2,4,5-TP (Silvex)
City of The Dalles
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.
19
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 8 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 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 |
|---|---|---|
| 2015-06-24 | 4401135963-S | ND |
| 2015-06-24 | 4401135961-S | ND |
| 2015-06-24 | 4401135962-S | ND |
| 2015-06-24 | 4401135964-S | ND |
| 2015-09-15 | 201509160736-S | ND |
| 2015-09-15 | 201509160735-S | ND |
| 2015-09-15 | 201509170002-S | ND |
| 2015-09-15 | 201509170003-S | ND |
| 2016-08-10 | 20168110690-S | ND |
| 2016-08-10 | 201608110689-S | ND |
| 2016-08-23 | 201608150029-S | ND |
| 2016-08-23 | 201608150030-S | ND |
| 2016-09-21 | 201609190134-S | ND |
| 2018-06-19 | V8F046801-S | ND |
| 2018-06-19 | V8F046802-S | ND |
| 2018-06-19 | V8F046803-S | ND |
| 2018-09-24 | V8I043301-S | ND |
| 2018-09-24 | V8I043302-S | ND |
| 2018-09-24 | V8I043303-S | ND |