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EWG's Tap Water Database — 2021 UPDATE

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2,4,5-TP (Silvex)

San Antonio Water System

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.

MORE ABOUT THIS CONTAMINANT

 

97

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND310ND
2015N/A00N/A
2016ND80ND
2017ND440ND
2018ND70ND
2019ND70ND

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
2014-01-13AC38619ND
2014-01-13AC38624ND
2014-01-13AC38620ND
2014-01-13AC38617ND
2014-01-13AC38616ND
2014-01-14AC38850ND
2014-01-14AC38851ND
2014-01-14AC38849ND
2014-01-14AC38852ND
2014-01-14AC38865ND
2014-01-15AC39083ND
2014-03-31AC48789ND
2014-03-31AC48793ND
2014-03-31AC48790ND
2014-03-31AC48791ND
2014-03-31AC48792ND
2014-03-31AC48795ND
2014-05-13AC54002ND
2014-05-13AC54003ND
2014-06-30AC58427ND
2014-06-30AC58428ND
2014-07-29AC61392ND
2014-07-29AC61395ND
2014-07-29AC61391ND
2014-07-31AC61793ND
2014-09-02AC65474ND
2014-09-29AC68422ND
2014-09-29AC68421ND
2014-09-29AC68425ND
2014-11-25AC73012ND
2014-11-25AC73016ND
2016-06-28AD42277ND
2016-09-01AD47735ND
2016-11-02AD56244ND
2016-11-02AD56246ND
2016-11-02AD56245ND
2016-11-02AD56247ND
2016-11-03AD56537ND
2016-11-29AD59421ND
2017-01-30AD67653ND
2017-01-30AD67652ND
2017-01-30AD67643ND
2017-02-01AD68178ND
2017-02-01AD68179ND
2017-02-02AD68498ND
2017-03-06AD73510ND
2017-03-06AD73511ND
2017-03-06AD73509ND
2017-03-29AD77525ND
2017-03-29AD77524ND
2017-03-29AD77527ND
2017-03-29AD77523ND
2017-03-29AD77526ND
2017-03-30AD77850ND
2017-03-30AD77849ND
2017-03-30AD77848ND
2017-04-25AD81006ND
2017-07-06AD88540ND
2017-07-06AD88538ND
2017-09-11AD95600ND
2017-09-11AD95598ND
2017-09-11AD95594ND
2017-10-17AE01154ND
2017-10-18AE01415ND
2017-10-18AE01417ND
2017-10-18AE01418ND
2017-12-04AE06627ND
2017-12-05AE06822ND
2017-12-05AE06823ND
2017-12-05AE06821ND
2017-12-06AE07056ND
2017-12-07AE07275ND
2017-12-07AE07272ND
2017-12-07AE07276ND
2017-12-07AE07271ND
2017-12-07AE07274ND
2017-12-07AE07270ND
2017-12-08AE07454ND
2017-12-08AE07455ND
2017-12-13AE07703ND
2017-12-13AE07704ND
2017-12-13AE07705ND
2017-12-20AE07873ND
2018-03-01AE16420ND
2018-05-10AE25988ND
2018-07-02AE32301ND
2018-08-31AE39182ND
2018-11-19AE46525ND
2018-11-19AE46528ND
2018-12-13AE48873ND
2019-01-30AE52285ND
2019-01-31AE52510ND
2019-03-28AE60523ND
2019-03-28AE60522ND
2019-04-23AE63412ND
2019-04-25AE63785ND
2019-11-26AE90663ND