2,4,5-TP (Silvex)
Groton Utilities
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 1 | 0 | ND |
2015 | ND | 3 | 0 | ND |
2016 | ND | 1 | 0 | ND |
2017 | ND | 1 | 0 | ND |
2018 | ND | 3 | 0 | ND |
2019 | ND | 1 | 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 |
---|---|---|
2014-10-23 | 19753SOCR | ND |
2015-04-23 | 20627SOC2 | ND |
2015-07-16 | 21104SOC2 | ND |
2015-10-15 | 21609SOCR | ND |
2016-10-27 | 23865SOCR | ND |
2017-10-26 | 26173SOCR | ND |
2018-07-02 | 27614SOC2 | ND |
2018-10-04 | 28982SOC2 | ND |
2018-11-29 | 28981SOCR | ND |
2019-11-20 | 30752SOCR | ND |