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Composting - worm

Worm composting or vermicomposting is the practice of using worms to make compost. The word vermi is the Latin word for worm, and worms like to feed on slowly decomposing organic materials (e.g., vegetable scraps). The end product, called castings, is full of beneficial microbes and nutrients, and makes a great plant fertilizer.

Hours listed on this page may change without notice.

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  • Board Meetings
  • Conferences and Workshops
  • E-Waste
  • Household Hazardous Waste
  • Mattress Recycling
  • Other
  • Outreach
  • Disposal Site


Mass Wiggle

6155 Lakeville Highway
Petaluma, CA 94952

NotesBulk worm castings available for sale. Visit the website to order, or call or email Dave for a tour of his facilities.

Sonoma County Master Gardeners

NotesMaster Gardener volunteers are trained and certified by the University of California Cooperative Extension. Call or email your home composting questions.

Sonoma Valley Worm Farm

1777 Watmaugh Rd
Sonoma, CA 95476

NotesRed wriggler worms, worm castings, and vermi-extract for sale. See website for more information or call to place an order.

The Compost Club

NotesOrganization assists schools and businesses in setting up vermicomposting systems. Visit the website for more info and educational resources..