Diquat
Ely Municipal Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | 1 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-07-19 | 201807240558 | ND |
| 2019-08-14 | 201908190150 | ND |
| 2019-09-26 | 201910010466 | ND |
| 2020-08-27 | 202009020451 | ND |
| 2021-11-04 | 202111100759 | ND |
| 2021-12-09 | 202112150655 | ND |
| 2022-05-12 | 380-1966-1 | ND |
| 2022-07-07 | 380-9979-1 | ND |
| 2022-08-25 | 810-36089-1 | ND |
| 2022-08-25 | 810-36089-2 | ND |
| 2023-05-10 | 380-47459-1 | ND |
| 2023-09-13 | 380-63507-1 | ND |