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General Loop Information

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

See How Loop is Made

Visit one of King County’s treatment plants
Schedule a tour here

How’s our driving?

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

General Biosolids Information

Northwest Biosolids
206-477-5565
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