King County depends on scientific scrutiny from reputable research institutions. Loop continues to be thoroughly evaluated by our research partners. 

Washington State University: Department of Crops and Soils

This program focuses on building soil productivity, supporting local agriculture, protecting water quality, and facilitating recycling of organic wastes by applying soil science principles to agricultural, development, and waste management issues. Among other scientists, Craig Cogger and Andy Bary from the WSU Puyallup research and extension center have been instrumental in studying the land application of Loop. Their recent work has examined Loop as a fertilizer replacement, as an ingredient in potting mixes and low impact development rain garden soil mixes, and soil carbon sequestration.

Visit the Department of Crops and Soils for more information.

University of Washington: School of Environmental and Forest Sciences

Decades of research on Loop by UW scientists has given us an understanding of the safety and benefits of its use in the forest environment. Their research has also been used to define best management practices, including composting. Studies have included tree growth, soil enhancement, and reclamation of degraded lands, as well as environmental effects like water quality, wildlife response, and carbon sequestration. Scientists like Sally Brown and Chuck Henry have been national leaders in researching forestry application, land application, composts, and soil carbon sequestration of biosolids, including Loop.

Visit the School of Environmental and Forest Science for more information.

Water & Environmental Technology Center

Supported by the National Science Foundation, the WET Center is an association of Temple University, the University of Arizona, and Arizona State University. The Center studies water quality, emerging contaminants, and technology for water and wastewater treatment. Prominent scientists at these universities, like Drs. Ian Pepper and Chuck Gerba, evaluate the potential effects of chemicals and microorganisms in biosolids and on land. Their work puts King County on the leading edge of biosolids management and helps to keep Loop safe and effective.

Visit the Water & Environmental Technology Center for more information.