2,4,5-TP (Silvex)
Metropolitan District Commission
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 | 11 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 7 | 0 | ND |
| 2022 | ND | 7 | 0 | ND |
| 2023 | ND | 7 | 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 |
|---|---|---|
| 2018-06-27 | CA79476 | ND |
| 2018-06-27 | CA79475 | ND |
| 2018-06-27 | CA79477 | ND |
| 2018-07-18 | SOCR 200500124 | ND |
| 2018-07-18 | SOCR 200500122 | ND |
| 2018-07-18 | SOCR 200500126 | ND |
| 2018-07-18 | SOCR 200500125 | ND |
| 2018-09-25 | CB38504 | ND |
| 2018-09-25 | CB38505R | ND |
| 2018-09-25 | CB38869 | ND |
| 2018-09-25 | CB38505 | ND |
| 2019-07-08 | SOCR 200539198 | ND |
| 2019-07-08 | SOCR 200539200 | ND |
| 2019-07-08 | SOCR 200539199 | ND |
| 2019-07-08 | SOCR 200539197 | ND |
| 2020-12-08 | SOC 200600638 | ND |
| 2020-12-08 | SOC 200600609 | ND |
| 2020-12-08 | SOCR 200600618 | ND |
| 2020-12-08 | SOCR 200600626 | ND |
| 2020-12-08 | SOCR 200600627 | ND |
| 2020-12-08 | SOCR 200600628 | ND |
| 2020-12-09 | SOC 200600592 | ND |
| 2021-11-23 | S300107593 300107595 | ND |
| 2021-11-23 | H300107603 300107604 | ND |
| 2021-11-23 | S300107511 300107512 | ND |
| 2021-11-29 | S300109627 300109628 | ND |
| 2021-11-29 | H300109590 300109592 | ND |
| 2021-11-30 | H300109617 300109620 | ND |
| 2021-11-30 | H300109618 300109622 | ND |
| 2022-12-08 | H300283837 300283839 | ND |
| 2022-12-08 | 300283822 300283832C | ND |
| 2022-12-15 | S300287062 300287064 | ND |
| 2022-12-15 | H300287081 300287083 | ND |
| 2022-12-15 | H300287109 300287117 | ND |
| 2022-12-15 | S300287090 300287092 | ND |
| 2022-12-15 | S300287039 300287043 | ND |
| 2023-12-05 | S300456329 300456331 | ND |
| 2023-12-05 | H300456519 300456521 | ND |
| 2023-12-05 | H300456542 300456544 | ND |
| 2023-12-05 | H300456513 300456515 | ND |
| 2023-12-06 | S300456308 300456310 | ND |
| 2023-12-06 | S300456298 300456300 | ND |
| 2023-12-06 | H300456516 300456518 | ND |