Oregon Tilth is a nonprofit organization supporting and promoting biologically sound and socially equitable agriculture through education, research, advocacy, and certification. Oregon Tilth advocates sustainable approaches to agricultural production systems and processing, handling and marketing.
Oregon Tilth's purpose is to educate gardeners, farmers, legislators, and the general public about the need to develop and use sustainable growing practices that promote soil health, conserve natural resources, and prevent environmental degradation while producing a clean and healthful food supply for humanity. Here is what they are all about..

http://www.tilth.org/