2,4,5-TP (Silvex)
Forrest City Waterworks
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2010 | ND | 4 | 0 | ND |
| 2011 | ND | 2 | 0 | ND |
| 2012 | N/A | 0 | 0 | N/A |
| 2013 | ND | 4 | 0 | ND |
| 2014 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
ppb = parts per billion.
State and national drinking water standards and health guidelines
Health Guideline 3 ppb
The 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.
ppb = parts per billion.
EPA Maximum Contaminant
Level (MCL) 50 ppb
The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.
ppb = parts per billion.
EPA Maximum Contaminant
Level Goal (MCLG)50.0 ppb
A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.
ppb = parts per billion.
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2010-07-28 | 10210006102 | ND |
| 2010-07-28 | 10210006202 | ND |
| 2010-11-16 | 10321000802 | ND |
| 2010-11-16 | 10321000902 | ND |
| 2011-05-25 | 11146008002 | ND |
| 2011-08-03 | 11216000102 | ND |
| 2013-08-27 | 13241000202 | ND |
| 2013-08-27 | 13241000302 | ND |
| 2013-11-05 | 13310000802 | ND |
| 2013-11-05 | 13310000902 | ND |
| 2014-04-23 | 14114013802 | ND |
| 2014-08-27 | 14240000602 | ND |