2,4,5-TP (Silvex)
San Antonio 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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 10 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 9 | 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 |
|---|---|---|
| 2020-04-07 | CA3610085_021_021-202004071020 | ND |
| 2020-09-29 | CA3610085_001_001-202009291040 | ND |
| 2020-09-29 | CA3610085_018_018-202009290800 | ND |
| 2020-09-29 | CA3610085_016_016-202009291145 | ND |
| 2020-10-06 | CA3610085_017_017-202010061130 | ND |
| 2020-10-06 | CA3610085_013_013-202010061150 | ND |
| 2020-10-06 | CA3610085_002_002-202010061100 | ND |
| 2020-10-13 | CA3610085_011_011-202010130900 | ND |
| 2020-10-13 | CA3610085_003_003-202010130830 | ND |
| 2020-10-14 | CA3610085_004_004-202010140930 | ND |
| 2023-04-20 | CA3610085_021_021-202304201200 | ND |
| 2023-07-06 | CA3610085_011_011-202307061155 | ND |
| 2023-07-06 | CA3610085_013_013-202307061425 | ND |
| 2023-07-06 | CA3610085_017_017-202307061400 | ND |
| 2023-07-06 | CA3610085_003_003-202307061110 | ND |
| 2023-07-10 | CA3610085_016_016-202307101515 | ND |
| 2023-07-10 | CA3610085_001_001-202307101445 | ND |
| 2023-07-12 | CA3610085_004_004-202307120930 | ND |
| 2023-07-12 | CA3610085_002_002-202307121140 | ND |