2,4,5-TP (Silvex)
Walnut Grove Utilities
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.
21
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 3 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 13 | 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 |
|---|---|---|
| 2016-12-21 | 16122773-01A | ND |
| 2016-12-21 | 16122770-01A | ND |
| 2016-12-21 | 16122769-01A | ND |
| 2018-06-12 | 680-153971-1 | ND |
| 2018-06-13 | 680-154051-1 | ND |
| 2018-07-03 | 680-154927-1 | ND |
| 2018-07-10 | 680-155198-1 | ND |
| 2018-10-16 | 680-159419-1 | ND |
| 2019-02-26 | 680-165155-1 | ND |
| 2019-02-26 | 680-165150-1 | ND |
| 2019-03-05 | 680-165490-1 | ND |
| 2019-03-05 | 680-165488-1 | ND |
| 2019-03-12 | 680-165969-1 | ND |
| 2019-04-02 | 680-167063-1 | ND |
| 2019-04-02 | 680-167058-1 | ND |
| 2019-04-09 | 680-167502-1 | ND |
| 2019-04-09 | 680-167500-1 | ND |
| 2019-07-16 | 680-171850-1 | ND |
| 2019-07-16 | 680-171849-1 | ND |
| 2019-08-07 | 680-172766-1 | ND |
| 2019-08-07 | 680-172772-1 | ND |