2,4,5-TP (Silvex)
CTWC - Unionville System
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.
28
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 | 8 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-01-21 | BG01716SOC2 | ND |
| 2014-01-21 | BG01717SOC2 | ND |
| 2014-01-21 | BG01713SOC2 | ND |
| 2014-01-22 | BG01714SOC2 | ND |
| 2014-01-22 | BG01715SOC2 | ND |
| 2014-01-22 | BG01718SOC2 | ND |
| 2014-01-22 | BG01719SOC2 | ND |
| 2014-02-14 | BG09385SOC2 | ND |
| 2015-02-04 | 3181316 | ND |
| 2015-06-03 | 3254568 | ND |
| 2015-07-13 | BJ46102SOC2 | ND |
| 2015-07-15 | BJ46999SOC2 | ND |
| 2017-08-29 | BY91937SOC2 | ND |
| 2017-08-29 | BY91939SOC2 | ND |
| 2017-08-29 | BY91938SOC2 | ND |
| 2017-11-21 | BZ45452SOC2 | ND |
| 2019-09-17 | SOC 200549386 | ND |
| 2019-09-17 | SOC 200549392 | ND |
| 2019-09-25 | SOC 200550426 | ND |
| 2019-09-25 | SOC 200550428 | ND |
| 2019-09-25 | SOC 200550427 | ND |
| 2019-10-02 | SOC 200551433 | ND |
| 2019-10-02 | SOC 200551434 | ND |
| 2019-10-09 | SOC 200552469 | ND |
| 2019-10-10 | SOC 200552468 | ND |
| 2019-10-10 | SOC 200552467 | ND |
| 2019-10-10 | SOC 200552466 | ND |
| 2019-10-10 | SOC 200552465 | ND |