Sonoma County property record for 1100 W Sierra Ave, Cotati, CA 94931
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,394 sqft · built 1952 |
| Lot Size | 4.25 acres (185,565 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $700,000 (Jan 2016) |
| Tax Bill | $9,920 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 046-101-005-000 |
| Primary APN | 046-101-005-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,394 sqft Living Area |
| 1st Floor Area | 1,394 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1952 |
|---|---|
| Effective Year Built | Effective 1961 |
| Construction Type | Wood |
| Lot Area | 185,565 sqft |
| Garage Type | Detached |
| Garage Area | 748 sqft |
| Parking Spaces | 3 Parking Spaces |
| Porch | Porch |
| Cooling System | Central |
|---|
| Old Parcel Number | 046-101-005 |
|---|---|
| Street Address | 1100 W SIERRA AVE |
| City | COTATI |
| State | CA |
| Zip | 94931-9734 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | RR25 |
| Legal Description | MAP 10 PG 3 PART OF LOT 90 |
| Legal Subdivision | SUBDIVISION #4 RANCHO COTATI |
| Legal Block | 2 |
| Legal Lot Number | 90 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | PETALUMA |
| Census Block Group | 2 |
| Census Block | 2013 |
| Census Tract | 151206 |
1100 W Sierra Ave is owned and occupied by two individuals who bought it in January 2016.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 1100 W SIERRA AVE, COTATI, CA 94931-9734 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
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 | Jan 13, 2016 · Amount on File |
| Deed Sale | Jan 13, 2016 · Amount on File |
| Prior Sale | Aug 12, 2013 · Amount on File |
| Deed Document Number | 20162707 |
| Prior Transfer Date | Mar 2, 2011 |
| Prior Transfer Doc | 0000037337 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 1100 W Sierra Ave was $9,920.
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Unified School District | Cotati-Rohnert Park Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $845,224 (+2%) Land $362,238 Building $482,986 | |
| 2025 | $9,920.00 | $828,652 Land $355,136 Building $473,516 |
| 2023 | $9,637.00 (+1.76%) | $796,477 Land $341,347 Building $455,130 |
| 2022 | $9,470.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 1100 W Sierra 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 |
| Nearby Flood Policies | 1 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 1100 W Sierra Ave is moderate, ranking above 44% of the US, with a 0.1% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 44% of the US · lower than 74% of California |
|---|---|
| Wildfire Likelihood | 0.1% 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 | CITY OF COTATI serves 7,290 people · EPA ID CA4910016 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Aug 2024 |
| 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 45 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 |
Search by:
By searching, you agree to: Terms • Privacy • Disclosures