NPDES Permits Potentially Affecting Water Quality
Final NPDES Wastewater Permits - Issued by Oregon Department of Environmental Quality
This list consists of permit documents* (see end) made available by Oregon DEQ and is not all inclusive. All documents are PDF except where indicated.
Wilsonville Sewage Treatment Plant (STP): Final NPDES Wastewater Permit Related Documents
Permitted Mixing Zone Size for Toxicity:
Waterbody: Willamette River at about River Mile (RM) 38.6.
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Acute Mixing Zone Radius: 15 feet.
Acute Mixing Zone Surface Area: Estimated SA is approximately 707 square feet.
Chronic Mixing Zone Length: 150 feet downstream.
Chronic Mixing Zone Surface Area: Estimated SA is approximately 35,343 square feet.
Chronic Mixing Zone Volume: DEQ does not provide Willamette River MZ depth in the fact sheet so MZ volume is not yet determinable.
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