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Public Works Maintenance operates and maintains 206 miles of collection system with 13 major pump stations and 14 single-family pump stations. All of these assets eventually flow into the Tryon Creek Wastewater Treatment Plant operated by the City of Portland on Foothills Road. Public Works Maintenance also provides information about rodent control, sewer odor complaints, lateral service connection verification, response to sewer back-ups and overflows, and missing manhole covers.
Phil Lawrence (503) 635-0280
Fats, Oils & Grease
Proper disposal of fats, oils and grease protects your business, public health, and the environment.
It's the law, and it's the right thing to do.
The Tryon Creek Wastewater Treatment Plant is aging and in need of major upgrades to continue to reliably meet Oregon Department of Environmental Quality water quality requirements. Lake Oswego, with Portland’s support, is planning to build a new, state-of-the-art wastewater treatment facility to replace the old plant.
If you suspect a sewer overflow call:
Public Works Maintenance at 503-635-0280 during working hours Monday-Friday, or after hours LOCOM at 503-635-0238.
City of Lake Oswego Sewer Overflows
Each home and business in Lake Oswego has a sewer lateral. It is the smaller (3 or 4 inch) pipe that collects the water and waste from your sinks, showers, toilet, tubs, and any other drains that carry the wastes from the home to the larger (8 to 36 inch) City of Lake Oswego Sewer Collection System.
To help control rats and rodents at your home, cover your garbage cans with a tight metal cover. If a can has holes in it, replace it with a new one. Store soap powder, dog food, rabbit food, nuts, and food in rodent-proof containers or in places inaccessible to rodents. Keep your yard clear of dog bones, old vegetables, fallen fruit, etc. Garbage and brush piles attract rodents.
If you have a sewer odor in your home, first look for the source in the bathrooms and kitchen. Pour a gallon of water down the shower drains and sinks that are not used often. If this does not solve the problem, call Sewer Maintenance at (503) 635-0280.
If you have a question about whether you are connected to the City sewer or a septic tank, we are able to check our records for you. If we are unable to find a record, we can perform a dye or smoke test for verification. Call Sewer Maintenance at (503) 635-0280 to arrange an appointment.
If you discover that a manhole cover is missing, overflowing, or rattling, please call Public Works Maintenance immediately at (503) 635-0280.
Lake Oswego's Interactive Maps allow the user to navigate the map by zooming in and out, search the map by address, tax lot number, or intersection, turn layers on and off, including aerial photography, click on a property or other features to obtain information, use tools to markup and print a map, use measurement tools, change maps to a selection of pre-set layers, and use quick links to
Lake Oswego’s Wastewater Master Plan was adopted in November 2012 and amended in 2019. The Wastewater Master Plan provides guidance on how to manage and operate the wastewater collection system within the city limits and the urban service boundary now and into the future.