2,4,5-TP (Silvex)
Chester Metro
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.
18
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 | 4 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-03-19 | AD37321 | ND |
| 2014-05-22 | AD40277 | ND |
| 2014-07-02 | AD42008 | ND |
| 2014-12-10 | AD49189 | ND |
| 2015-03-19 | AD53201 | ND |
| 2016-02-11 | AD70602 | ND |
| 2017-01-17 | AD88371 | ND |
| 2017-05-31 | AD95074 | ND |
| 2017-07-10 | AD96985 | ND |
| 2017-10-02 | AE01287 | ND |
| 2018-02-20 | AE07960 | ND |
| 2018-06-12 | AE13527 | ND |
| 2018-08-13 | AE16563 | ND |
| 2018-10-08 | AE19334 | ND |
| 2019-01-22 | AE24388 | ND |
| 2019-04-02 | AE28110 | ND |
| 2019-07-02 | AE33058 | ND |
| 2019-10-02 | AE38147 | ND |