Diquat
Sunrise Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
18
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 | 10 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 8 | 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 |
|---|---|---|
| 2020-08-24 | 2055477-S | ND |
| 2020-08-24 | 2055480-S | ND |
| 2020-08-24 | 2055475-S | ND |
| 2020-08-25 | 2056018-S | ND |
| 2020-08-25 | 2056015-S | ND |
| 2020-11-10 | 2076510-S | ND |
| 2020-11-10 | 2076541-S | ND |
| 2020-11-10 | 2076508-S | ND |
| 2020-11-10 | 2076542-S | ND |
| 2020-11-10 | 2076506-S | ND |
| 2023-07-31 | 3212011-01-S | ND |
| 2023-07-31 | 3212011-02-S | ND |
| 2023-08-02 | 3214027-01-S | ND |
| 2023-08-02 | 3214027-02-S | ND |
| 2023-10-31 | 3304008-03-S | ND |
| 2023-10-31 | 3304008-04-S | ND |
| 2023-10-31 | 3304008-01-S | ND |
| 2023-10-31 | 3304008-02-S | ND |