2,4,5-TP (Silvex)
Norwich Public 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.
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 |
|---|---|---|---|---|
| 2014 | ND | 8 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 8 | 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 |
|---|---|---|
| 2014-05-01 | 6300207SOC2 | ND |
| 2014-05-01 | 6300208SOC2 | ND |
| 2014-05-01 | 6300216SOCR | ND |
| 2014-05-01 | 6300217SOCR | ND |
| 2014-05-01 | 6300206SOC2 | ND |
| 2014-09-10 | 6300380SOC2 | ND |
| 2014-09-10 | 6300381SOC2 | ND |
| 2014-09-10 | 6300382SOC2 | ND |
| 2015-11-19 | 6301452SOCR | ND |
| 2015-11-19 | 6301453SOCR | ND |
| 2016-11-17 | 6302602SOCR | ND |
| 2016-11-17 | 6302603SOCR | ND |
| 2017-05-04 | PH-0453-6303174S | ND |
| 2017-05-04 | PH-0453-6303176S | ND |
| 2017-05-04 | PH-0453-6303175S | ND |
| 2017-07-06 | PH-0453-6303367S | ND |
| 2017-07-06 | PH-0453-6303368S | ND |
| 2017-07-06 | PH-0453-6303369S | ND |
| 2017-08-18 | PH-0453-6303370S | ND |
| 2017-08-18 | PH-0453-6303371S | ND |
| 2018-10-30 | PH-0453-6304745S | ND |
| 2018-10-30 | PH-0453-6304746S | ND |
| 2019-12-12 | PH-0453-6305859S | ND |
| 2019-12-12 | PH-0453-6305860S | ND |