2,4,5-TP (Silvex)
Rehoboth 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.
27
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 | 11 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 12 | 0 | ND |
| 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 |
|---|---|---|
| 2014-04-23 | 35135573005 | ND |
| 2014-07-28 | 35147904006 | ND |
| 2015-05-20 | 35189675004 | ND |
| 2015-05-20 | 35189672006 | ND |
| 2015-05-20 | 35189670004 | ND |
| 2015-05-20 | 35189668002 | ND |
| 2015-08-10 | 35202984004 | ND |
| 2015-08-10 | 35202979005 | ND |
| 2015-08-26 | 35205121004 | ND |
| 2015-08-26 | 35205113004 | ND |
| 2015-08-26 | 35205112005 | ND |
| 2015-08-26 | 35205107004 | ND |
| 2015-10-20 | 35213069005 | ND |
| 2017-04-20 | 2224698006 | ND |
| 2017-08-28 | 2258555005 | ND |
| 2018-04-19 | 2310468001 | ND |
| 2018-04-19 | 2310461001 | ND |
| 2018-04-25 | 2311949003 | ND |
| 2018-04-25 | 2311946005 | ND |
| 2018-04-25 | 2311945002 | ND |
| 2018-06-07 | 2319770004 | ND |
| 2018-08-15 | 2333286004 | ND |
| 2018-08-15 | 2333278005 | ND |
| 2018-08-16 | 2333289002 | ND |
| 2018-08-16 | 2333279002 | ND |
| 2018-08-22 | 2334797004 | ND |
| 2018-08-22 | 2334798001 | ND |