2,4,5-TP (Silvex)
CTWC - Shoreline Region-Guilford 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 | ND | 3 | 0 | ND |
| 2019 | ND | 16 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 16 | 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 |
|---|---|---|
| 2018-03-30 | CA11469SOCR | ND |
| 2018-03-30 | CA11465SOCR | ND |
| 2018-07-09 | CA86688 | ND |
| 2019-01-30 | SOC 200520057 | ND |
| 2019-02-27 | SOCR 200523002 | ND |
| 2019-06-06 | SOC 200535308 | ND |
| 2019-06-06 | SOC 200535309 | ND |
| 2019-06-11 | SOC 200536055 | ND |
| 2019-06-11 | SOC 200536054 | ND |
| 2019-06-19 | SOC 200542695 | ND |
| 2019-06-24 | SOC 200537520 | ND |
| 2019-07-29 | SOC 200542348 | ND |
| 2019-07-30 | SOC 200542453 | ND |
| 2019-07-31 | SOC 200542480 | ND |
| 2019-07-31 | SOC 200542466 | ND |
| 2019-07-31 | SOC 200542497 | ND |
| 2019-07-31 | SOC 200542499 | ND |
| 2019-07-31 | SOC 200542468 | ND |
| 2019-08-14 | SOC 200544869 | ND |
| 2020-02-11 | RSOC 200565797 | ND |
| 2021-09-30 | H300072106 300072108 | ND |
| 2021-09-30 | S300072074 300072087 | ND |
| 2022-06-14 | CL56474 | ND |
| 2022-06-14 | CL56470 | ND |
| 2022-06-14 | CL56472 | ND |
| 2022-06-15 | CL57887 | ND |
| 2022-06-15 | CL57885 | ND |
| 2022-06-22 | CL62297 | ND |
| 2022-06-28 | CL66245 | ND |
| 2022-07-18 | CL80434 | ND |
| 2022-07-18 | CL80432 | ND |
| 2022-07-18 | CL80438 | ND |
| 2022-07-18 | CL80436 | ND |
| 2022-07-25 | CL88838 | ND |
| 2022-07-25 | CL88842 | ND |
| 2022-08-29 | CM17828 | ND |
| 2022-08-29 | CM17831 | ND |
| 2022-10-19 | CM66672 | ND |
| 2023-02-13 | CN41859 | ND |