2,4,5-TP (Silvex)
SJWD Middle Tyger WTP
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.
17
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 | ND | 1 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 7 | 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 |
|---|---|---|
| 2014-05-13 | AD39842 | ND |
| 2014-05-13 | AD39799 | ND |
| 2015-05-05 | AD54896 | ND |
| 2016-06-15 | AD77332 | ND |
| 2016-12-13 | AD87058 | ND |
| 2017-04-26 | AD93225 | ND |
| 2017-06-15 | AD96073 | ND |
| 2018-05-02 | AE11609 | ND |
| 2018-06-20 | AE14002 | ND |
| 2018-12-12 | AE22907 | ND |
| 2019-03-05 | AE26704 | ND |
| 2019-03-05 | AE26705 | ND |
| 2019-05-16 | AE30554 | ND |
| 2019-06-19 | AE32288 | ND |
| 2019-08-27 | AE36139 | ND |
| 2019-08-27 | AE36137 | ND |
| 2019-11-13 | AE40151 | ND |