2,4,5-TP (Silvex)
Manchester Water Department
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 | 8 | 0 | ND |
| 2019 | ND | 11 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 15 | 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 |
|---|---|---|
| 2018-02-23 | AA82899-SOCR | ND |
| 2018-06-13 | AA84269-SOC2 | ND |
| 2018-06-13 | AA84270-SOC2 | ND |
| 2018-06-26 | AA84433-SOC2 | ND |
| 2018-06-27 | AA84458-SOC2 | ND |
| 2018-06-27 | AA84459-SOC2 | ND |
| 2018-06-29 | AA84479-SOC2 | ND |
| 2018-06-29 | AA84480-SOC2 | ND |
| 2019-05-03 | AA88240-SOCR | ND |
| 2019-09-16 | AA90007-SOC2 | ND |
| 2019-09-16 | AA89985-SOC2 | ND |
| 2019-09-16 | AA89986-SOC2 | ND |
| 2019-09-16 | AA89986-SOC2 | ND |
| 2019-09-16 | AA90001-SOC2 | ND |
| 2019-09-16 | AA90001-SOC2 | ND |
| 2019-09-16 | AA89989-SOC2 | ND |
| 2019-09-17 | AA89998-SOC2 | ND |
| 2019-09-17 | AA90002-SOC2 | ND |
| 2019-09-17 | AA89998-SOC2 | ND |
| 2020-10-01 | AA94988-SOCR | ND |
| 2021-11-04 | 211104-1-04RSOC | ND |
| 2022-06-03 | 220603-1-04 RSOC | ND |
| 2022-06-06 | 220606-1-06 SOC | ND |
| 2022-06-06 | 220606-3-01SOC | ND |
| 2022-06-06 | 220606-3-02 SOC | ND |
| 2022-06-06 | 220606-3-03 SOC | ND |
| 2022-06-07 | 220607-3-04SOC | ND |
| 2022-06-08 | 220608-3-05 SOC | ND |
| 2022-06-08 | 220608-3-06 SOC | ND |
| 2022-09-01 | 220901-3-08SOC | ND |
| 2022-09-01 | 220901-3-09SOC | ND |
| 2022-09-01 | 220901-3-06SOC | ND |
| 2022-09-07 | 220907-1-10SOC | ND |
| 2022-09-07 | 220907-3-05 SOC | ND |
| 2022-09-07 | 220907-3-06SOC | ND |
| 2022-10-12 | 221012-3-04 SOC | ND |
| 2023-12-05 | 231205-1-04 RTP | ND |