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

Columbia 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.