2,4,5-TP (Silvex)
Big Bend 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.
14
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 | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | 0.200 ppb | 1 | 1 | 0.200 ppb |
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 |
|---|---|---|
| 2014-02-25 | 14020370-001 | ND |
| 2014-08-12 | 14080164-001 | ND |
| 2015-02-10 | 15020137-001 | ND |
| 2015-08-25 | 15080452-001 | ND |
| 2016-02-09 | 16020138-001 | ND |
| 2016-08-09 | S1603941002 | ND |
| 2016-08-09 | S1603941001 | ND |
| 2017-02-21 | S1701130002 | ND |
| 2017-02-21 | S1701130001 | ND |
| 2017-08-07 | S1701362002 | ND |
| 2017-08-07 | S1701362001 | ND |
| 2018-02-06 | S1705619001 | ND |
| 2018-08-16 | S1801116001 | ND |
| 2019-02-20 | S1806208001 | 0.200 ppb |