2,4,5-TP (Silvex)
Chowan County Water System
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.
13
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-05-21 | 8045-052114-E01S | ND |
| 2014-07-09 | 8045-070914-E01S | ND |
| 2015-04-15 | ND | |
| 2016-04-13 | 8045-041316-E01S | ND |
| 2017-04-05 | 8045-040517-E01S | ND |
| 2017-08-16 | 8045-081617-E01S | ND |
| 2018-04-11 | 8045-041118-E01S | ND |
| 2018-09-19 | 8045-091918-E01S | ND |
| 2018-10-24 | 8045-102418-E01S | ND |
| 2019-01-16 | 8045-011619-E01S | ND |
| 2019-05-29 | 8045-052919-E01S | ND |
| 2019-07-17 | 8045-071719-E01S | ND |
| 2019-10-09 | 8045-100919-E01S | ND |