2,4,5-TP (Silvex)
Monticello 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.
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 | 8 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-07-14 | 14198008702 | ND |
| 2014-07-14 | 14198008602 | ND |
| 2014-09-30 | 14275001602 | ND |
| 2014-09-30 | 14275001502 | ND |
| 2014-11-03 | 14310001902 | ND |
| 2014-11-03 | 14310002102 | ND |
| 2014-11-03 | 14310002002 | ND |
| 2014-11-03 | 14310002202 | ND |
| 2015-08-03 | 15218000302 | ND |
| 2016-01-20 | 16025000202 | ND |
| 2016-05-03 | 16126016402 | ND |
| 2016-05-03 | 16126016302 | ND |
| 2017-07-31 | 17215005201 | ND |
| 2017-07-31 | 17215005501 | ND |
| 2017-07-31 | 17215005401 | ND |
| 2017-07-31 | 17215005301 | ND |
| 2017-11-06 | 17312000602 | ND |
| 2017-11-06 | 17312000502 | ND |
| 2017-11-06 | 17312000402 | ND |
| 2017-11-06 | 17312000302 | ND |
| 2019-02-26 | 19059002402 | ND |
| 2019-04-30 | 19121003702 | ND |
| 2019-04-30 | 19121003802 | ND |
| 2019-09-16 | 19261001502 | ND |