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Water Treatment Plant
Our mission is to provide the community members of Lake Oswego and Tigard with safe, pure, good tasting water at reasonable rates and adequate supply.
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.
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 2023 Water Quality Report!
During an emergency, such as a major earthquake, the City of Lake Oswego may issue a "boil water notice" until it can verify that the water is not contaminated and is safe to drink. During a "boil water notice" period, any water used for drinking or food preparation should be boiled at a full rolling boil for at least one full minute.
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.
Compare our water to others or read about water rules and regulations by checking out these water links.