Lake Oswego Tigard Water Treatment Plant

    A large plant modernization and expansion in a suburban neighborhood, the Lake Oswego Tigard Water Treatment plant features 11 new buildings that replace a 1960’s vintage plant. The sustainable and seismically resilient treatment plant expansion triples the plant capacity within a limited footprint using new technologies, including high rate clarification, biological filters, and new solids facilities.


    Facing challenges ranging from community opposition to adverse soil conditions, the city relied on MWA to site and design buildings providing a contextual neighborhood interface at plant edges, and consolidating more industrial process facilities to the center of the property. MWA and MWH produced a Good Neighbor Plan which included many public and one-on-one meetings listening to neighbors in order to address concerns with this plant expansion in the quiet residential area.

    Park-like amenities include public access, walking trails and lush landscaping
    Serving as the public face for the facility, the administration, operations, and laboratory building is the main plant entrance for visitors and staff
    The exterior makes use of a natural palette of brick, wood, and Swisspearl accents
    Generous views of the wooded surroundings are provided for staff and plant operators
    Process facilities like the finished water pump station are designed for both function and operator comfort and provide ample natural light through use of windows and skylights