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Secondary Treatment Expansion Program

Project

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.

Featured content

Aerial photo from 1974 of the Columbia Boulevard Wastewater Treatment Plant. About half the plant is outlined to show what areas are being impacted by the STEP program.

About the Secondary Treatment Expansion Program

About the STEP Labor-Management-Community Oversight Committee

Blue close up photograph of microorganisms

About the Wastewater Treatment Process

Contact

Debbie Caselton

Community Outreach

debbie.caselton@portlandoregon.gov

711Oregon Relay Service

Related offices, programs, and projects

The STEP Labor-Management-Community Oversight Committee

Aerial view of bridges over the Willamette River in Downtown Portland

Environmental Services

Photograph of a City of Portland truck being fueled at an RNG fueling station located at the Columbia Boulevard Wastewater Treatment Plant

Recovering Resources

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