Diquat
Monroe Water System
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 | 2 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-07-30 | 35407880001 | ND |
| 2018-07-30 | 35407880001 | ND |
| 2019-01-14 | 35442603001 | ND |
| 2019-01-14 | 35442603001 | ND |
| 2019-07-31 | 35486743001 | ND |
| 2019-07-31 | 35486743001 | ND |
| 2020-01-06 | 35523114001 | ND |
| 2020-07-16 | 35564002001 | ND |
| 2021-02-02 | 35608834002 | ND |
| 2021-09-23 | 35666240001 | ND |
| 2022-01-18 | 35692112001 | ND |
| 2022-08-15 | 35741176001 | ND |
| 2023-02-06 | 35778177001 | ND |
| 2023-07-18 | 35814092001 | ND |