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EWG's Tap Water Database — 2019 UPDATE

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2,4,5-TP (Silvex)

City of South 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.

 

10

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
2014ND50ND
2015N/A00N/A
2016N/A00N/A
2017ND50ND

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
2014-01-14AC38854ND
2014-01-14AC38856ND
2014-01-14AC38853ND
2014-01-14AC38861ND
2014-01-14AC38855ND
2017-01-06AD63703ND
2017-02-10AD70458ND
2017-03-01AD72856ND
2017-03-01AD72857ND
2017-03-01AD72858ND