Sonoma County Property Tax Rates by City, Area, and Tax District 2026
Sonoma County’s property tax picture varies by parcel and tax rate area. For 2024, the county’s median property tax was about $5,580, while the median effective property tax rate was approximately 0.7163%.
Effective Tax Rate
0.7163%
Median Property Tax
$5,580
Tax per $100K
$716.30
Last Update
August 2026
Sonoma County Property Tax 2026-27
Sonoma County Property Tax Rate
Sonoma County property tax rates vary by district in the provided data. Parcel bills can still include fixed charges, parcel taxes, CFD charges, or special assessments depending on the property.
Base rate
1.0000% general ad valorem tax.
District rates
Sonoma County district rates vary from 1.0000% to 1.4835% in the provided data.
Direct charges
Special assessments and parcel charges are added separately.
Area
Representative Rate
Cloverdale (City) District
1.1905%
Cotati (City) District
1.2150%
Countywide-Unitary Base Rate
1.0000%
Healdsburg (City) District
1.1120%
Petaluma (City) District
1.1865%
Rohnert Park (City) District
1.1945%
Santa Rosa (City) District
1.1735%
Sebastopol (City) District
1.1460%
Sonoma (City) District
1.0875%
State Unitary Utility Allocation
1.1390%
Unincorporated Area Baseline
1.0000%
Windsor (Town) District
1.1550%
Other Sonoma County Property Tools
Tax-rate information is more useful when combined with parcel and location details. California Property Checker provides related tools to help users research ownership, tax estimates, property location, zoning, and other information.
Sonoma County Property Search
Search property information by owner name, address, parcel number, city, ZIP code, or other available property details.
Sonoma Property Tax Calculator
Estimate potential annual property taxes using a property’s value and applicable tax-rate information.
Sonoma Doc Stamp Calculator
Estimate applicable documentary transfer tax or related charges associated with qualifying real estate document transfers.
Sonoma County Zoning and Maps
Explore parcel locations, maps, zoning information, boundaries, and other geographic details connected to a property.
How Property Tax Rates Are Applied in Sonoma County
The amount shown on a Sonoma County property tax bill is not determined by the countywide rate alone. The process starts with taxable assessed value, then applies the rates assigned to the property’s tax rate area. Additional voter-approved charges, special assessments, exemptions, and other adjustments can affect the final bill.
Assessed Value Is the Starting Point
California property taxation generally begins with a property’s assessed value rather than its current market value. Proposition 13 generally limits annual increases in the assessed value of an established property to 2%, subject to qualifying changes.
The Tax Rate Is Applied to Taxable Value
Once taxable assessed value is established, applicable ad valorem tax rates are applied to determine the core property tax obligation. Sonoma County properties can have different combined rates because their parcels belong to different taxing areas.
Tax-Rate Areas Combine Local Charges
A tax rate area identifies the combination of taxing jurisdictions that apply to a particular parcel. Depending on location, the area may include county government, a city, school districts, and special districts.
Special Assessments Can Increase the Bill
Not every charge on a tax bill is simply a percentage of assessed value. Certain special assessments, parcel taxes, direct charges, and voter-approved measures may appear separately and increase the total amount due.
Ownership Changes Can Trigger Reassessment
A qualifying change in ownership can establish a new assessed value under California law. This may produce a supplemental assessment and tax bill rather than waiting for the next regular annual assessment cycle.
Exemptions Can Reduce Taxable Amounts
Eligible property owners may qualify for certain exemptions or assessment adjustments. The availability and amount depend on the property and the applicable California requirements, so an exemption should not be assumed without confirming eligibility.
Why Sonoma County Has Different Tax Districts and Local Rates
Sonoma County includes incorporated cities, unincorporated communities, school districts, special districts, and other local jurisdictions. Because these agencies provide different services and may levy authorized charges, two nearby parcels can have different total property tax obligations.
- Fire protection, schools, water, and other services may cover specific portions of the county.
- Each parcel is assigned to a tax rate area reflecting the agencies that can levy applicable taxes.
- Properties may support different local services depending on their city, district, or unincorporated location.
- Two properties close together can fall into different school or special-district boundaries.
- Approved bonds and special taxes can increase the amount collected from properties within participating jurisdictions.
- The property’s exact location and assessment characteristics determine which rates and direct charges appear on its bill.
Check Property Tax Rates in Nearby California Counties
Comparing county-level tax information can help buyers, homeowners, investors, and researchers understand how property taxes differ across the North Bay and surrounding California markets. California Property Checker provides county-specific property information and tools for making those comparisons.
Frequently Asked Questions
Does buying a home in Sonoma County cause reassessment?
Generally, a qualifying change in ownership can trigger reassessment under California law. The assessor may establish a new assessed value based on the applicable rules, which can change future property tax obligations.
Can a property’s assessed value increase by more than 2%?
The normal annual adjustment to an established Proposition 13 base-year value is generally limited to 2%. However, a qualifying change in ownership, new construction, or another reassessment event can establish a new taxable value.
What is a supplemental property tax bill?
A supplemental bill covers the difference between the previous assessed value and a new assessment resulting from a qualifying ownership change or new construction. It is separate from the regular annual property tax bill.
When are Sonoma County property taxes due?
California secured property taxes are generally collected in two installments. The first installment is due November 1 and becomes delinquent after December 10, while the second is due February 1 and becomes delinquent after April 10, subject to statutory adjustments.
What happens if property taxes are paid late?
Unpaid secured property taxes can become delinquent and may result in penalties and additional collection consequences. Property owners should verify the amount due and applicable deadlines with the county tax collector.
Can I challenge my property’s assessed value?
A property owner who believes the assessed value is incorrect may have an opportunity to request an assessment review or file an assessment appeal. Filing periods and procedures depend on the type of assessment involved.
Does remodeling a Sonoma County property increase property taxes?
Improvements can affect assessed value when they constitute qualifying new construction. Routine repairs and maintenance generally receive different treatment from improvements that add taxable value, so the specific project matters.
Are homeowners eligible for a property tax exemption?
Some homeowners may qualify for exemptions under California law, including the homeowners’ exemption for an eligible principal residence. Eligibility requirements apply, and the exemption must be properly claimed.
Where can I verify my actual property tax bill?
The official county tax collection records are the appropriate source for confirming an actual tax bill, payment status, installment amounts, penalties, and parcel-specific charges. A calculator or effective rate should be treated as an estimate rather than a bill.
Why can my actual tax bill differ from an estimated calculation?
An estimate may use an effective countywide rate, while the actual bill reflects the parcel’s assessed value, tax rate area, special assessments, direct charges, bonds, exemptions, and other applicable factors. For that reason, estimates should not be treated as exact bills.