Contra Costa County property record for 4048 Dunbarton Cir, San Ramon, CA 94583
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,727 sqft · built 1985 |
| Lot Size | 0.331 acres (14,400 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $7,985 (2025) |
| Deeds & Mortgages | Jan 2022 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 213-112-009-5 |
| Primary APN | 213-112-009-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,727 sqft Living Area |
| 1st Floor Area | 1,492 sqft |
| 2nd Floor Area | 1,235 sqft |
| Year Built | Built 1985 |
|---|---|
| Effective Year Built | Effective 1986 |
| Lot Area | 14,400 sqft (0.331 acres) |
| Garage Type | Attached |
| Garage Area | 672 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 4048 DUNBARTON CIR |
|---|---|
| City | SAN RAMON |
| State | CA |
| Zip | 94583-2565 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T05520 L0015 B |
| Legal Subdivision | SUBDIVISION 5520 |
| Legal Tract | 05520 |
| Legal Lot Number | 15 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 345111 |
4048 Dunbarton Cir is owner-occupied and held in a trust since July 2007.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 4048 DUNBARTON CIR, SAN RAMON, CA 94583-2565 |
| 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 | 2 Names on Deed |
|---|---|
| Last Transfer Date | Jul 18, 2007 |
| Transfer Doc | 0000214746 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 4048 DUNBARTON CIR, SAN RAMON, CA 94583-2565 |
| Transaction Type | Mortgage |
| Record Updated | Jun 8, 2026 |
| Title Company | FIDELITY NATIONAL TITLE, FIDELITY NATL TTL ORANGE CNT |
| Name | Verified Name |
|---|---|
| Address | 4048 DUNBARTON CIR, SAN RAMON, CA 94583-2565 |
| Document Number | 0000010877 |
|---|---|
| Date | Jan 19, 2022 |
| Instrument | 2022-010877 |
| Name | MUFG UNION BANK NA |
|---|---|
| Type | Bank |
| Address | SAN DIEGO, CA 92121 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 481 Months |
| Due | Feb 1, 2062 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 3.25% |
| Type Change Date | Feb 1, 2032 |
| Change Frequency | 6 Months |
| Min Rate At Change | 2.75% |
| Max Rate At Change | 5.25% |
| Index | Other |
| Max Rate | 9.25% |
The 2025 property tax bill for 4048 Dunbarton Cir was $7,985 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 | $658,425 (+2%) Land $172,253 Building $486,172 | |
| 2025 | $7,985.00 Homeowner's exemption | $645,516 Land $168,876 Building $476,640 |
| 2023 | $7,682.00 (+0.79%) Homeowner's exemption | $620,452 Land $162,319 Building $458,133 |
| 2022 | $7,622.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 4048 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 4048 Dunbarton Cir is low, with less than 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 96% of the US · lower than 97.4% of California |
|---|---|
| Wildfire Likelihood | Under 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 686 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 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| AT&T DSL · Fixed Wireless in parts of the area | 100 / 20 |
May also be available: T-Mobile, Verizon.
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