Diquat
Erie City Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
14
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 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 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
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-08 | 3849224 | ND |
| 2018-05-21 | 3941484 | ND |
| 2018-08-21 | 4030515 | ND |
| 2019-05-21 | 4302822 | ND |
| 2019-09-10 | 4415506 | ND |
| 2019-11-18 | 4489102 | ND |
| 2020-04-01 | 22141721.00 | ND |
| 2020-05-18 | 22336497.00 | ND |
| 2020-08-26 | 22923665.00 | ND |
| 2020-09-23 | 23112736.00 | ND |
| 2023-04-04 | 28825998.00 | ND |
| 2023-04-18 | 28826400.00 | ND |
| 2023-08-09 | 29625435.00 | ND |
| 2023-09-14 | 29816652.00 | ND |