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EWG's Tap Water Database — 2019 UPDATE

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2,4,5-TP (Silvex)

City of Lewiston

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
2014ND70ND
2015ND60ND
2016ND20ND
2017ND40ND

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
2012-04-03S59257ND
2013-02-27S130228026-001ND
2014-02-25S140226039-001ND
2014-02-25S140226039-002ND
2014-08-13S140814054-005ND
2014-08-13S140814054-004ND
2014-08-13S140814054-003ND
2014-08-13S140814054-002ND
2014-08-13S140814054-001ND
2015-01-21S2150122025-001ND
2015-07-22S150723044-003ND
2015-07-22S150723044-002ND
2015-07-22S150723044-001ND
2015-08-19S150819036-001ND
2015-08-19S150819036-002ND
2016-02-09S160209050-002ND
2016-05-16S160518056-001ND
2017-03-28S170328050-001ND
2017-03-28S170328050-002ND
2017-09-19S170920029-004ND
2017-09-19S170920029-003ND