2,4,5-TP (Silvex)
Maryland American 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.
23
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 | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2014-06-18 | 0120003_02_25671 | ND |
| 2014-06-18 | 0120003_01_25676 | ND |
| 2014-07-22 | 0120003_01_00029 | ND |
| 2014-08-12 | 0120003_01_26567 | ND |
| 2015-05-12 | 28899901 | ND |
| 2015-05-12 | 28898301 | ND |
| 2015-08-18 | 30218701 | ND |
| 2015-10-19 | E16001689001 | ND |
| 2016-05-10 | E16004258012 | ND |
| 2016-05-10 | E16004258014 | ND |
| 2016-08-09 | 32882201_A | ND |
| 2016-08-09 | 32882201 | ND |
| 2017-04-19 | E17004142001 | ND |
| 2017-05-09 | 35398201 | ND |
| 2017-05-09 | 35392801 | ND |
| 2017-08-08 | 36568101 | ND |
| 2018-05-08 | 39313201 | ND |
| 2018-05-15 | 39310701 | ND |
| 2018-06-04 | E18004355001 | ND |
| 2018-08-08 | 40555301_A | ND |
| 2018-09-18 | E19000986001 | ND |
| 2019-05-16 | 438938 | ND |
| 2019-05-21 | 438925 | ND |