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Water Treatment Plant
Our mission is to provide the citizens of Lake Oswego and Tigard with safe, pure, good tasting water at reasonable rates and adequate supply.
The Lake Oswego Tigard Water Treatment Plant produces high quality drinking water for more than 90,000 customers every day.
Lake Oswego's drinking water originates in the Clackamas River watershed.
Lake Oswego's drinking water is made pure and safe using a state-of-the-art treatment process known as conventional filtration, plus ozone. Read on to take a look inside the heart of the water treatment process.
Get to Know Your Drinking Water by reviewing the latest 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 City of Lake Oswego's Water Management and Conservation Plan guides the development, financing and implementation of water management and conservation programs and policies to ensure sustainable use, without waste, of publicly owned water resources while the City plans for its future water needs.