loop

General Loop Information

King County Wastewater Treatment Division
Stewardship and Sustainable Resources Section
206-477-5557
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Stay in the Loop

Sign up here for Loop news and updates

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
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Where to Buy in the Puget Sound region

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

Boulder Park Inc.
509-683-1142

Yakima and Neighboring Counties

Natural Selection Farms
509-837-3501
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Loop Store

Visit our store