Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

2,4,5-TP (Silvex)

North Penn Water Authority

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.

 

56

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND240ND
2015ND20ND
2016ND20ND
2017ND280ND

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
2014-04-2214040589-01ND
2014-04-2214030712-01ND
2014-04-2214030714-01ND
2014-04-2214040590-01ND
2014-04-2214030715-01ND
2014-04-2814040582-01ND
2014-04-2914030720-01ND
2014-04-2914030716-01ND
2014-04-2914030718-01ND
2014-05-1914041348-01ND
2014-06-0914060593-01ND
2014-06-0914060589-01ND
2014-07-0714070804-001ND
2014-07-0714070787-001ND
2014-07-0714070808-001ND
2014-07-0714070812-001ND
2014-07-0714070809-001ND
2014-07-2114072516-001ND
2014-07-2114072521-001ND
2014-08-0414080384-001ND
2014-08-2514082298-01ND
2014-08-2514082297-01ND
2014-08-2514082296-01ND
2014-08-2514082295-01ND
2015-07-0213013261ND
2015-12-0913633941ND
2016-08-2314907927ND
2016-11-0215226754ND
2017-02-2215795488ND
2017-04-0515937092ND
2017-04-0515937117ND
2017-04-0515937021ND
2017-04-0515937163ND
2017-04-0515937056ND
2017-04-0515936985ND
2017-04-0515937198ND
2017-04-1915937871ND
2017-04-1915937907ND
2017-04-1915938015ND
2017-04-1915938051ND
2017-04-1915937979ND
2017-04-1915937943ND
2017-07-1216414008ND
2017-07-1216414080ND
2017-07-1216414044ND
2017-07-1216414115ND
2017-07-1216413902ND
2017-07-1216413937ND
2017-07-1216413973ND
2017-07-1716414295ND
2017-07-1716414259ND
2017-07-1716414223ND
2017-07-1716414151ND
2017-07-1716414187ND
2017-07-1716414331ND
2017-10-0916880778ND