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General Loop Information

King County Wastewater Treatment Division
Resource Recovery Section – Biosolids
206-477-5557
Email Us

See How Loop is Made

Visit one of King County’s treatment plants
Register for upcoming events and tours

How’s our driving?

For feedback about our trucks
Provide truck number and time
(800) REPORT-9

General Biosolids Information

Northwest Biosolids
206-471-0460
Email Northwest Biosolids

Where to Buy Loop in the Puget Sound Region

GroCo Compost made with Loop
Sawdust Supply Company
206-622-4321
Email Sawdust Supply

Douglas County

Boulder Park Inc.
509-683-1142

Yakima and Neighboring Counties

Natural Selection Farms
509-837-3501
Email Natural Selection Farms

Loop Store

Visit our store