2,4,5-TP (Silvex)
Harford County Department of Public Works
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.
15
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 | 3 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-07-22 | 0120016_01_00029 | ND |
| 2014-07-22 | 0120016_03_00029 | ND |
| 2014-10-20 | 0120016_02_00148 | ND |
| 2015-10-19 | E16001689007 | ND |
| 2015-10-19 | E16001689009 | ND |
| 2016-05-09 | E16004258004 | ND |
| 2016-05-09 | E16004258006 | ND |
| 2016-05-09 | E16004258002 | ND |
| 2017-04-19 | E17004140001 | ND |
| 2017-04-19 | E17004139001 | ND |
| 2017-06-19 | E17005021001 | ND |
| 2018-06-04 | E18004355009 | ND |
| 2018-06-04 | E18004355007 | ND |
| 2018-06-04 | E18004355011 | ND |
| 2019-07-31 | E20000444001 | ND |