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EWG's Tap Water Database — 2019 UPDATE

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2,4,5-TP (Silvex)

City of Caldwell

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.

 

16

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
2013ND40ND
2014ND40ND
2015ND30ND
2016ND50ND
2017N/A00N/A

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
2013-09-25S1341763ND
2013-09-25S1341762ND
2013-09-25S1341755ND
2013-09-25S1341752ND
2014-02-26S1407039ND
2014-06-18S1422594ND
2014-09-29S1438512ND
2014-11-13S1445335ND
2015-03-10S1509143ND
2015-05-06S1517379ND
2015-09-24S1541055ND
2016-09-06S1640378ND
2016-09-06S1640377ND
2016-09-06S1640376ND
2016-09-06S1640375ND
2016-09-06S1640374ND