2,4,5-TP (Silvex)
Hardin County Water District #1/Ft. Knox
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.
16
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 | 4 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-03-10 | 2988440 | ND |
| 2014-04-01 | 3000548 | ND |
| 2014-10-22 | 3127165 | ND |
| 2014-10-27 | 3129159 | ND |
| 2015-03-03 | 3197992 | ND |
| 2015-04-15 | 3225020 | ND |
| 2016-03-09 | 3412095 | ND |
| 2016-10-03 | 3557257 | ND |
| 2017-06-28 | 3722934 | ND |
| 2017-07-17 | 3734021 | ND |
| 2017-10-03 | 3792362 | ND |
| 2017-10-03 | 3792352 | ND |
| 2018-05-15 | 3937161 | ND |
| 2018-06-06 | 3954321 | ND |
| 2019-07-16 | 4354441 | ND |
| 2019-10-03 | 4444492 | ND |