2,4,5-TP (Silvex)
City of Spokane
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.
20
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 | ND | 5 | 0 | ND |
| 2015 | ND | 8 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 7 | 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 |
|---|---|---|
| 2014-07-29 | 00947 | ND |
| 2014-07-29 | 00946 | ND |
| 2014-07-29 | 00945 | ND |
| 2014-10-28 | 54250 | ND |
| 2014-12-02 | 55190 | ND |
| 2015-04-28 | 59499 | ND |
| 2015-07-28 | 63239 | ND |
| 2015-07-28 | 63246 | ND |
| 2015-07-28 | 63258 | ND |
| 2015-07-28 | 63244 | ND |
| 2015-10-27 | 67368 | ND |
| 2015-10-27 | 67367 | ND |
| 2015-10-27 | 67369 | ND |
| 2018-07-17 | ND | |
| 2018-07-17 | ND | |
| 2018-07-17 | ND | |
| 2018-07-17 | ND | |
| 2018-10-30 | ND | |
| 2018-10-30 | ND | |
| 2018-10-30 | ND |