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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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Tour the Treatment Plant


Environmental Services has temporarily suspended tours of the Columbia Blvd Wastewater Treatment Plant.



treatment plant tourColumbia Boulevard Wastewater Treatment Plant Tour Request

Take a guided tour of Oregon's largest wastewater treatment plant.

Use the form below to request a free tour. Call 503-823-2400 with questions or for more information.

Tour Information

  • Tours are on the third and fourth weeks of each month. 
  • On the third week they are on Tuesday and Thursday. On the fourth week they are on Wednesday and Friday.
  • Tour hours are 9:30 a.m. to 11:00 a.m. and noon to 1:30 p.m.
  • Tours last approximately 1.5 hours.
  • Treatment plant staff can accommodate tours for both individuals and groups of no more than 40 people.
  • Walking tours cover uneven surfaces, stairs and tunnels. Please dress appropriately and wear close-toed shoes.
  • Tours are suitable for grades 5 and up or ages 10 and older.
  • School groups (grades 5-12) must provide one adult chaperone for every ten students.

We will provide confirmation of your tour within one week of submitting your tour request.

Please note: Severe weather can disrupt treatment plant operations and may force tour cancellations. In the event of a cancellation, we will contact you to reschedule your tour.