2,4,5-TP (Silvex)
Virgin Valley Water District
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 | ND | 1 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 8 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 9 | 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 |
|---|---|---|
| 2014-07-16 | 201407180115 | ND |
| 2016-06-15 | 201606160668 | ND |
| 2016-06-15 | 201606160669 | ND |
| 2016-06-15 | 201606160670 | ND |
| 2016-06-15 | 201606160667 | ND |
| 2016-07-20 | 201607250053 | ND |
| 2016-07-20 | 201607250054 | ND |
| 2016-07-20 | 201607250056 | ND |
| 2016-07-20 | 201607250051 | ND |
| 2018-09-19 | 201809210134 | ND |
| 2019-06-19 | 201906210354 | ND |
| 2019-06-19 | 201906210355 | ND |
| 2019-07-01 | 201907030618 | ND |
| 2019-07-01 | 201907030625 | ND |
| 2019-07-17 | 201907190472 | ND |
| 2019-07-17 | 201907190473 | ND |
| 2019-09-25 | 201909270336 | ND |
| 2019-12-04 | 201912060695 | ND |
| 2019-12-18 | 201912190652 | ND |