Skip to main content

Loop biosolids

Turn your dirt around

Loop® is our biosolids product. It is an endlessly renewable resource. For more than 40 years, it has recycled the nutrients in our food back to the land the same way nature does. Loop is a fertilizer alternative produced by cleaning, recycling, and transforming wastewater into biosolids. We use it on farms and forests to generate healthier, more productive soil that increases crop yields and boosts tree growth. As a natural soil builder, Loop improves soil structure and acts like a sponge, helping soil retain water and nutrients for plants while preventing runoff into rivers and streams.

The Washington State Department of Ecology classifies biosolids as a beneficial resource and requires wastewater treatment facilities to keep biosolids out of landfills. Here in King County, we continue the legacy of using 100% of Loop.



For more information about Loop and its positive impacts, visit