Unified Sewer Plan Update

 Envisioning our future sewer system
Pierce County Unified Sewer Plan

Wastewater Treatment facilities around Puget Sound face regulatory and environmental pressures to develop, implement, and improve wastewater treatment processes to meet increasing water quality regulations for effluent discharge.

The Unified Sewer Plan will reflect Pierce County’s ongoing commitment to a healthy Puget Sound and our goals of supporting vibrant communities, effective government and economic growth.

 About the Plan

What is the Unified Sewer Plan?

 Pierce County Planning and Public Works is currently updating the Unified Sewer Plan, which is a comprehensive plan that will guide the Division for the next 20 years. The plan describes the sewer service area, existing collection and treatment system and outlines policies, goals and approached that will guide future expansion and improvements. 

The Unified Sewer Plan will also address elements required by the Department of Ecology, including the general sewerage planning, expansion of sustainability, resource recovery efforts (biosolids and biogas management), and improved treatment to reduce nutrients in outflow.

The first Unified Sewer Plan was adopted by Pierce County in 2001 and a minor update was completed in 2010. The update will address regulatory changes that have been made since the 2010 update and will explore improvements to existing sewer, water and energy lines of business.


  • Support growth and economic development in Pierce County
  • Meet customer expectations of balancing investment value with the health of Puget Sound
  • Facilitate ongoing compliance with current and future regulatory requirements
  • Address regulatory changes that have been made since the last update in 2010 and will explore improvements to existing sewer, water and energy services

Contact Us

Windy Kruse
Project Manager
[email protected]

Information Center

We want to hear from you!

Written comments may be submitted: 

Pierce County Planning and Public Works
Attn: Windy Kruse, Project Manager
Environmental Services Building
9850 64th St. W.
University Place, WA 98467

Stay tuned for details about upcoming opportunities to get involved.


As part of developing the Unified Sewer Plan, Sewer Division staff will engage with ratepayers, elected officials, tribes, stakeholders, and regulators to understand their expectations and to develop strategies for how best to balance those expectations while maintaining affordable rates.

Our business case evaluations will include consideration of the environment and social awareness to the standard cost/benefit/risk analysis, and address sustainability, sewer capacity, resource recovery and wastewater treatment byproducts (such as biosolids, biogas and nutrient reduction).

Policy topics for future consideration include:
  • Strategies for providing sewer service
  • How we finance future growth
  • Anticipated changes to regulations
  • Sustainability and environmental stewardship
  • Opportunities for partnerships/regionalization of services such as Biosolids Management
  • Evaluation of other services, such as water and energy
  1. Process
  2. Phase 1 (2020-2021)
  3. Phase 2 (2021-2022)
  4. Phase 3 (2022-)

Pierce County launched the USP update project in March of 2020 and expects to finalize the plan in 2022. Stakeholder engagement will assist in initial plan development, analysis and environmental review of alternatives. The Pierce County Council and Department of Ecology have approval oversight of the final plan. See below for more detail about the timing and goals for each phase.