND |
| 2023-06-05 | 29110379.00 | ND |
| 2023-07-10 | 29304293.00 | ND |
| 2023-07-10 | 29304292.00 | ND |
| 2023-07-10 | 29304290.00 | ND |
| 2023-07-10 | 29304289.00 | ND |
| 2023-07-11 | 29304294.00 | ND |
| 2023-07-11 | 29304291.00 | ND |
| 2023-07-11 | 29304295.00 | ND |