2,4,5-TP (Silvex)
North Penn Water Authority
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.
56
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 | 24 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 28 | 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 |
|---|---|---|
| 2014-04-22 | 14030712-01 | ND |
| 2014-04-22 | 14040590-01 | ND |
| 2014-04-22 | 14040589-01 | ND |
| 2014-04-22 | 14030715-01 | ND |
| 2014-04-22 | 14030714-01 | ND |
| 2014-04-28 | 14040582-01 | ND |
| 2014-04-29 | 14030716-01 | ND |
| 2014-04-29 | 14030720-01 | ND |
| 2014-04-29 | 14030718-01 | ND |
| 2014-05-19 | 14041348-01 | ND |
| 2014-06-09 | 14060593-01 | ND |
| 2014-06-09 | 14060589-01 | ND |
| 2014-07-07 | 14070787-001 | ND |
| 2014-07-07 | 14070804-001 | ND |
| 2014-07-07 | 14070809-001 | ND |
| 2014-07-07 | 14070812-001 | ND |
| 2014-07-07 | 14070808-001 | ND |
| 2014-07-21 | 14072516-001 | ND |
| 2014-07-21 | 14072521-001 | ND |
| 2014-08-04 | 14080384-001 | ND |
| 2014-08-25 | 14082298-01 | ND |
| 2014-08-25 | 14082297-01 | ND |
| 2014-08-25 | 14082295-01 | ND |
| 2014-08-25 | 14082296-01 | ND |
| 2015-07-02 | 13013261 | ND |
| 2015-12-09 | 13633941 | ND |
| 2016-08-23 | 14907927 | ND |
| 2016-11-02 | 15226754 | ND |
| 2017-02-22 | 15795488 | ND |
| 2017-04-05 | 15937198 | ND |
| 2017-04-05 | 15937056 | ND |
| 2017-04-05 | 15937021 | ND |
| 2017-04-05 | 15937163 | ND |
| 2017-04-05 | 15937117 | ND |
| 2017-04-05 | 15936985 | ND |
| 2017-04-05 | 15937092 | ND |
| 2017-04-19 | 15937943 | ND |
| 2017-04-19 | 15937871 | ND |
| 2017-04-19 | 15938015 | ND |
| 2017-04-19 | 15938051 | ND |
| 2017-04-19 | 15937979 | ND |
| 2017-04-19 | 15937907 | ND |
| 2017-07-12 | 16414008 | ND |
| 2017-07-12 | 16414115 | ND |
| 2017-07-12 | 16413937 | ND |
| 2017-07-12 | 16413973 | ND |
| 2017-07-12 | 16414044 | ND |
| 2017-07-12 | 16413902 | ND |
| 2017-07-12 | 16414080 | ND |
| 2017-07-17 | 16414187 | ND |
| 2017-07-17 | 16414151 | ND |
| 2017-07-17 | 16414331 | ND |
| 2017-07-17 | 16414223 | ND |
| 2017-07-17 | 16414259 | ND |
| 2017-07-17 | 16414295 | ND |
| 2017-10-09 | 16880778 | ND |