Diquat
Horsham Water&sewer Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 24 | 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 |
|---|---|---|
| 2023-02-08 | 28520594.00 | ND |
| 2023-02-08 | 28520525.00 | ND |
| 2023-02-15 | 28520571.00 | ND |
| 2023-02-15 | 28520548.00 | ND |
| 2023-03-01 | 28520620.00 | ND |
| 2023-03-01 | 28520648.00 | ND |
| 2023-04-18 | 28899758.00 | ND |
| 2023-04-18 | 28899629.00 | ND |
| 2023-04-18 | 28900331.00 | ND |
| 2023-04-18 | 28899702.00 | ND |
| 2023-04-18 | 29107837.00 | ND |
| 2023-04-18 | 28899730.00 | ND |
| 2023-07-20 | 29496809.00 | ND |
| 2023-07-27 | 29496867.00 | ND |
| 2023-07-27 | 29496895.00 | ND |
| 2023-08-10 | 29699518.00 | ND |
| 2023-08-10 | 29699490.00 | ND |
| 2023-08-24 | 29496864.00 | ND |
| 2023-10-26 | 30071330.00 | ND |
| 2023-10-26 | 30071302.00 | ND |
| 2023-10-26 | 30070795.00 | ND |
| 2023-10-26 | 30071386.00 | ND |
| 2023-10-26 | 30070823.00 | ND |
| 2023-10-26 | 30071358.00 | ND |