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EWG's Tap Water Database

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2,4,5-TP (Silvex)

Clearwater 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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND60ND
2011ND60ND
2012ND60ND
2013ND30ND
2014ND30ND
2015ND40ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 3 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 50 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)50.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Result
2010-02-10ND
2010-02-10ND
2010-02-11ND
2010-08-17ND
2010-08-17ND
2010-08-17ND
2011-02-16ND
2011-02-16ND
2011-02-16ND
2011-08-26ND
2011-08-26ND
2011-08-26ND
2012-02-10ND
2012-02-10ND
2012-02-10ND
2012-07-13ND
2012-07-13ND
2012-07-13ND
2013-02-01ND
2013-02-01ND
2013-02-01ND
2014-02-13ND
2014-08-14ND
2014-08-14ND
2015-01-13ND
2015-01-13ND
2015-05-07ND
2015-07-29ND