Sonoma County property record for 21816 Russian River Ave, Monte Rio, CA 95462
| Property Type | Single Family Home |
|---|---|
| Details | 1 bd · 1 ba · 636 sqft · built 1961 |
| Lot Size | 0.469 acres (20,415 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $456,500 (Sep 2005) |
| Tax Bill | $7,557 (2025) |
| Flood Zone | Zone AE (high risk) |
| APN | 095-051-045-000 |
| Primary APN | 095-051-045-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 1 Bed |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 1 Room |
| Stories | 1 Story |
| Building Area | 636 sqft Living Area |
| 1st Floor Area | 636 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1961 |
|---|---|
| Effective Year Built | Effective 1961 |
| Architectural Style | L-Shape |
| Construction Type | Frame |
| Lot Area | 20,415 sqft (0.469 acres) |
| Old Parcel Number | 095-051-045 |
|---|---|
| Street Address | 21816 RUSSIAN RIVER AVE |
| City | MONTE RIO |
| State | CA |
| Zip | 95462 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | RR1 |
| Legal Description | 2007 FM 095-051-036 & 040 CMB PER VM06-0017 |
| Legal Subdivision | RUSSIAN RIVER |
| Legal Block | 4 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | RUSSIAN RIVER-SONOMA COAST |
| Census Block Group | 4 |
| Census Block | 4000 |
| Census Tract | 153708 |
21816 Russian River Ave is owned by two individuals who bought it in September 2005.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 20 RHEEM BLVD, ORINDA, CA 94563-3619 |
| 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.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Sep 23, 2005 · Amount on File |
| Deed Sale | Sep 23, 2005 · Amount on File |
| Deed Document Number | 2005142177 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 21816 Russian River Ave was $7,557.
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Secondary School District | West Sonoma County Union High School District (09 - 12) |
| Elementary School District | Monte Rio Union Elementary School District (KG - 08) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $635,612 (+2%) Land $327,563 Building $308,049 | |
| 2025 | $7,557.00 | $623,150 Land $321,141 Building $302,009 |
| 2023 | $7,259.00 (+2.02%) | $598,955 Land $308,672 Building $290,283 |
| 2022 | $7,115.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 21816 Russian River Ave in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective February 15, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 26 policies |
| Community Rating System | Class 10 (0% premium discount) |
| Nearby Flood Policies | 26 in force |
| Nearby Flood Claims | 7 (2005–2025) |
| Most Recent Claim | Feb 2025 · river or lake flooding |
| 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.
Wildfire risk around 21816 Russian River Ave is moderate, ranking above 42% of the US, with a 0.06% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 42% of the US · lower than 75% of California |
|---|---|
| Wildfire Likelihood | 0.06% annual chance |
| Exposure | Direct burnable vegetation |
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 | SWEETWATER SPRINGS CWD - MONTE RIO serves 3,531 people · EPA ID CA4910028 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Oct 2021 |
| Lead | Under 1 ppb (2023–2025) 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. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 49 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 1,200 / 35 |
5G (outdoors only) and 4G LTE
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