2,4,5-TP (Silvex)
City of Houston
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 | 32 | 0 | ND |
2015 | ND | 1 | 0 | ND |
2016 | ND | 10 | 0 | ND |
2017 | ND | 38 | 0 | ND |
2018 | ND | 1 | 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 |
---|---|---|
2014-03-14 | AC47173 | ND |
2014-04-16 | AC50892 | ND |
2014-04-16 | AC50899 | ND |
2014-04-16 | AC50893 | ND |
2014-04-16 | AC50891 | ND |
2014-04-17 | AC51139 | ND |
2014-04-17 | AC51143 | ND |
2014-04-17 | AC51142 | ND |
2014-04-17 | AC51144 | ND |
2014-04-17 | AC51141 | ND |
2014-04-17 | AC51150 | ND |
2014-04-17 | AC51138 | ND |
2014-04-17 | AC51140 | ND |
2014-06-03 | AC55820 | ND |
2014-07-16 | AC59859 | ND |
2014-08-14 | AC63737 | ND |
2014-08-14 | AC63734 | ND |
2014-08-14 | AC63738 | ND |
2014-08-14 | AC63740 | ND |
2014-10-08 | AC69225 | ND |
2014-10-08 | AC69228 | ND |
2014-10-08 | AC69224 | ND |
2014-10-09 | AC69379 | ND |
2014-10-09 | AC69380 | ND |
2014-10-09 | AC69377 | ND |
2014-10-09 | AC69376 | ND |
2014-10-09 | AC69375 | ND |
2014-10-09 | AC69378 | ND |
2014-12-09 | AC74238 | ND |
2014-12-09 | AC74239 | ND |
2014-12-09 | AC74240 | ND |
2014-12-18 | AC75473 | ND |
2015-03-04 | AC83017 | ND |
2016-02-18 | AD24477 | ND |
2016-03-03 | AD26975 | ND |
2016-03-16 | AD29178 | ND |
2016-03-16 | AD29181 | ND |
2016-03-17 | AD29414 | ND |
2016-03-23 | AD30221 | ND |
2016-09-20 | AD50440 | ND |
2016-09-20 | AD50441 | ND |
2016-09-21 | AD50866 | ND |
2016-10-06 | AD52699 | ND |
2017-01-26 | AD67274 | ND |
2017-01-26 | AD67267 | ND |
2017-01-26 | AD67273 | ND |
2017-01-26 | AD67268 | ND |
2017-02-28 | AD72569 | ND |
2017-03-02 | AD73241 | ND |
2017-03-28 | AD77239 | ND |
2017-03-28 | AD77249 | ND |
2017-03-28 | AD77248 | ND |
2017-03-28 | AD77237 | ND |
2017-03-28 | AD77238 | ND |
2017-03-29 | AD77530 | ND |
2017-03-29 | AD77533 | ND |
2017-03-29 | AD77531 | ND |
2017-03-29 | AD77532 | ND |
2017-04-26 | AD81269 | ND |
2017-04-27 | AD81577 | ND |
2017-04-27 | AD81578 | ND |
2017-07-06 | AD88535 | ND |
2017-07-06 | AD88537 | ND |
2017-07-26 | AD90913 | ND |
2017-09-11 | AD95599 | ND |
2017-09-11 | AD95592 | ND |
2017-09-11 | AD95596 | ND |
2017-09-11 | AD95595 | ND |
2017-09-11 | AD95593 | ND |
2017-09-11 | AD95597 | ND |
2017-09-26 | AD98108 | ND |
2017-09-26 | AD98109 | ND |
2017-11-07 | AE03921 | ND |
2017-11-07 | AE03919 | ND |
2017-11-07 | AE03916 | ND |
2017-11-07 | AE03917 | ND |
2017-11-07 | AE03920 | ND |
2017-11-07 | AE03918 | ND |
2017-11-14 | AE04808 | ND |
2017-12-04 | AE06625 | ND |
2017-12-04 | AE06626 | ND |
2018-01-18 | AE09316 | ND |
2019-01-15 | AE50230 | ND |
2019-01-15 | AE50229 | ND |
2019-01-16 | AE50236 | ND |
2019-03-06 | AE57434 | ND |
2019-03-06 | AE57435 | ND |
2019-04-10 | AE62131 | ND |
2019-07-25 | AE76035 | ND |
2019-07-25 | AE76036 | ND |
2019-09-23 | AE84275 | ND |
2019-09-23 | AE84274 | ND |