Diquat
American Falls, City of
Diquat is a herbicide used on potato crops and aquatic weeds.
15
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 | 2 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 9 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2019-05-07 | SI90505901 | ND |
| 2019-10-01 | SI91001401 | ND |
| 2020-02-19 | SI00210601 | ND |
| 2020-02-19 | SI00210602 | ND |
| 2020-03-03 | SI00301801 | ND |
| 2020-05-12 | SI00508701 | ND |
| 2022-06-20 | SI20630201 | ND |
| 2022-07-05 | SI20701501 | ND |
| 2022-08-25 | SI20831002 | ND |
| 2022-09-06 | SI20903201 | ND |
| 2022-09-06 | SI20903202 | ND |
| 2022-09-12 | SI20910201 | ND |
| 2022-09-14 | SI20914701 | ND |
| 2022-10-17 | SI21015801 | ND |
| 2022-10-24 | SI21023001 | ND |