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Secondary Treatment Expansion Program

Project
Public Works
Environmental Services is making the largest investment in its North Portland wastewater treatment plant in 50 years. The Secondary Treatment Expansion Program (STEP) will expand, upgrade, and replace equipment and buildings that have been in service since the 1970s.
Aerial photo of wastewater treatment plant with four areas shaded in yellow on northern end of campus to indicate project area.View full size image

Featured content

About the Secondary Treatment Expansion Program

Take a Virtual Tour of the Columbia Boulevard Wastewater Treatment Plant

About the Wastewater Treatment Process

About the Big Pipe Project

Biosolids return nutrients to the soil

Contact

Debbie Caselton (she/her)

Community Outreach
debbie.caselton@portlandoregon.gov
503-823-2831
711Oregon Relay Service

Related offices, programs, and projects

Environmental Services

Recovering Resources

Managing Stormwater

Preventing Pollution

Connecting to the Sewer

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