2,4,5-TP (Silvex)
Brunswick / Topsham Water District
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 | 6 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2020-10-21 | 2010-02991-003 | ND |
| 2020-10-21 | 2010-02991-002 | ND |
| 2020-10-21 | 2010-02991-001 | ND |
| 2020-12-09 | 2012-01306-003 | ND |
| 2020-12-09 | 2012-01306-002 | ND |
| 2020-12-09 | 2012-01306-001 | ND |
| 2022-07-21 | 402201615-TQ1 | ND |
| 2023-06-20 | 2306-04108-001 | ND |
| 2023-06-20 | 2306-04106-001 | ND |
| 2023-06-20 | 2306-04100-001 | ND |
| 2023-11-15 | 2311-02949-001 | ND |
| 2023-11-15 | 2311-02947-001 | ND |
| 2023-11-15 | 2311-02946-001 | ND |