West Marin Compost is a community-driven composting facility located at 5575 Nicasio Valley Road in Nicasio, California. Established in 2012, it serves as a sustainable solution for organic waste management in Marin County, transforming yard debris and agricultural byproducts into high-quality compost and mulch products.

🌱 What They Do

West Marin Compost accepts clean green materials, such as yard trimmings and certain manures, diverting them from landfills to reduce methane emissions. The facility processes these materials into compost and mulch, which are used to improve soil health, conserve water, reduce erosion, and sequester carbon—supporting both local agriculture and environmental sustainability.​

🛠️ Products and Services

The facility offers a range of soil amendments, including:

  • Nicasio Blend: A premium compost made from yard trimmings, dairy manure, and horse manure, ideal for trees, shrubs, grapevines, and natives.

  • Marin Hi-Test Compost: Enriched with high-nitrogen manures, suitable for new gardens and overworked soils.

  • Marin Hi-Test Living Biochar: Combines compost with biochar to enhance soil fertility and carbon sequestration.

  • Vineyard Mulch: An organic alternative to bark, effective in weed suppression and moisture conservation.

  • Tree Mulch: Derived from tree stumps and logs, offering long-lasting ground cover.

  • Topper Mulch: A fully composted mulch that provides nutrients and is suitable for fire-safe landscaping.

  • Marin Amended Soil: A blend of clean soil and compost, ready for planting in raised beds or landscaping projects.

  • Marin Biochar: A soil amendment produced through pyrolysis, enhancing soil structure and nutrient retention.

  • Oyster Shell: Used to improve soil pH and calcium levels.​

📍 Location and Contact

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