Lake Oswego Water Treatment Plant

Facility Description

The City of Lake Oswego has operated a drinking water treatment plant in West Linn’s Robinwood neighborhood since 1968. The Lake Oswego Tigard Water Partnership plans to upgrade and expand the treatment plant, located between Kenthorpe Way and Mapleton Drive, to meet current and future drinking water needs. The upgraded plant will supply Lake Oswego and Tigard, and will continue to serve as West Linn’s sole source of emergency and backup water supply.

History of the Water Treatment Plant

Built in 1968, Lake Oswego’s water treatment plant was originally located in unincorporated Clackamas County. The area was later annexed by West Linn. Through its 44-year history the plant has earned a reputation as a good neighbor. The City of West Linn has approved land use applications for upgrades and expansions three times since the plant was built.

It is not uncommon for wastewater and water treatment plants to be located in residential areas. South Fork Water Board’s treatment plant – jointly owned by West Linn and Oregon City – is located in Oregon City’s Park Place neighborhood. Extensive upgrading, expansion and treatment modifications have occurred there over the past several years to serve the two communities.

Water Treatment Plant – Good Neighbor Plan

Lake Oswego Tigard Water Partnership began discussions with the Robinwood Neighborhood Association in early 2010, sharing details of the water treatment plant expansion, listening to suggestions, and finding ways for the upgraded water plant to continue to be a good neighbor. Two years later, the Partnership has met with Robinwood neighbors more than 20 times, developing a Good Neighbor Plan (pdf, 308 kb) that contains the Partnership’s commitments for design–construction–operations of the new facility. Neighborhood input played a big role in design concepts with the addition of numerous plant layout changes and amenities requested by neighbors.


How to Get Involved

  • Click here for upcoming meeting dates.
  • Sign up to receive email notices.  Mark the ‘Water Treatment Plant' as your interest.
  • Click here to contact us by email.
  • Call the Water Hotline (503) 697-6502.

Additional Information

You can find regular updates on the Work Underway page.

Field Updates

Wednesday - November 26, 2014

West Linn Pipeline Construction Update

Asphalt saw-cutting

Construction updates include all current or upcoming pipeline work for the project in West Linn.

  • Highway 43 pipeline construction - expected to start in West Linn around mid-Dec.
  • Neighborhood Construction Meetings - next meeting Dec. 2

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Friday - November 21, 2014

Water Treatment Plant Construction Update

Auger cast pile drilling resumed this week.

Chemical storage tanks

Utility work on Kenthorpe Way - expected to start next week

Portland General Electric (PGE) is expected to start installing the alternative electrical feed to the water treatment plant on Kenthorpe Way next week. Work is expected to take about four weeks to complete.

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Friday - November 14, 2014

West Linn Pipeline Construction Update

Construction updates include all current or upcoming pipeline work for the project in West Linn. Read below for specific information on the following:

  • Horizontal directional drilling and Mapleton Drive pipeline work
  • Highway 43 pipeline construction - expected to start in early December in West Linn
  • Neighborhood Construction Meetings - next meeting Nov. 18

Read More