2,4,5-TP (Silvex)
Myoma Dunes Mutual 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.
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 | ND | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2019-11-18 | CA3310051_011_011-201911180951 | ND |
| 2019-11-22 | CA3310051_010_010-201911220939 | ND |
| 2020-08-24 | CA3310051_009_009-202008241030 | ND |
| 2022-08-19 | CA3310051_011_011-202208190752 | ND |
| 2022-08-19 | CA3310051_010_010-202208190715 | ND |
| 2022-08-30 | CA3310051_008_008-202208300857 | ND |
| 2022-08-30 | CA3310051_007_007-202208300810 | ND |
| 2023-08-22 | CA3310051_009_009-202308220650 | ND |