Diquat
Houma Water Treatment Service Area
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 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2019-02-18 | 35449356001 | ND |
| 2019-02-18 | 35449356001 | ND |
| 2019-08-28 | 35494058001 | ND |
| 2019-08-28 | 35494058001 | ND |
| 2020-01-22 | 35526020001 | ND |
| 2020-12-03 | 35596462001 | ND |
| 2021-03-11 | 35619288001 | ND |
| 2021-11-04 | 35675777001 | ND |
| 2022-03-02 | 35701433001 | ND |
| 2022-10-12 | 35753132001 | ND |
| 2023-03-27 | 35789301001 | ND |
| 2023-12-14 | 35848535001 | ND |