Diquat
Eunice Water System (LAWCO)
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 | ND | 2 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2018-09-24 | 35420588001 | ND |
| 2018-09-24 | 35420588001 | ND |
| 2019-04-22 | 35464160002 | ND |
| 2019-04-22 | 35464160003 | ND |
| 2019-04-22 | 35464160001 | ND |
| 2019-04-22 | 35464160002 | ND |
| 2019-04-22 | 35464160003 | ND |
| 2019-04-22 | 35464160001 | ND |
| 2021-04-19 | 35627657002 | ND |
| 2021-04-19 | 35627657001 | ND |
| 2022-03-21 | 35705902001 | ND |
| 2022-03-21 | 35705902002 | ND |
| 2023-02-27 | 35782726001 | ND |
| 2023-06-26 | 35809403001 | ND |
| 2023-09-11 | 35827498001 | ND |
| 2023-11-13 | 35841897001 | ND |
| 2023-11-13 | 35841897002 | ND |
| 2023-11-13 | 35841897003 | ND |