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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

Odor Notification

  • Columbia Boulevard Wastewater Treatment Plant

  • Columbia Boulevard Wastewater Treatment Plant Dry weather clarifier odor control and treatment system

  • Portsmouth Ventilation Odor control and treatment facility

  • Influent Pump Station Odor control and treatment system

  • Columbia Boulevard Wastewater Treatment Plant Headworks odor control and treatment system

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Odor Notification Alert: May 9, 2019



We are taking Final Clarifier #8 out of service for maintenance work and upgrades to the spray water system. This clarifier will be offline from May 10 through May 30 while we are emptying, cleaning, and inspecting the clarifier. While we take this clarifier out of service, it is possible for odors to be produced. While we don’t anticipate these odors to be perceptible outside the confines of the plant, this is a possibility until cleaning is complete. We know these odors can be unpleasant and we make every effort to reduce them.

Odors produced from the collection system and wastewater treatment plant are captured and treated through a variety of processes. Occasionally, maintenance activities will hinder our ability the capture and treat these odors, allowing them to be perceptible in surrounding neighborhoods. Environmental Services issues notification regarding these maintenance projects that may result in odors outside the plant’s boundaries.


How to Report Odors

How to Get Odor Information

Subscribe to odor notification email

Click here to receive odor alerts by email

Go to the online odor report form

Fill out and submit this form online to let us know about odor problems

Tour The Treatment Plant

Request a tour of the Columbia Blvd Wastewater Treatment Plant.