2,4,5-TP (Silvex)
Holbrook, City of
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 |
|---|---|---|---|---|
| 2014 | ND | 1 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-12-07 | 201412080061S | ND |
| 2015-03-10 | 201503110580S | ND |
| 2015-06-17 | 201506180456S | ND |
| 2015-09-02 | 201509040007S | ND |
| 2016-04-19 | 201604210073S | ND |
| 2016-08-22 | 201608230105S | ND |
| 2018-02-19 | 201802200172SA | ND |
| 2018-02-19 | 201802200172SB | ND |
| 2018-08-13 | 201808140104SA | ND |
| 2018-08-13 | 201808140104SB | ND |