Eureka Producer's Cooperative is a hay marketing cooperative made up of thirteen hay growing families who live and farm in Diamond Valley. These producers grow very high quality hay products, and the cooperative markets approximately 20,000 tons of high value hay per year. Eureka Producer's Cooperative has been in business for over thirty years and markets a variety of hay products throughout the world. In addition, the cooperative owns and operates a 70 foot pubic scale which is used for the member and non-member hay weighing..

There are three main hay products marketed by the Eureka Producer's Cooperative: alfalfa, timothy grass, and alfalfa/grass mixes.