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EWG's Tap Water Database — 2021 UPDATE

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2,4,5-TP (Silvex)

Zone 7 Water Agency

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015N/A00N/A
2016N/A00N/A
2017ND50ND
2018N/A00N/A
2019N/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
2014-06-099590-001-1000ND
2014-06-099590-008-1055ND
2014-06-109590-005-1040ND
2014-06-109590-011-1000ND
2014-06-119590-006-0825ND
2014-06-119590-013-0930ND
2014-06-169590-007-0910ND
2014-06-179590-012-1125ND
2014-06-199590-019-0935ND
2014-11-139590-017-0905ND
2017-07-101610-019-1135ND
2017-07-111610-001-0935ND
2017-07-111610-008-0955ND
2017-07-121610-012-0900ND
2017-09-251610-005-1010ND