2,4,5-TP (Silvex)
City of Petaluma
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 6 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 5 | 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 |
|---|---|---|
| 2015-03-19 | 1610-057-1400 | ND |
| 2015-06-18 | 1610-009-0915 | ND |
| 2015-06-18 | 1610-031-1300 | ND |
| 2015-09-23 | 1610-032-1120 | ND |
| 2016-03-09 | 1610-026-1045 | ND |
| 2016-03-09 | 1610-027-1105 | ND |
| 2016-05-03 | 1610-012-0945 | ND |
| 2016-06-22 | 1610-028-1100 | ND |
| 2016-09-22 | 1610-051-1120 | ND |
| 2016-12-07 | 1644-055-1220 | ND |
| 2018-06-06 | 1644-009-0830 | ND |
| 2018-06-06 | 1644-031-1020 | ND |
| 2018-06-06 | 1644-030-1150 | ND |
| 2018-06-06 | 1644-010-0845 | ND |
| 2018-11-07 | 1644-032-1030 | ND |
| 2018-11-07 | 1644-057-1025 | ND |
| 2019-03-13 | 1644-027-0910 | ND |
| 2019-03-13 | 1644-026-1008 | ND |
| 2019-03-13 | 1644-051-1058 | ND |
| 2019-03-13 | 1644-012-0844 | ND |
| 2019-03-13 | 1644-055-1108 | ND |