2,4,5-TP (Silvex)
Hemlock Farms (main)
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.
20
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 | 10 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 10 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-04-15 | 14041845-001 | ND |
| 2014-04-15 | 14041839-001 | ND |
| 2014-04-15 | 14041858-001 | ND |
| 2014-04-28 | 14050058-001 | ND |
| 2014-04-28 | 14050059-001 | ND |
| 2014-08-11 | 14081392-002 | ND |
| 2014-08-11 | 14081392-003 | ND |
| 2014-08-11 | 14081392-001 | ND |
| 2014-08-11 | 14081392-005 | ND |
| 2014-08-11 | 14081392-004 | ND |
| 2017-04-26 | 15961303 | ND |
| 2017-04-26 | 15961275 | ND |
| 2017-04-26 | 15961331 | ND |
| 2017-05-02 | 16119417 | ND |
| 2017-05-02 | 16119402 | ND |
| 2017-08-08 | 16590242 | ND |
| 2017-08-15 | 16590319 | ND |
| 2017-08-15 | 16590292 | ND |
| 2017-08-22 | 16590346 | ND |
| 2017-08-22 | 16590373 | ND |