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Resource Recovery

Creating resources from wastewater

For more information about Resource Recovery, please send us an email message or contact us at:

King County Wastewater Treatment Division
Resource Recovery
201 S. Jackson Street
Mail Stop: KSC-NR-0512
Seattle, WA 98104
Phone: 206-477-5557
Fax: 206-684-2057

  • biosolids in agriculture

    The Biosolids Management Program

    Ever since the passing of the Clean Water Act in 1972, King County has produced biosolids. From those early days, King County's Biosolids Management Program has been an industry leader working with researchers and community partners to study the land application of biosolids.


    Now, in recognition of the many benefits biosolids provides, King County biosolids are now known as Loop, a highly sought-after nutrient-rich soil amendment and a key ingredient in GroCo compost.

  • RWcontainer

    The Reclaimed Water Program

    Since 1997, WTD has used reclaimed water for industrial uses at the treatment plants – effectively saving $650,000 on annual water bills and millions of gallons of drinkable water.


    With three treatment plants now producing high-quality Class A reclaimed water in King County, soon it will be made more available for local customers as irrigation and industrial process water. The advancement of reclaimed water technology and infrastructure allows the Reclaimed Water Program to reduce the reliance on Puget Sound for water disposal.

  • energy audit

    The Energy Program

    Before there was a climate change imperative to reduce reliance on fossil fuels, WTD incorporated numerous energy conservation measures and incorporated renewable fuel alternatives.


    In 2009, WTD saw the need to approach future efforts with strategic partnerships and data-driven decisions, hence the establishment of the Energy Program. Supported by real-time data collection, system-wide audits and generous grant funding, the Energy Program is able to guide WTD soundly through today's critical era of energy management.

  • biomembrane filters.

    The Technology Assessment Program

    For more than 20 years, the Technology Assessment Program has evaluated advances in wastewater treatment technology, concentrating on innovations that promise to improve performance or reduce costs.


    The Technology Assessment Program reviews new technologies, studies existing processes, performs laboratory research, and administers pilot studies or demonstration-scale equipment testing. Partnerships with university scientists provide cost and information-sharing benefits.

Creating Resources From Wastewater

 A growing number of communities around the world grapple with environmental challenges of scarce natural resources, foul air, and polluted waterways. But thanks to decades of research, many have recognized value hiding in urban waste streams and are developing safe and effective products captured from the wastewater treatment process.

King County's Wastewater Treatment Division (WTD) treats an average 175 million gallons of wastewater per day at three regional plants and two satellite plants. The Resource Recovery section manages the administration and distribution of locally made Loop (King County biosolids), reclaimed water, and biogas. Click here to learn how we measure our performance on meeting Resource Recovery goals.