Unified Sewer Plan

Unified Sewer Plan

The Unified Sewer Plan is a document required of counties who provide sanitary sewer service to their residents. The plan includes the general location and description of sewer utility facilities, our sewer service area, and the six-year capital improvement plan.

Pierce County's update to the Unified Sewer Plan was approved by the Pierce County Council and the Washington State Departments of Health and Ecology in October 2012.

You can review Pierce County's Unified Sewer Plan using the links below.

2010 Unified Sewer Plan Update

Section 1 - Introduction and Policies

Section 2 - Planning Criteria and Methods

Section 3 - Physical and Environmental Inventory

Section 4 - Chambers Creek Wastewater Treatment Plant Existing Treatment

Section 5 - Existing Collection System

Section 6 - Fertilizer, Biosolids, and Reclaimed Water Management

Section 7 - Future Expansion and Improvements

Section 8 - Capital Facilities Plan / Sewer Improvement Program


Appendix A - Glossary of Terms

Appendix B - Environmental Documents

Appendix C - Demand Management

Appendix D - Summary of Interlocal Agreements

Appendix E - Pierce County Wastewater Utility Legislative History

Appendix F - Basin Review Committee

Appendix G - Summary of Plans and Policies

Appendix H - Coordination with Cities, Towns, and State Reviewing Agencies

Appendix I - Issue Briefs

Appendix J - Collection System Hydraulic Modeling Summary

Appendix K - Conveyance Inventory

Appendix L - Recommended Sanitary Sewer Improvements

Chambers Creek Regional Wastewater Treatment Plant Facilities Plan

This Facilities Plan is an important element of the Unified Sewer Plan that focuses on the wastewater treatment plant. The Facilities Plan evaluates alternative approaches for wastewater treatment at the plant to satisfy long-range needs within the Sewer Utility service area. This plan also helps the Sewer Utility to stay on track in meeting the requirements of our National Pollutant Discharge Elimination System (NPDES) permit.

You can review Pierce County's Chambers Creek Wastewater Treatment Plant Facilities Plan using the links below.

Facilities Plan

Chapter 1 - Sewer Utility Mission and Vision

Chapter 2 - Sewer Utility Levels of Service

Chapter 3 - Utility Background and Asset Inventory

Chapter 4 - Population, Flow, and Loading Projections

Chapter 5 - Regulatory Environment

Chapter 6 - Facility Needs and Level of Service Comparison

Chapter 7 - Alternative Development

Chapter 8 - Environmental Impact Statement

Chapter 9 - Recommended Level of Service Selection

Chapter 10 - Financial Impacts and Strategy

Chapter 11 - References

Chapter 12 - Report Limitations


Appendix A - Preliminary Geologic Study

Appendix B - Preliminary Report: Geologic Study and Geotechnical Study

Appendix C - Technical Memorandum: Shallow Aquifer Capacity Assessment

Appendix D - Technical Memorandum: Reclaimed Water Market Assessment

Appendix E - NPDES Waste Discharge Permit No. WA 0039624

Appendix F - Puget Sound Clean Air Agency Evaluation Report

Appendix G - Staff-Directed Facility Needs Assessment

Appendix H - Non-Process Needs Assessment Study

Appendix I - Master Plan Stakeholder Interviews, Summary Findings, and Customer Research Survey Summary Report

Appendix J - Capital Cost Estimates

Appendix K - Operation and Maintenance Cost Estimates

Appendix L - Business Case Evaluations Details

Appendix M - Planning Design Data Sheet

Appendix N - R&R Cost Schedule for Proposed CIP Project Assets

Appendix O - Plant RPM R&R Model: Existing Assets not included in the RPM R&R Model

Appendix P - Total Capital Project Costs - Collection System and Carrying Costs

Appendix Q - Outfall Modeling