Sonoma County property record for 646 Donner Ave, Sonoma, CA 95476
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,782 sqft · built 2004 |
| Lot Size | 0.346 acres (15,067 sqft) |
| Owner | Company Name on Record |
| Last Sale | $2,985,000 (Sep 2005) |
| Tax Bill | $49,538 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 018-314-007-000 |
| Primary APN | 018-314-007-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 4 Rooms |
| Stories | 2 Stories |
| Building Area | 2,782 sqft Living Area |
| Gross Area | 3,370 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 2004 |
|---|---|
| Effective Year Built | Effective 2004 |
| Construction Type | Wood |
| Lot Area | 15,067 sqft (0.346 acres) |
| Garage Type | Attached |
| Garage Area | 588 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | HVAC |
|---|
| Old Parcel Number | 018-314-007 |
|---|---|
| Street Address | 646 DONNER AVE |
| City | SONOMA |
| State | CA |
| Zip | 95476-7132 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | MAP B3 180 |
| Legal Subdivision | EX PUEBLO OF SONOMA |
| Legal Block | 1 |
| Legal Lot Number | 76 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | SONOMA |
| Census Block Group | 1 |
| Census Block | 1015 |
| Census Tract | 150204 |
Source: Sonoma County records, as of September 1, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 190 PALO ALTO AVE, SAN FRANCISCO, CA 94114-2122 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Sep 20, 2005 · Amount on Record |
| Deed Sale | Sep 20, 2005 · Amount on Record |
| Prior Sale | Aug 22, 2003 · Amount on Record |
| Deed Document Number | 2005139380 |
| Prior Transfer Date | May 11, 1999 |
| Prior Transfer Doc | 0000063436 |
| Record Updated | Oct 29, 2026 |
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Municipality | Sonoma City |
| Unified School District | Sonoma Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $4,160,830 (+2%) Land $2,090,869 Building $2,069,961 | |
| 2025 | $49,538.00 (+7.22%) | $4,079,246 (+4.04%) Land $2,049,872 Building $2,029,374 |
| 2023 | $46,203.00 (+1.49%) | $3,920,846 Land $1,970,274 Building $1,950,572 |
| 2022 | $45,524.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective February 15, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 15 policies |
| Nearby Flood Policies | 15 in force |
| Nearby Flood Claims | 8 (1978–2025) |
| Claims Outside the SFHA | 6 of 8 |
| Most Recent Claim | Feb 2025 · rainfall accumulation |
| Claims by Event |
|
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CITY OF SONOMA serves 10,619 people · EPA ID CA4910012 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Jul 2024 |
| Lead | Under 1 ppb (2021–2023) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 1 last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 579 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber, Fixed Wireless in parts of the area | 100 / 20 |
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