2,4,5-TP (Silvex)
City of Westminster
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-07-14 | 0060015_05_00014 | ND |
| 2014-07-14 | 0060015_06_00014 | ND |
| 2014-07-14 | 0060015_07_00014 | ND |
| 2014-07-14 | 0060015_08_00014 | ND |
| 2014-07-14 | 0060015_01_00014 | ND |
| 2015-08-26 | E16000776001 | ND |
| 2015-08-26 | 0324AU2615 | ND |
| 2016-05-23 | E16004418002 | ND |
| 2016-09-08 | E17001059002 | ND |
| 2016-09-08 | E17001059005 | ND |
| 2016-09-08 | E17001059013 | ND |
| 2017-01-31 | E17002940005 | ND |
| 2017-01-31 | E17002940007 | ND |
| 2017-01-31 | E17002940009 | ND |
| 2017-05-31 | E17004691001 | ND |
| 2018-02-27 | 120150 | ND |
| 2018-05-14 | E18004109001 | ND |
| 2018-09-11 | E19000887001 | ND |