Sonoma County just stamped a very big number on its property tax books: an annual assessment roll of $131.7 billion, certified today. That figure reflects another year of rising assessed values across the county and will help shape how property tax dollars get sliced up among schools, cities and special districts.
County posts the number
According to the County of Sonoma, the newly certified assessment roll now totals $131.7 billion. In announcing the figure, county officials emphasized that revenue tied to the roll supports essential public services and a wide range of community programs and benefits, a reminder that those abstract billions are what keep local government operations running.
🏡💰📈Sonoma County’s annual assessment roll has reached $131.7 billion, reflecting continued strength and growth in local property values across the region. Read more: https://t.co/EJEugIBTtQ pic.twitter.com/LKJJYA89GV
— County of Sonoma (@CountyofSonoma) July 2, 2026
How this compares with last year
The latest total edges past last year’s gross roll, which the Clerk-Recorder-Assessor certified at about $131.5 billion for the 2025-26 assessment year, with net taxable value near $127.0 billion, according to the office’s memorandum to the Board of Supervisors. The Sonoma County Clerk-Recorder-Assessor also reported that the 2025-26 roll reflected a 5.44% increase over the prior year as staff worked through a backlog of assessments on properties rebuilt after recent fires.
Why the roll can grow even when sales cool
The assessor’s memo explains that the 2025-2026 assessment roll includes a 2% Consumer Price Index factor, and that automatic inflation bump nudges many parcel values higher year after year under Proposition 13 even if the real estate market is not roaring. County and state rules treat restorations of properties that were previously reduced under Proposition 8 differently as well, allowing assessments to be brought back up to market levels once damaged homes or buildings are rebuilt.
The State Board of Equalization’s property tax calendar notes that assessed values are locked in as of the January 1 lien date, the annual snapshot that feeds directly into the roll.
What it means for budgets and homeowners
A larger assessment roll expands the property tax base that funds the county, its cities, local schools and special districts. That does not automatically translate into a steep bill for every homeowner, since most long-time owners are capped at a 2% annual increase unless a sale or major new construction triggers a fresh reassessment under state law.
Sonoma County supervisors approved a roughly $2.9 billion budget for the 2026-27 fiscal year in June, and local reporting indicates that steady property tax growth is one of the revenue pillars built into that plan. Sonoma Valley Sun Detailed line items and projections are laid out in the county’s online budget portal.
How to check your property’s assessment
Property owners who want to see how their own parcel fits into that $131.7 billion total can review assessed values or learn about appeal options through the county. The Assessor’s office posts assessment information and guidance on its website once the roll is certified, and staff can provide instructions on key deadlines and forms for anyone considering a challenge.
