Lake Oswego, with Portland’s support, is replacing the aging 1964 Tryon Creek wastewater treatment plant with a new facility designed to provide reliable service, improve water quality, and withstand seismic and flood events for generations to come.
Virtual Community Information Sessions
Join project team members on Wednesday, September 16 or Thursday, October 1 from 6pm-8pm for a virtual community information session to learn the latest updates about the project, proposed rate increases, and next steps. Both sessions will be recorded and available on the project webpage as webinars shortly after.
Register in advance for a session here: https://www.lakeoswegowastewaterfacility.org/get-involved-2/
Rate Increases Expected
A rate increase is needed to help fund this essential investment. During their September 1 meeting, Lake Oswego City Council evaluated two rate options:
🔹 28% increase in 2027 followed by annual adjustments of about 3.9% — approximately $25–$30 more per month for an average customer.
🔹 8% annual increase for 10 years followed by annual adjustments of about 3.9% — approximately $8 more per month for an average customer. This option becomes more expensive after about five years.
Council is expected to decide which approach to take at their October 13 meeting. The revised sewer rate would go into effect on July 1, 2027 for Lake Oswego utility customers.
For more information, you can also view our FAQ page.