2,4,5-TP (Silvex)
Cottage Grove
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.
24
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 7 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-07-30 | 14G2400-01 | ND |
| 2014-10-23 | 14J1330-01 | ND |
| 2015-11-04 | 15K0288-01 | ND |
| 2016-03-10 | 16C0528-01 | ND |
| 2016-03-10 | 16C0530-01 | ND |
| 2016-03-10 | 16C0531-01 | ND |
| 2016-03-10 | 16C0532-01 | ND |
| 2016-05-11 | 3447218 | ND |
| 2016-05-11 | 3447237 | ND |
| 2017-08-02 | 17H0166-02 | ND |
| 2017-08-02 | 17H0166-01 | ND |
| 2017-10-18 | 17J0968-01 | ND |
| 2017-10-18 | 17J0968-02 | ND |
| 2017-10-18 | 17J0968-04 | ND |
| 2018-03-14 | 18C0523-01 | ND |
| 2018-03-14 | 18C0523-02 | ND |
| 2018-05-22 | 18E1853-01 | ND |
| 2018-08-23 | 18H2015-01 | ND |
| 2018-08-23 | 18H2016-01 | ND |
| 2018-12-05 | 18L0187-01 | ND |
| 2018-12-05 | 18L0188-01 | ND |
| 2019-02-14 | 19B0671-02 | ND |
| 2019-02-14 | 19B0673-01 | ND |
| 2019-05-28 | 19E2055-01 | ND |