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EWG's Tap Water Database — 2019 UPDATE

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2,4,5-TP (Silvex)

City of Hollister

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
2013N/A00N/A
2014ND60ND
2015N/A00N/A
2016ND50ND
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
2014-03-251610-009-1555ND
2014-03-251610-007-1445ND
2014-03-251610-006-1425ND
2014-03-251610-005-1540ND
2014-03-251610-002-1700ND
2014-03-251610-001-1635ND
2016-12-141644-007-1144ND
2016-12-141644-006-1105ND
2016-12-141644-005-0848ND
2016-12-141644-002-1013ND
2016-12-141644-001-0952ND
2017-12-071610-006-0950ND
2017-12-071610-007-1014ND
2017-12-071610-005-1048ND
2017-12-071610-002-1132ND
2017-12-071610-001-1120ND