2,4,5-TP (Silvex)
Pennichuck Water Works
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.
12
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 | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 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 |
|---|---|---|
| 2014-08-07 | 1408-00209-001 | ND |
| 2014-09-22 | 1409-01462-001 | ND |
| 2015-07-09 | 1507-00785-001 | ND |
| 2015-09-16 | 1509-01283-001 | ND |
| 2016-07-18 | 1607-01775-001 | ND |
| 2016-09-07 | 1609-00702-001 | ND |
| 2017-07-20 | 1707-02339-001 | ND |
| 2017-09-06 | 1709-00604-001 | ND |
| 2018-07-12 | 1807-01399-001 | ND |
| 2018-09-05 | 1809-00481-001 | ND |
| 2019-07-17 | 1907-02588-001 | ND |
| 2019-08-27 | 1908-03724-001 | ND |