2,4,5-TP (Silvex)
Oyster Bay Water District
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.
25
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 | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2014-06-04 | 1406268-005-SOCS | ND |
| 2014-06-04 | 1406268-004-SOCS | ND |
| 2014-06-04 | 1406268-001-SOCS | ND |
| 2014-06-04 | 1406268-003-SOCS | ND |
| 2014-06-04 | 1406268-002-SOCS | ND |
| 2015-05-20 | 1505E61-002-SOCS | ND |
| 2015-05-20 | 1505E61-001-SOCS | ND |
| 2015-05-20 | 1505E61-003-SOCS | ND |
| 2015-05-20 | 1505E61-004-SOCS | ND |
| 2015-05-20 | 1505E61-005-SOCS | ND |
| 2016-06-28 | 1606Q85-004-SOCS | ND |
| 2016-06-28 | 1606Q85-003-SOCS | ND |
| 2016-06-28 | 1606Q85-002-SOCS | ND |
| 2016-06-28 | 1606Q85-001-SOCS | ND |
| 2016-06-29 | 1606S10-001-SOCS | ND |
| 2017-06-27 | 7022481004 | ND |
| 2017-06-27 | 7022481001 | ND |
| 2017-06-27 | 7022481002 | ND |
| 2017-06-27 | 7022481005 | ND |
| 2017-06-27 | 7022481003 | ND |
| 2018-07-02 | 7056848003-SOC | ND |
| 2018-07-02 | 7056848004-SOC | ND |
| 2018-07-02 | 7056848001-SOC | ND |
| 2018-07-02 | 7056848005-SOC | ND |
| 2018-07-02 | 7056848002-SOC | ND |