2,4,5-TP (Silvex)
Paw Penn District
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 16 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 14 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 2 | 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 |
---|---|---|
2014-04-01 | 25337701 | ND |
2014-04-01 | 25337901 | ND |
2014-04-02 | 25337201 | ND |
2014-04-02 | 25338601 | ND |
2014-04-02 | 25337501 | ND |
2014-04-04 | 25337101 | ND |
2014-04-04 | 25338401 | ND |
2014-04-04 | 25338101 | ND |
2014-07-07 | 26114201 | ND |
2014-07-07 | 26113001 | ND |
2014-07-07 | 26113501 | ND |
2014-07-09 | 26113701 | ND |
2014-07-09 | 26114001 | ND |
2014-07-09 | 26113301 | ND |
2014-07-09 | 26113101 | ND |
2014-09-04 | 26113901 | ND |
2017-04-03 | 15975914 | ND |
2017-04-03 | 15975883 | ND |
2017-04-03 | 15975852 | ND |
2017-04-03 | 15975823 | ND |
2017-04-03 | 15975792 | ND |
2017-04-03 | 15975945 | ND |
2017-04-03 | 15975763 | ND |
2017-07-06 | 16450240 | ND |
2017-07-06 | 16450269 | ND |
2017-07-06 | 16450300 | ND |
2017-07-06 | 16450362 | ND |
2017-07-11 | 16450182 | ND |
2017-07-11 | 16450331 | ND |
2017-07-11 | 16450211 | ND |
2019-07-15 | 45716201 | ND |
2019-10-31 | 43999701 | ND |