Contra Costa County property record for 4089 Dunbarton Cir, San Ramon, CA 94583
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 3,367 sqft · built 1986 |
| Lot Size | 0.23 acres (10,000 sqft) |
| Owner | Trust Name on File |
| Last Sale | $440,000 (Mar 1995) |
| Tax Bill | $8,997 (2025) |
| Deeds & Mortgages | Mar 2020 Line of Credit |
| Flood Zone | Zone X (minimal risk) |
| APN | 213-113-025 |
| Primary APN | 213-113-025 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 12 Rooms |
| Stories | 2 Stories |
| Building Area | 3,367 sqft Living Area |
| 1st Floor Area | 1,605 sqft |
| 2nd Floor Area | 1,762 sqft |
| Year Built | Built 1986 |
|---|---|
| Effective Year Built | Effective 2005 |
| Lot Area | 10,000 sqft (0.23 acres) |
| Garage Type | Attached |
| Garage Area | 671 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 4089 DUNBARTON CIR |
|---|---|
| City | SAN RAMON |
| State | CA |
| Zip | 94583-2567 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T05520 L0048 B |
| Legal Subdivision | SUBDIVISION 5520 |
| Legal Tract | 05520 |
| Legal Lot Number | 48 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 345111 |
4089 Dunbarton Cir is owner-occupied and held in a trust since December 1998.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 4089 DUNBARTON CIR, SAN RAMON, CA 94583-2567 |
| Occupancy | Owner Occupied |
| 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 | Mar 7, 1995 · Amount on File |
| Deed Sale | Mar 7, 1995 · Amount on File |
| Deed Document Number | 199537132 |
| Last Transfer Date | Dec 18, 1998 |
| Transfer Doc | 0000000753 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 4089 DUNBARTON CIR, SAN RAMON, CA 94583-2567 |
| Transaction Type | Mortgage |
| Record Updated | Nov 3, 2022 |
| Title Company | FIDELITY NATIONAL TITLE |
| Name | Verified Name |
|---|
| Document Number | 0000047259 |
|---|---|
| Date | Mar 12, 2020 |
| Instrument | 2020-047259 |
| Name | FREMONT BANK |
|---|---|
| Type | Bank |
| Address | LIVERMORE, CA 94551 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Mar 9, 2050 |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
The 2025 property tax bill for 4089 Dunbarton Cir was $8,997 with a homeowner's exemption.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | San Ramon City |
| Unified School District | San Ramon Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $753,825 (+2%) Land $222,714 Building $531,111 | |
| 2025 | $8,997.00 Homeowner's exemption | $739,046 Land $218,348 Building $520,698 |
| 2023 | $8,660.00 (+0.78%) Homeowner's exemption | $710,350 Land $209,870 Building $500,480 |
| 2022 | $8,593.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 4089 Dunbarton Cir in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 4089 Dunbarton Cir is low, with a 0.01% 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 | 0.01% 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 | EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| Lead | Under 1 ppb (2022–2024) 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 167 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 2,000 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| AT&T DSL | 100 / 20 |
May also be available: T-Mobile.
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