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Compost Rebate

To encourage the use of compost, and to help meet statewide climate action goals, Zero Waste Sonoma (ZWS) is offering a 10% rebate for compost purchases totaling at least 20 cubic yards, up to $25,000 each fiscal year (Jul 1 - June 30). Compost greatly help to increase carbon sequestration, water retention, and the population of beneficial microbes in soil. In order to receive the rebate, please sign a short agreement consenting to the terms below.

Click to read and sign the agreement

Terms and Conditions

  • Only purchases made on the same day or after the agreement is signed are eligible for rebate.
  • Rebate claims must be submitted at least once annually. For purchases made within each of ZWS's fiscal years (Jul 1 - June 30), invoices must be submitted before the end of that same fiscal year to be processed.
  • Rebate is available for purchases totaling at least 20 cubic yards within ZWS's fiscal year. For example, if you purchase 10 cubic yards of compost in March and 10 cubic yards in April of the same year, the two receipts can be submitted together because they total more than 20 cubic yards.
  • The total amount of rebate shall be capped at $25,000 within ZWS's fiscal year for each applicant ("Provider" in the Agreement)
  • Compost must be spread in Sonoma County.
  • Compost must be purchased from an authorized compostable material handling facility (see more info below).
  • Proof of purchase must list the name of compost facility, date of purchase, and quantity (in cubic yards or tons) purchased.
  • A copy of W-9, dated within a year of compost purchase, is required for payment. Name on the W-9 must match the signed agreement.
  • Rebate may be claimed for the cost of compost only.
  • Compost derivatives (e.g., compost tea, potting mixes, and soil blends) are not eligible.
  • Costs outside of purchase (e.g., transportation and spreading) are not eligible.

Approved facilities

Compost shall be eligible for rebate only if purchased from a compostable material or green material handling operation or facility in California. Nearby local facilities include:

Farther facilities are also acceptable and may be identified using the state's Solid Waste Information System (SWIS) database using the following link. Under "Activities", the facility should list "compostable material handling operation" or "green material handling operation". https://www2.calrecycle.ca.gov/SolidWaste/Site/Search

Please note that the compost purchased must be spread within Sonoma County to be eligible for rebate. This ensures that the carbon sequestration benefits our soils and local communities.

Purchasing compost from a distributor and not directly from a compost facility? If the compost originates from an approved and permitted facility, as detailed above, the purchase will likely still qualify for rebate. Email xinci.tan@sonomacounty.gov if you're unsure.

Submit a Claim

Please make sure you have signed and submitted the Compost Rebate Agreement before submitting any claims.

Please provide the name to whom we will address the check.
Please provide the address to which we will mail the check.
In case of questions, this will be the primary method we will use to contact you.
In case of questions, providing a number may help to process your rebate more quickly.
Please provide your most recent W9 (dated within a year of the compost purchases) when submitting your first claim. WET SIGNATURES ONLY, no digital. Once we have it on file, you do not need to submit another W9 for all following claims in the same year. As a public agency, we require a W9 to transfer you public funds.
A receipt or invoice from the compost facility that includes name of the facility, date of purchase, and quantity (cubic yards) of compost purchased.

Questions? Suggestions for improvement?

Please contact Xinci Tan at xinci.tan@sonomacounty.gov or 707.565.1733.