Water Treatment Plant
Lake Oswego's drinking water originates in the Clackamas River watershed.
The Lake Oswego Tigard Water Treatment Plant produces high quality drinking water for more than 100,000 customers every day. Lake Oswego's drinking water is made clean and safe using a state-of-the-art treatment process known as conventional filtration, plus ozone. Take a look inside the heart of the water treatment process.
Interested in learning more about your drinking water? Take a behind-the-scenes tour of the Lake Oswego-Tigard Water Treatment Plant, located in West Linn!
Tours are held about once a month between spring and early fall, take approximately 1 ½ hours and are limited to 15 people per tour.
Clean drinking water is an essential resource we rely on every day. Providing residents and businesses in Lake Oswego with safe, dependable, high-quality water is our top priority.
Lake Oswego’s tap water meets or exceeds every State and Federal standard for safe drinking water. Get to know your drinking water by reviewing the latest 2024 Water Quality Report.
Here are some tips on how to prepare for an emergency, how to treat water in an emergency, and how to prevent, prepare, and respond to freezing or burst pipes.
The Water Management and Conservation Plan for the City of Lake Oswego and the City of Tigard was created to document the development and implementation of water management and conservation policies and programs that ensure sustainable water use for the community members of both cities.

Water Treatment Plant: (503) 635-0394