2,4,5-TP (Silvex)
Exeter Water Department
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.
12
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 | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 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 |
|---|---|---|
| 2014-07-09 | 133509.01 | ND |
| 2014-10-09 | 136708.02 | ND |
| 2015-07-16 | 145750.01 | ND |
| 2015-09-09 | 147823.01 | ND |
| 2016-02-10 | 152998.01 | ND |
| 2016-07-13 | 158246.01 | ND |
| 2017-07-11 | 170940.01 | ND |
| 2017-10-11 | 174517.01 | ND |
| 2018-07-11 | 184059.01 | ND |
| 2018-10-03 | 187376.01 | ND |
| 2019-07-10 | 197719.01 | ND |
| 2019-10-08 | 201538.01 | ND |