Sonoma County property record for 21 Mountain Ave, Sonoma, CA 95476
| Property Type | Destroyed / Uninhabitable Vacant Land |
|---|---|
| Lot Size | 0.074 acres (3,200 sqft) |
| Owner | Trust Name on File |
| Last Sale | $180,000 (May 1997) |
| Tax Bill | $930 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 056-252-024-000 |
| Primary APN | 056-252-024-000 |
|---|---|
| Alternative APN |
|
| Lot Area | 3,200 sqft (0.074 acres) |
|---|
| Old Parcel Number | 056-252-024 |
|---|---|
| Street Address | 21 MOUNTAIN AVE |
| City | SONOMA |
| State | CA |
| Zip | 95476-3436 |
| Property Category | Vacant Land |
| Property Type | Vacant Land > Destroyed / Uninhabitable |
| Local Zoning Code | R13UA |
| Legal Subdivision | SUBDIVISION 1 OF AGUA CALIENTE PARK |
| Legal Block | 2 |
| Legal Lot Number | 60 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | SONOMA |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 150306 |
21 Mountain Ave, destroyed / uninhabitable vacant land, is held in a trust since June 2008.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | PO BOX 2108, SONOMA, CA 95476-2108 |
| 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 | May 23, 1997 · Amount on File |
| Deed Sale | May 23, 1997 · Amount on File |
| Deed Document Number | 199743695 |
| Last Transfer Date | Jun 17, 2008 |
| Transfer Doc | 0000078975 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 21 Mountain Ave was $930.
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 | $48,844 (+2%) Land $48,844 | |
| 2025 | $930.00 | $47,887 Land $47,887 |
| 2023 | $899.00 (+2.16%) | $46,029 Land $46,029 |
| 2022 | $880.00 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
FEMA maps place 21 Mountain Ave in Zone X, an area of minimal flood risk.
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 |
|---|---|
| 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 21 Mountain Ave is low, with a 0.04% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 65% of the US · lower than 79% of California |
|---|---|
| Wildfire Likelihood | 0.04% annual chance |
| Exposure | Indirect within 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 444 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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