Sonoma County property record for 18504 Riverside Dr, Sonoma, CA 95476
| Property Type | Duplex |
|---|---|
| Details | 5 bd · 3.5 ba · 2,860 sqft · built 1989 |
| Lot Size | 0.474 acres (20,650 sqft) |
| Owner | Trust Name on File |
| Last Sale | $380,000 (Sep 1999) |
| Tax Bill | $9,604 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 052-272-006-000 |
| Primary APN | 052-272-006-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 5 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 2,860 sqft Living Area |
| 1st Floor Area | 1,380 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1989 |
|---|---|
| Effective Year Built | Effective 1989 |
| Architectural Style | Custom Design |
| Construction Type | Wood |
| Lot Area | 20,650 sqft (0.474 acres) |
| Garage Area | 472 sqft |
| Cooling System | None |
|---|---|
| Heating System | Central |
| Old Parcel Number | 052-272-006 |
|---|---|
| Street Address | 18504 RIVERSIDE DR |
| City | SONOMA |
| State | CA |
| Zip | 95476-4525 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | R26UA |
| Legal Description | MAP 000031 00021 |
| Legal Subdivision | CRAIG ADDITION TO EL VERANO |
| Legal Block | 3 |
| Legal Lot Number | 5 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | SONOMA |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 150304 |
18504 Riverside Dr, a duplex, is owner-occupied and held in a trust since September 2010.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | PO BOX 648, EL VERANO, CA 95433-0648 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Sep 9, 1999 · Amount on File |
| Deed Sale | Sep 9, 1999 · Amount on File |
| Deed Document Number | 1999114404 |
| Last Transfer Date | Sep 21, 2010 |
| Transfer Doc | 0000082844 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 18504 Riverside Dr was $9,604 with a homeowner's exemption.
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Unified School District | Sonoma Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $595,725 (+2%) Land $156,764 Building $438,961 | |
| 2025 | $9,604.00 Homeowner's exemption | $584,045 Land $153,691 Building $430,354 |
| 2023 | $9,108.00 (+0.74%) Homeowner's exemption | $561,368 Land $147,724 Building $413,644 |
| 2022 | $9,041.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 18504 Riverside Dr in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
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 minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 10 (0% premium discount) |
| Nearby Flood Policies | 2 in force |
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.
Wildfire risk around 18504 Riverside Dr is low, with a 0.02% annual chance of wildfire.
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 | 0.02% 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 | VALLEY OF THE MOON WATER DISTRICT serves 23,140 people · EPA ID CA4910013 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Sep 2022 |
| Lead | Under 1 ppb (2024–2026) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None 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 625 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 in parts of the area | 100 / 20 |
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