• Facts about the King County Regional Wastewater System 

• Annual Financial Statements (WTD)
• Ratepayer Report

• Near Neighbor , 2017
• Water Quality, 2017

• Treatment process diagrams
  • Brightwater Treatment Plant , 2018
  • Carnation Treatment Plant , 2021
  • South Treatment Plant , 2018
  • Vashon Treatment Plant , 2018
  • West Point Treatment Plant , 2018
• Loop Biosolids brochure
• Don't Flush Trouble flier (available in multiple languages)
• Endocrine Disrupting Chemicals in the Environment - brochure and insert , Oct. 2007
• Residential Relocation Program Brochure, Jan. 2010
• Education program materials

View documents on Responding to climate change.

• Better Than Promised: An informal history of the Municipality of Metropolitan Seattle, 1995
• Metropolitan Seattle Sewerage and Drainage Survey, 1958
• Multi-Agency Benchmarking Report, 1999
• Productivity Initiative, 2000-2011
• See also the Technical Document and Research Center

• WTD Strategic Plans
  • 2018 Strategic Asset Management Plan Update , December 2018
  • King County Biosolids Program Strategic Plan, 2018–2037 , June 2018
  • King County Recycled Water Program Strategic Plan, 2018–2037 , June 2018
  • King County Technology Assessment and Innovation Program Strategic Plan, 2018-2037 , June 2018
  • Wastewater Treatment Division Energy Plan, 2018-2025 , February 2018
• System Planning 
  • Clean Water Plan (launched 2019)
  • Regional Wastewater Services Plan (adopted 1999)
• Treatment Planning (wastewater flow and wasteload projections & study, nitrogen removal study)

• Capacity Charge - FAQs
• Combined Sewer Overflow Control (Protecting our Waters)
• Conveyance System Improvement
• Industrial Waste - forms, newsletter
• Mitigation and Monitoring (post-construction) - resources
• Regional Infiltration and Inflow Control
• Resource Recovery - Loop Biosolids, Energy, Recycled Water and Research and Technology
• Sediment Management
• Septage Disposal - permit
• Treatment Planning
• Wastewater (NPDES) Permits

Refer to library pages on capital projects.   

• Metropolitan Water Pollution Abatement Advisory 
• Regional Water Quality

The Technical Document and Research Center supports the mission of the Department of Natural Resources and Parks through the provision of research and current awareness services. The Technical Document collection consists of more than 5,000 technical reports produced by King County agencies, particularly the Department of Natural Resources and Parks and the Department of Transportation.

• WTD YouTube Channel
• Construction methods and sustainability
• Education:
  • Video lessons and virtual tours 
  • Brightwater Center: Video and Spoken Art

• WTD Operational Performance Metrics
• WTD Asset Management
• DNRP Publications
• Technical Document and Research Center
• King County Budget 
• King County Editorial Style Guide
• Public Records Officers
• WTD staff contacts

The National Association of Clean Water Agencies (formerly the Association of Metropolitan Sewerage Agencies) -- NACWA represents wastewater treatment agencies in developing environmental legislation and working with federal regulatory agencies to carry out environmental programs.

National Small Flows Clearing House -- The NSFC helps America's small communities and individuals solve their wastewater problems to protect public health and the environment.

Puget Sound Partnership -- The Puget Sound Partnership is a community effort of citizens, governments, tribes, scientists and businesses working together to restore and protect Puget Sound.

United States Environmental Protection Agency -- EPA's mission is to protect human health and safeguard the natural environment -- air, water, and land -- upon which life depends.

Water Environment Federation -- WEF is an international not-for-profit educational and technical organization of more than 40,000 water quality experts. Its mission: to preserve and enhance the global water environment.