2,4,5-TP (Silvex)
St. Louis City
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 2 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 10 | 0 | ND |
2017 | ND | 8 | 0 | ND |
2018 | ND | 10 | 0 | ND |
2019 | ND | 10 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
---|---|---|
2014-06-02 | AC23739 | ND |
2014-06-02 | AC23738 | ND |
2015-06-01 | AC47106 | ND |
2015-06-01 | AC47107 | ND |
2015-09-22 | HBCB092215M515 | ND |
2015-09-22 | CRCW092215M515 | ND |
2016-03-03 | HBCB030316M515 | ND |
2016-03-04 | CRCW030416M515 | ND |
2016-06-06 | AC75865 | ND |
2016-06-06 | AC75864 | ND |
2016-06-08 | HBCB060816M515 | ND |
2016-06-08 | CRCW060816M515 | ND |
2016-09-30 | HBCB093016M515 | ND |
2016-09-30 | CRCW093016M515 | ND |
2016-12-28 | HBCB122816M515 | ND |
2016-12-28 | CRCW122816M515 | ND |
2017-05-19 | AC98044 | ND |
2017-05-19 | AC98045 | ND |
2017-06-21 | AC99038 | ND |
2017-06-21 | AC99039 | ND |
2017-09-29 | HBCB092917M515 | ND |
2017-09-29 | CRCW092917M515 | ND |
2017-11-15 | CRCW111517M515 | ND |
2017-11-15 | HBCB111517M515 | ND |
2018-01-18 | CRCW011918M515 | ND |
2018-01-18 | HBCB011918M515 | ND |
2018-04-27 | HBCB042718M515 | ND |
2018-05-08 | CRCW050818M515 | ND |
2018-05-21 | AD20859 | ND |
2018-05-21 | AD20860 | ND |
2018-07-26 | HBCB072618M515 | ND |
2018-07-31 | CRCW073118M515 | ND |
2018-10-15 | HBCB101518M515 | ND |
2018-10-16 | CRCW101618M515 | ND |
2019-01-15 | CRCW011519M515 | ND |
2019-01-15 | HBCB011519M515 | ND |
2019-05-11 | CRCW051119M515 | ND |
2019-05-11 | HBCB051119M515 | ND |
2019-05-28 | AD47824 | ND |
2019-05-28 | AD47825 | ND |
2019-07-16 | CRCW071618M515 | ND |
2019-07-16 | HBCB071618M515 | ND |
2019-10-31 | CRCW103119M515 | ND |
2019-10-31 | HBCB103119M515 | ND |