2,4,5-TP (Silvex)
City of Frederick
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 | 3 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-05-01 | 0100015_01_00486 | ND |
| 2014-05-01 | 0100015_02_00486 | ND |
| 2014-06-23 | 0100015_03_00553 | ND |
| 2015-04-08 | E15003181001 | ND |
| 2015-04-08 | E15003181003 | ND |
| 2015-04-08 | E15003181005 | ND |
| 2016-04-25 | E16003991005 | ND |
| 2016-04-25 | E16003991002 | ND |
| 2016-04-25 | E16003984002 | ND |
| 2017-04-04 | E17003895003 | ND |
| 2017-04-04 | E17003895001 | ND |
| 2017-04-05 | E17003936001 | ND |
| 2018-05-09 | E18004037001 | ND |
| 2018-05-09 | E18004056001 | ND |