2,4,5-TP (Silvex)
City of Durham
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.
35
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 | 8 | 0 | ND |
| 2015 | ND | 8 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2014-02-11 | C400985-02 | ND |
| 2014-02-11 | C400985-01 | ND |
| 2014-05-13 | C405352-01 | ND |
| 2014-05-13 | C405352-02 | ND |
| 2014-08-12 | C409624-01 | ND |
| 2014-08-12 | C409624-02 | ND |
| 2014-11-11 | C414065-01 | ND |
| 2014-11-11 | C414065-02 | ND |
| 2015-02-10 | ND | |
| 2015-02-10 | ND | |
| 2015-05-12 | ND | |
| 2015-05-12 | ND | |
| 2015-08-10 | ND | |
| 2015-08-10 | ND | |
| 2015-11-11 | ND | |
| 2015-11-11 | ND | |
| 2016-02-09 | CZ01067-02RE1 | ND |
| 2016-02-09 | CZ01067-01RE1 | ND |
| 2016-05-11 | CZ05501-01 | ND |
| 2016-08-09 | CZ10771-01 | ND |
| 2017-05-08 | CA06170-01 | ND |
| 2017-05-08 | CA06170-02 | ND |
| 2017-08-08 | CA11367-01 | ND |
| 2017-08-08 | CA11367-02 | ND |
| 2018-08-14 | CB11154-01 | ND |
| 2018-08-14 | CB08962-01 | ND |
| 2018-11-13 | CB16647-01 | ND |
| 2019-02-12 | CC01714-01 | ND |
| 2019-02-12 | CC01714-02 | ND |
| 2019-05-14 | CC06562-01 | ND |
| 2019-05-14 | CC06562-02 | ND |
| 2019-08-13 | CC12766-01 | ND |
| 2019-08-13 | CC12766-02 | ND |
| 2019-11-12 | CC18483-02 | ND |
| 2019-11-12 | CC18483-01 | ND |