2,4,5-TP (Silvex)
Comanche Harbor & Port Ocall
NOTE: Comanche Harbor & Port Ocall purchases water from Acton MUD which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Acton MUD.
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 | ND | 2 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 18 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 14 | 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
NOTE: Comanche Harbor & Port Ocall purchases water from Acton MUD which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Acton MUD.
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-28 | Q1812936038 | ND |
| 2019-03-26 | Q1912275002 | ND |
| 2020-03-04 | Q2008205053 | ND |
| 2020-03-04 | Q2008205054 | ND |
| 2020-03-04 | Q2008205055 | ND |
| 2020-03-04 | Q2008205056 | ND |
| 2020-03-04 | Q2008205057 | ND |
| 2020-03-04 | Q2008205058 | ND |
| 2020-03-04 | Q2008205059 | ND |
| 2020-03-04 | Q2008205060 | ND |
| 2020-03-25 | Q2012703011 | ND |
| 2020-03-25 | Q2012703012 | ND |
| 2020-03-25 | Q2012703013 | ND |
| 2020-03-25 | Q2012703037 | ND |
| 2020-03-25 | Q2012703038 | ND |
| 2020-03-25 | Q2012703039 | ND |
| 2020-03-25 | Q2012703040 | ND |
| 2020-07-29 | Q2029640017 | ND |
| 2020-07-29 | Q2029640016 | ND |
| 2020-09-17 | Q2037199006 | ND |
| 2021-04-01 | Q2108342011 | ND |
| 2022-01-27 | Q2202897006 | ND |
| 2023-07-26 | Q2329862007 | ND |
| 2023-10-18 | Q2344522048 | ND |
| 2023-10-18 | Q2344522062 | ND |
| 2023-10-18 | Q2344522050 | ND |
| 2023-10-18 | Q2344522049 | ND |
| 2023-10-18 | Q2344522030 | ND |
| 2023-10-18 | Q2344522009 | ND |
| 2023-10-18 | Q2344522008 | ND |
| 2023-10-18 | Q2344522001 | ND |
| 2023-11-14 | Q2348718014 | ND |
| 2023-11-14 | Q2348718015 | ND |
| 2023-11-14 | Q2348718016 | ND |
| 2023-11-14 | Q2348718017 | ND |
| 2023-11-14 | Q2348718027 | ND |