2,4,5-TP (Silvex)
Altoona Water Authority
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 | ND | 12 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2020-05-18 | 22286944.00 | ND |
| 2020-05-18 | 22286917.00 | ND |
| 2020-05-18 | 22286971.00 | ND |
| 2020-05-21 | 22483946.00 | ND |
| 2020-05-21 | 22484000.00 | ND |
| 2020-05-21 | 22483972.00 | ND |
| 2020-07-15 | 22676327.00 | ND |
| 2020-07-15 | 22676354.00 | ND |
| 2020-07-15 | 22676160.00 | ND |
| 2020-07-16 | 22869601.00 | ND |
| 2020-07-16 | 22676408.00 | ND |
| 2020-07-16 | 22676381.00 | ND |
| 2023-04-27 | 28974661.00 | ND |
| 2023-04-27 | 28974641.00 | ND |
| 2023-05-03 | 28974790.00 | ND |
| 2023-05-03 | 28974757.00 | ND |
| 2023-05-04 | 28974702.00 | ND |
| 2023-08-02 | 29372122.00 | ND |
| 2023-08-02 | 29372128.00 | ND |
| 2023-08-03 | 29571040.00 | ND |
| 2023-08-03 | 29571046.00 | ND |
| 2023-08-10 | 29571099.00 | ND |