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EWG's Tap Water Database — 2019 UPDATE

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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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND10ND
2014ND20ND
2015ND40ND
2016ND100ND
2017ND80ND

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
2012-05-09AB71796ND
2012-05-09AB71797ND
2013-05-06AB97904ND
2014-06-02AC23738ND
2014-06-02AC23739ND
2015-06-01AC47107ND
2015-06-01AC47106ND
2015-09-22CRCW092215M515ND
2015-09-22HBCB092215M515ND
2016-03-03HBCB030316M515ND
2016-03-04CRCW030416M515ND
2016-06-06AC75865ND
2016-06-06AC75864ND
2016-06-08CRCW060816M515ND
2016-06-08HBCB060816M515ND
2016-09-30HBCB093016M515ND
2016-09-30CRCW093016M515ND
2016-12-28HBCB122816M515ND
2016-12-28CRCW122816M515ND
2017-05-19AC98045ND
2017-05-19AC98044ND
2017-06-21AC99038ND
2017-06-21AC99039ND
2017-09-29HBCB092917M515ND
2017-09-29CRCW092917M515ND
2017-11-15CRCW111517M515ND
2017-11-15HBCB111517M515ND