2,4,5-TP (Silvex)
Aqua Pa Uwchlan
2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.
Samples
Samples exceeding legal limit (MCL)
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 | ND | 2 | 0 | ND |
| 2023 | ND | 23 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 3 ppb
The EWG Health Guideline of 3 ppb for 2,4,5-TP 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 harm to internal organs.
EPA Maximum Contaminant
Level (MCL): 50 ppb
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2022-08-03 | 27224187.00 | ND |
| 2022-10-12 | 27632712.00 | ND |
| 2023-02-07 | 28340511.00 | ND |
| 2023-02-07 | 28340490.00 | ND |
| 2023-02-07 | 28340497.00 | ND |
| 2023-02-07 | 28340483.00 | ND |
| 2023-02-07 | 28340504.00 | ND |
| 2023-02-14 | 28340818.00 | ND |
| 2023-04-17 | 28692528.00 | ND |
| 2023-04-20 | 28889777.00 | ND |
| 2023-04-20 | 28889783.00 | ND |
| 2023-04-20 | 28692403.00 | ND |
| 2023-04-26 | 28889793.00 | ND |
| 2023-04-26 | 28889800.00 | ND |
| 2023-07-11 | 29487129.00 | ND |
| 2023-07-11 | 29487178.00 | ND |
| 2023-07-17 | 29487214.00 | ND |
| 2023-07-17 | 29487157.00 | ND |
| 2023-07-17 | 29487242.00 | ND |
| 2023-07-17 | 29487270.00 | ND |
| 2023-10-16 | 30062506.00 | ND |
| 2023-10-16 | 30062450.00 | ND |
| 2023-10-16 | 30062478.00 | ND |
| 2023-10-18 | 30062422.00 | ND |
| 2023-10-18 | 30062383.00 | ND |