Sonoma County property record for 18423 Riverside Dr, Sonoma, CA 95476
| Property Type | Duplex |
|---|---|
| Details | 2 bd · 1 ba · 782 sqft · built 1946 |
| Lot Size | 0.316 acres (13,780 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $669,000 (Apr 2021) |
| Tax Bill | $10,274 (2025) |
| Deeds & Mortgages | Apr 2021 Sale & Mortgage Apr 2018 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 052-231-029-000 |
| Primary APN | 052-231-029-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 3 Rooms |
| Units | 2 Units |
| Stories | 1 Story |
| Building Area | 782 sqft Living Area |
| 1st Floor Area | 782 sqft |
| Year Built | Built 1946 |
|---|---|
| Effective Year Built | Effective 1988 |
| Architectural Style | Custom Design |
| Construction Type | Wood |
| Lot Area | 13,780 sqft (0.316 acres) |
| Heating System | Floor/Wall Furnace |
|---|
| Old Parcel Number | 052-231-029 |
|---|---|
| Street Address | 18423 RIVERSIDE DR |
| City | SONOMA |
| State | CA |
| Zip | 95476-4200 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | R15UA |
| Legal Description | 90 FM 52-231-13 PT 30 OR 90004110 |
| Legal Subdivision | CREEK FRONT ADD |
| Legal Block | 2 |
| Legal Lot Number | 39 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | SONOMA |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 150304 |
18423 Riverside Dr, a duplex, is owned and occupied by two individuals who bought it in April 2021.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 18423 RIVERSIDE DR, SONOMA, CA 95476-4200 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Apr 8, 2021 | Grant Deed, Transfer · FHA Mortgage CROSSCOUNTRY MORTGAGE LLC |
| Apr 23, 2018 | Quit Claim Deed, Transfer Quitclaim |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Apr 8, 2021 · Amount on File |
| Deed Sale | Apr 8, 2021 · Amount on File |
| Prior Sale | Feb 27, 2004 · Amount on File |
| Deed Document Number | 202143505 |
| Prior Transfer Date | Apr 20, 2018 |
| Prior Transfer Doc | 0000027482 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Apr 8, 2021 |
| Property Address | 18423 RIVERSIDE DR, SONOMA, CA 95476-4200 |
| Document Number | 0000043505 |
| Map Reference | MB 30 PG 28 |
| Instrument Date | Apr 5, 2021 |
| Instrument | 2021043505 |
| Transaction Type | Transfer |
| Record Updated | Aug 19, 2021 |
| Title Company | FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $735.90 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants with Right of Survivorship |
| Address | 692 HAYES ST, SAN FRANCISCO, CA 94102-4130 |
| Document Number | 0000043506 |
|---|---|
| Date | Apr 8, 2021 |
| Instrument | 2021043506 |
| Name | CROSSCOUNTRY MORTGAGE LLC |
|---|---|
| Type | Mortgage Company |
| Type | FHA Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | May 1, 2051 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Apr 23, 2018 |
| Property Address | 18423 RIVERSIDE DR, SONOMA, CA 95476-4200 |
| Document Number | 0000027482 |
| Instrument Date | Apr 20, 2018 |
| Instrument | 27482 |
| Transaction Type | Transfer |
| Record Updated | May 7, 2018 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
The 2025 property tax bill for 18423 Riverside Dr was $10,274 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 | $738,626 (+2%) Land $386,427 Building $352,199 | |
| 2025 | $10,274.00 Homeowner's exemption | $724,144 Land $378,850 Building $345,294 |
| 2023 | $9,820.00 (+2.6%) Homeowner's exemption | $696,027 Land $364,140 Building $331,887 |
| 2022 | $9,571.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 18423 Riverside Dr in Zone X, an area of minimal flood risk, within 100 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 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.
Wildfire risk around 18423 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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