2,4,5-TP (Silvex)
Horsham Water&sewer 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 | 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: 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 |
|---|---|---|
| 2023-02-08 | 28520605.00 | ND |
| 2023-02-08 | 28520536.00 | ND |
| 2023-02-15 | 28520582.00 | ND |
| 2023-02-15 | 28520559.00 | ND |
| 2023-03-01 | 28520635.00 | ND |
| 2023-03-01 | 28520663.00 | ND |
| 2023-04-18 | 28899773.00 | ND |
| 2023-04-18 | 28899644.00 | ND |
| 2023-04-18 | 28900346.00 | ND |
| 2023-04-18 | 29107852.00 | ND |
| 2023-04-18 | 28899717.00 | ND |
| 2023-04-18 | 28899745.00 | ND |
| 2023-07-20 | 29496847.00 | ND |
| 2023-07-20 | 29496820.00 | ND |
| 2023-07-27 | 29496878.00 | ND |
| 2023-07-27 | 29496906.00 | ND |
| 2023-08-10 | 29699533.00 | ND |
| 2023-08-10 | 29699505.00 | ND |
| 2023-10-26 | 30071317.00 | ND |
| 2023-10-26 | 30071345.00 | ND |
| 2023-10-26 | 30070810.00 | ND |
| 2023-10-26 | 30071401.00 | ND |
| 2023-10-26 | 30070838.00 | ND |
| 2023-10-26 | 30071373.00 | ND |