2,4,5-TP (Silvex)
City of Rohnert Park
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.
43
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 | ND | 10 | 0 | ND |
| 2016 | ND | 7 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | ND | 10 | 0 | ND |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2015-09-22 | 9590-001-1110 | ND |
| 2015-09-22 | 9590-002-1110 | ND |
| 2015-09-22 | 9590-004-1110 | ND |
| 2015-09-22 | 9590-040-1053 | ND |
| 2015-09-22 | 9590-039-1053 | ND |
| 2015-09-22 | 9590-005-1053 | ND |
| 2015-09-22 | 9590-029-1053 | ND |
| 2015-09-22 | 9590-012-1110 | ND |
| 2015-12-29 | 9590-030-0903 | ND |
| 2015-12-29 | 9590-031-1037 | ND |
| 2016-09-06 | 9590-027-0850 | ND |
| 2016-09-06 | 9590-022-0950 | ND |
| 2016-09-06 | 9590-021-0910 | ND |
| 2016-09-06 | 9590-018-0907 | ND |
| 2016-09-06 | 9590-034-0945 | ND |
| 2016-09-06 | 9590-035-1005 | ND |
| 2016-09-13 | 9590-033-0941 | ND |
| 2017-07-18 | 1610-011-0831 | ND |
| 2017-07-18 | 1610-010-0855 | ND |
| 2017-07-18 | 1610-009-1030 | ND |
| 2017-07-18 | 1610-014-0920 | ND |
| 2017-07-18 | 1610-016-0800 | ND |
| 2017-07-18 | 1610-008-1000 | ND |
| 2017-07-18 | 1610-041-1100 | ND |
| 2017-08-01 | 1610-044-0905 | ND |
| 2018-08-07 | 1644-029-1045 | ND |
| 2018-08-07 | 1644-001-0922 | ND |
| 2018-08-07 | 1644-002-0922 | ND |
| 2018-08-07 | 1644-040-1045 | ND |
| 2018-08-07 | 1644-039-1045 | ND |
| 2018-08-07 | 1644-005-1045 | ND |
| 2018-09-25 | 1644-031-0935 | ND |
| 2018-09-25 | 1644-004-0852 | ND |
| 2018-09-25 | 1644-030-0950 | ND |
| 2018-11-06 | 1644-006-0900 | ND |
| 2019-03-05 | 1644-013-1030 | ND |
| 2019-09-10 | 1610-006-0835 | ND |
| 2019-09-10 | 1610-018-0835 | ND |
| 2019-09-10 | 1610-021-0905 | ND |
| 2019-09-12 | 1610-033-0851 | ND |
| 2019-09-12 | 1610-034-0851 | ND |
| 2019-09-12 | 1610-035-0851 | ND |
| 2019-09-12 | 1610-004-0851 | ND |