Sonoma County property record for 18643 Riverside Dr, Sonoma, CA 95476
| Property Type | Duplex |
|---|---|
| Details | 2 bd · 2 ba · 920 sqft · built 2008 |
| Lot Size | 0.215 acres (9,350 sqft) |
| Owner | Company Name on Record |
| Last Sale | $183,000 (Feb 1994) |
| Tax Bill | $7,680 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 052-281-016-000 |
| Primary APN | 052-281-016-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 2 Rooms |
| Units | 2 Units |
| Stories | 1 Story |
| Building Area | 920 sqft Living Area |
| 1st Floor Area | 920 sqft |
| Year Built | Built 2008 |
|---|---|
| Effective Year Built | Effective 2009 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 9,350 sqft (0.215 acres) |
| Garage Type | Attached |
| Garage Area | 400 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | None |
|---|
| Old Parcel Number | 052-281-016 |
|---|---|
| Street Address | 18643 RIVERSIDE DR |
| City | SONOMA |
| State | CA |
| Zip | 95476-4510 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | R15UA |
| Legal Description | BLK 1 LOT 4,5 |
| Legal Subdivision | RIVERSIDE ADD TO THE SONOMA VISTA TRACT |
| Legal Block | 2 |
| Legal Lot Number | 4,5 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | SONOMA |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 150304 |
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 | 18643 RIVERSIDE DR, SONOMA, CA 95476-4510 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Feb 10, 1994 · Amount on Record |
| Deed Sale | Feb 10, 1994 · Amount on Record |
| Deed Document Number | 199419684 |
| Last Transfer Date | Apr 5, 2010 |
| Transfer Doc | 0000029482 |
| Record Updated | Oct 29, 2026 |
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 | $409,055 (+2%) Land $120,089 Building $288,966 | |
| 2025 | $7,680.00 (+5.97%) Homeowner's exemption | $401,035 (+4.04%) Land $117,735 Building $283,300 |
| 2023 | $7,247.00 (+4.36%) Homeowner's exemption | $385,464 Land $113,164 Building $272,300 |
| 2022 | $6,944.00 |
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 minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 10 (0% premium discount) |
| Nearby Flood Policies | 8 in force |
| Nearby Flood Claims | 2 (2005–2017) |
| Most Recent Claim | Feb 2017 · Severe Winter Storms, Flooding, And Mudslides |
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 | 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 718 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 |
| Starlink Satellite | 280 / 30 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: T-Mobile.
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