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Virtual Master Composter Course - County of San Diego

The five-week Master Composter course provides training in the art and science of composting. Course includes weekly webinar meetings with Q&A, take-home lectures, a curated Facebook group, and more!


Become a Master Composter!

  • Minimize your carbon footprint by keeping food and yard waste out of the landfill, helping reduce harmful methane gas emissions.
  • Use this "waste" to create a nutrient-rich amendment for your garden. Compost use reduces the need for synthetic fertilizers and pesticides. 
  • Reduce water use and increase water retention. Compost increases your soil's water holding capacity by up to 7 times and retains water for up to 7 days.
  • Discover a wealth of composting options for all needs. Course will cover backyard (traditional) composting, composting with worms (vermicomposting), bokashi fermentation, and an array of associated sub-topics.

Virtual Course Format

  • Instruction will take place through a combination of live meetings with our instructors held through Zoom, and independent study.
  • Virtual, 1.5-hour weekly meetings will include dedicated Q&A time and live lectures from our instructors. 
  • Independent study will consist of assigned readings from our online course manual, pre-taped presentations from our instructors and guest speakers, and more!
  • We will offer a virtual field trip to observe a large-scale composting operation in action.
  • An optional curated Facebook group to share with and learn from others.

This class will meet Wednesdays from 6:30 - 8:00 PM

  • Week 1 - May 5
  • Week 2 - May 12
  • Week 3 - May 19
  • Week 4 - May 26
  • Week 5 - June 2

Master Composter certification requires attendance at all 5 classes, as well as 30 volunteer hours of related community service. Community service opportunities will be discussed during the course.

Course Fee: $25*

Unincorporated San Diego County residents will receive preferential registration. Residents of incorporated cities will be placed on a wait list and apprised of space available status 1-2 weeks before the start of the course. Please confirm that your home address is unincorporated BEFORE signing up for preferential registration. Enter your address here; you can receive priority registration only if your jurisdiction boundary is "S.D. COUNTY." 

*If the fee presents a financial hardship, please contact Diane Hazard at to apply for a scholarship. 

Made possible through generous funding by


Event Classification
Funding Source Contract-funded
Category Master Composter Class
Contract County Composting
Special Note
Stream to Volunteer Opportunities
May 5th, 2021 6:30 PM   through   June 2nd, 2021 8:00 PM
Virtual - Your Home Computer
United States
Main Phone: (760) 436-7986  ext. 700
Place of residence
Resident of Unincorporated County of San Diego - $25
Non-resident of Unincorporated County of San Diego - waitlisted; $25 upon acceptance

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