Water Treatment Plant Expansion

Project Description

The City of Arlington will be expanding its water treatment capacity with the addition of additional filtration units.  The additional filtration unit will be located in a new filtration building that will be constructed on the site of the old water treatment plant filtration building.

Project Benefits

  • Increase water filtration capacity
  • Support City’s growing water demand
  • Maintain high quality water production

Project Cost and Funding

  • Engineer’s Estimate: TBD
  • Funding source:
    • City of Arlington Utility Fund

Project Schedule

  • Designed by: BHC Consultants
  • Estimated Construction: TBD

Coordination with Residents

Progress updates will be provided by the City on this project webpage to keep local residents and businesses apprised of the project progress. 


If you have questions or concerns on this project, please contact the City Project Hotline at 360-403-3544 or cityprojects@arlingtonwa.gov.

Photo 1

Project Documents

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Project Updates

  • Sept 16, 2021 - Design awarded to BHC Consultants
  • October 28, 2022 - Asbestos Abatement to begin week of November 7th. 
  • August 8, 2023 - WTP at 30% design, Working with Snohomish PUD to underground overhead electric wires serving Utility Plant in order to proceed with old plant demolition.