Compost
Compost is a nutrient-dense soil amendment, made from decomposed plant matter and food waste, that can be applied to soil to improve its fertility and moisture retention. Compost not only improves soil and plant health, but it also promotes carbon sequestration, which is the process by which carbon dioxide is drawn down from the earth’s atmosphere and stored in the soil and plants that grow from the soil.
Composting organic items like food scraps and yard waste is not only a great way to reduce the amount of waste we send to the landfill, but it’s also easy! Plus, it is now California law that most residences, and businesses generating two cubic yards or more of waste (recycling + organics recycling + disposal), participate in organic waste diversion and/or curbside compost collection. Contact your hauler to set up a composting program or to request assistance, such as sorting trainings and signage.
How to Start Composting
Resources to help you compost at home, in your backyard, and at work.
The Latest News & Events
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The County of San Mateo Sustainability Department is hosting a free tire recycling drop-off event for San Mateo County residents. There is a limit of 9 passenger or light truck tires per vehicle, as required by state law. Tires accepted at this event must be size R19.5 or smaller, with or without rims. Please ensure the tires are deflated. Tires from commercial, auto repair, and/or salvage businesses will not be accepted.
- Location: 1 Library Ave, Millbrae, CA 94030
- Date: August 22, 2026
- Time: 10:00 AM – 2:00 PM
- Collector: San Jose Conservation Corps
Questions?
- Call 888-442-2666
Residents must provide proof of residency in San Mateo County (e.g., driver’s license, utility bill, garbage collection bill, etc.).
For larger truck tires (tractor, truck etc.) contact the Sustainability Department at 888-442-2666 for recycling location information or visit www.recyclestuff.org.