2,4,5-TP (Silvex)
Block Island Water Company
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.
30
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 | 2 | 0 | ND |
| 2015 | ND | 12 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 13 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-09-10 | E409C65-2_SOC | ND |
| 2014-11-12 | E411C57-1_SOC | ND |
| 2015-03-11 | E503988-1_SOC | ND |
| 2015-05-13 | E505E80-3_SOC | ND |
| 2015-05-13 | E505E80-5_SOC | ND |
| 2015-05-13 | E505E80-4_SOC | ND |
| 2015-05-13 | E505E80-1_SOC | ND |
| 2015-05-13 | E505E80-6_SOC | ND |
| 2015-05-13 | E505E80-7_SOC | ND |
| 2015-11-18 | E511L40-3_SOC | ND |
| 2015-11-18 | E511L40-5_SOC | ND |
| 2015-11-18 | E511L40-4_SOC | ND |
| 2015-11-18 | E511L40-2_SOC | ND |
| 2015-11-18 | E511L40-1_SOC | ND |
| 2017-06-27 | D7F2727-01_SOC | ND |
| 2017-08-16 | D7H2328-02_SOC | ND |
| 2017-11-08 | D7K1021-01_SOC | ND |
| 2018-02-07 | D8B0696-02_SOC | ND |
| 2018-04-11 | D8D1179-01_SOC | ND |
| 2018-04-11 | D8D1183-01_SOC | ND |
| 2018-04-11 | D8D1177-01_SOC | ND |
| 2018-04-11 | D8D1180-01_SOC | ND |
| 2018-04-11 | D8D1178-01_SOC | ND |
| 2018-04-11 | D8D1181-01_SOC | ND |
| 2018-11-14 | 1811-1745-1_SOC | ND |
| 2018-11-14 | 1811-1744-1_SOC | ND |
| 2018-11-14 | 1811-1746-1_SOC | ND |
| 2018-11-14 | 1811-1742-1_SOC | ND |
| 2018-11-14 | 1811-1741-1_SOC | ND |
| 2018-12-12 | 1812-1495-5_SOC | ND |