2,4,5-TP (Silvex)
City of Billings
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.
10
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-02-10 | B14020492-001D | ND |
| 2014-08-11 | B14081054-001A | ND |
| 2017-02-08 | B17020497-002A | ND |
| 2017-05-08 | B17051019-001A | ND |
| 2017-08-07 | B17081099-001A | ND |
| 2018-02-05 | B18020545-001D | ND |
| 2018-05-07 | B18051134-001D | ND |
| 2018-08-06 | B18080949-001D | ND |
| 2018-08-06 | B18080949-002C | ND |
| 2019-02-11 | B19020608-001D | ND |