2,4,5-TP (Silvex)
Loudoun Water - Central System
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.
10
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-05-15 | 92201785002CAH | ND |
| 2014-07-23 | 92210765001_CAH | ND |
| 2017-05-16 | 3697671_SOCHERB | ND |
| 2017-08-15 | 3760315 | ND |
| 2018-08-13 | 92395631003_CAH | ND |
| 2018-10-17 | 92403946001_CAH | ND |
| 2019-01-15 | 92414268002_CAH | ND |
| 2019-05-22 | 92430330001_CAH | ND |
| 2019-08-27 | 92443218004_CAH | ND |
| 2019-10-15 | 92450083001_CAH | ND |