2,4,5-TP (Silvex)
Newberry 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 12 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 12 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2020-04-23 | 22184193.00 | ND |
| 2020-04-23 | 22184157.00 | ND |
| 2020-04-30 | 22184219.00 | ND |
| 2020-05-19 | 22383220.00 | ND |
| 2020-05-19 | 22383184.00 | ND |
| 2020-05-19 | 22383256.00 | ND |
| 2020-08-13 | 22969988.00 | ND |
| 2020-08-13 | 22969947.00 | ND |
| 2020-08-27 | 22970410.00 | ND |
| 2020-08-27 | 22970336.00 | ND |
| 2020-08-27 | 22970374.00 | ND |
| 2020-08-27 | 22970298.00 | ND |
| 2023-04-04 | 28871674.00 | ND |
| 2023-04-04 | 28871686.00 | ND |
| 2023-04-04 | 28871680.00 | ND |
| 2023-04-12 | 28872298.00 | ND |
| 2023-04-12 | 28872304.00 | ND |
| 2023-04-12 | 28872310.00 | ND |
| 2023-07-13 | 29467486.00 | ND |
| 2023-07-13 | 29467638.00 | ND |
| 2023-07-13 | 29467589.00 | ND |
| 2023-07-18 | 29467516.00 | ND |
| 2023-07-18 | 29467577.00 | ND |
| 2023-07-18 | 29467547.00 | ND |