2,4,5-TP (Silvex)
Amicks Ferry Water System
NOTE: Amicks Ferry Water System purchases water from City of Columbia which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Columbia.
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 | ND | 2 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 2 | 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
NOTE: Amicks Ferry Water System purchases water from City of Columbia which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Columbia.
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-12 | AE09073 | ND |
| 2018-07-16 | AE15003 | ND |
| 2019-01-08 | AE23570 | ND |
| 2019-07-16 | AE33661 | ND |
| 2020-10-14 | AE55739 | ND |
| 2020-11-04 | AE56846 | ND |
| 2021-10-13 | AE73342 | ND |
| 2021-10-20 | AE73703 | ND |
| 2022-09-08 | 810-36781-1 | ND |
| 2023-09-06 | AF08032 | ND |
| 2023-09-21 | AF08856 | ND |