2,4,5-TP (Silvex)
Wallingford 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.
15
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 | 1 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-08-11 | BG91554SOCR | ND |
| 2015-05-11 | BJ14762SOCR | ND |
| 2016-05-09 | BN27827SOCR | ND |
| 2016-07-28 | 11609SOC2 | ND |
| 2016-07-28 | 11610SOC2 | ND |
| 2016-10-26 | 16308SOC2 | ND |
| 2016-10-26 | 16309SOC2 | ND |
| 2017-08-02 | 9129SOCR | ND |
| 2018-06-28 | CA80406 | ND |
| 2019-08-05 | CD73202-P2 | ND |
| 2019-08-05 | CD73200 | ND |
| 2019-08-12 | CD83465-P2 | ND |
| 2019-09-16 | CE10614-P2 | ND |
| 2019-10-10 | CE30938-P2 | ND |
| 2019-11-04 | CE53371-P2 | ND |