2,4,5-TP (Silvex)
City of Troutdale
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.
28
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 | 14 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 14 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-07-23 | 40723422-S | ND |
| 2014-07-23 | 40723423-S | ND |
| 2014-07-23 | 40723425-S | ND |
| 2014-07-23 | 40723426-S | ND |
| 2014-07-23 | 40723427-S | ND |
| 2014-07-23 | 40723424-S | ND |
| 2014-07-23 | 40723421-S | ND |
| 2014-10-15 | 41015323-S | ND |
| 2014-10-15 | 41015324-S | ND |
| 2014-10-15 | 41015327-S | ND |
| 2014-10-15 | 41015326-S | ND |
| 2014-10-15 | 41015325-S | ND |
| 2014-10-15 | 41015322-S | ND |
| 2014-10-15 | 41015321-S | ND |
| 2017-08-09 | 70809251-S | ND |
| 2017-08-09 | 70809255-S | ND |
| 2017-08-09 | 70809258-S | ND |
| 2017-08-09 | 70809257-S | ND |
| 2017-08-09 | 70809256-S | ND |
| 2017-08-09 | 70809253-S | ND |
| 2017-08-09 | 70809252-S | ND |
| 2017-12-06 | 71206501-S | ND |
| 2017-12-06 | 71206502-S | ND |
| 2017-12-06 | 71206504-S | ND |
| 2017-12-06 | 71206503-S | ND |
| 2017-12-12 | 71212341-S | ND |
| 2017-12-12 | 71212342-S | ND |
| 2017-12-12 | 71212343-S | ND |