2,4,5-TP (Silvex)
South Island PSD
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.
23
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 | 12 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 11 | 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 |
|---|---|---|
| 2014-02-04 | AD35237 | ND |
| 2014-02-04 | AD35252 | ND |
| 2014-02-04 | AD35253 | ND |
| 2014-02-04 | AD35231 | ND |
| 2014-02-10 | AD35468 | ND |
| 2014-02-10 | AD35474 | ND |
| 2014-02-10 | AD35475 | ND |
| 2014-02-10 | AD35476 | ND |
| 2014-04-14 | AD38376 | ND |
| 2014-04-14 | AD38374 | ND |
| 2014-04-14 | AD38363 | ND |
| 2014-04-14 | AD38360 | ND |
| 2019-09-11 | AE36990 | ND |
| 2019-09-11 | AE37008 | ND |
| 2019-09-11 | AE37010 | ND |
| 2019-09-12 | AE37131 | ND |
| 2019-09-17 | AE37328 | ND |
| 2019-09-17 | AE37326 | ND |
| 2019-09-18 | AE37423 | ND |
| 2019-09-18 | AE37429 | ND |
| 2019-09-18 | AE37442 | ND |
| 2019-11-13 | AE40103 | ND |
| 2019-11-13 | AE40114 | ND |