Cal Poly Certified Organic Compost


We are pleased to announce that Cal Poly Compost is Certified Organic through CDFA's Organic Input Materials Program(California Department of Food and Agriculture). Cal Poly compost is a member of the  US Composting Councils Seal of Testing Assurance Program.
Click on the Video from CDFA for Cal Poly Compost below:

Compost Video


Compost for Sale

Cal Poly Organic Compost is available for sale in bulk  quantities or by the bag.  Cal Poly Compost is sold year round but is typically purchased during the Spring and Fall to add soil amendment for gardens, lawns & flower beds.  

Bulk compost is available for $40 per yard.  Please call ahead so we can schedule a time for you to come pick up your compost.

Certified Organic Compost can be purchased by the bag at the Cal Poly Plant Shop for $8 plus tax. Please check the website at for availability.

For Further information call:  756-2563


Enter Campus on Highland, Turn left on Mount Bishop, stay to the right on to dirt road and follow signs up to compost unit.


Cal Poly Compost Production

Cal Poly began on-campus composting operations during the 1990s. Initially, the operations relied on static piles to compost manure. In 1997, Dr. Doug Willimas initiated windrow composting operations, which developed into an enterprise project with the BioResource and Agricultural Engineering Department. As the composting operations expanded and required increased management, they were assigned to the Agricultural Operations Department.  Today, under the guidance of department staff and supervision of student employees, the compost unit processes over 7,000 cubic yards of manure and 3,500 cubic yards of green waste and wood chips into 3,500 cubic yards of finished compost

The composting operations process livestock manure from the dairy, beef evaluation center, beef unit, equine center, and poultry unit and incorporate the green waste generated from campus landscaping. In 2011 the Cal Poly composting operations became members of the U.S. Composting Council's Seal of Testing Assurance Program.


As part of Cal Poly's Water Quality Management Plan, Agricultural Operations is responsible for maintaining the confined livestock operations on the campus farm. This involves manure management of both solids and liquids. Solids are removed routinely and composted or spread on approved fields and pastures identified in the water quality management plan.  Liquids are captured within lagoons atseveral of the animal units. The accumulated lagoon water is then utilized as an irrigation resource on fields and pastures approved within the water quality management plan. Associated with the use of both lagoon water and lagoon solids are specific quarterly water quality monitoring requirements designed to ensure proper use and monitoring of ground water resources.

Center for Sustainability:

U.S. Composting Council:

CDFA: California Department of Food and Agriculture:


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