Contra Costa County property record for 3530 Carlfield St, El Sobrante, CA 94803
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 2 ba · 1,530 sqft · built 1948 |
| Lot Size | 0.119 acres (5,200 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $105,000 (May 1994) |
| Tax Bill | $4,450 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 420-034-006-7 |
| Primary APN | 420-034-006-7 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,530 sqft Living Area |
| 1st Floor Area | 1,530 sqft |
| Year Built | Built 1948 |
|---|---|
| Effective Year Built | Effective 1975 |
| Lot Area | 5,200 sqft (0.119 acres) |
| Garage Type | Attached |
| Garage Area | 305 sqft |
| Parking Spaces | 1 Parking Space |
| Street Address | 3530 CARLFIELD ST |
|---|---|
| City | EL SOBRANTE |
| State | CA |
| Zip | 94803-2704 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R6 |
| Legal Description | SERPA TRACT 6 1 |
| Legal Subdivision | SERPA |
| Legal Tract | 6 |
| Legal Block | 1 |
| Legal Lot Number | 6 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | WEST CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 369002 |
3530 Carlfield St is owned and occupied by two individuals who bought it in May 1994.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 3530 CARLFIELD ST, EL SOBRANTE, CA 94803-2704 |
| Occupancy | Owner Occupied |
| 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 | May 16, 1994 · Amount on File |
| Deed Sale | May 16, 1994 · Amount on File |
| Deed Document Number | 1994133352 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 3530 Carlfield St was $4,450 with a homeowner's exemption.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Unified School District | West Contra Costa Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $272,141 (+2%) Land $131,137 Building $141,004 | |
| 2025 | $4,450.00 Homeowner's exemption | $266,806 Land $128,566 Building $138,240 |
| 2023 | $4,360.00 (+1.7%) Homeowner's exemption | $256,448 Land $123,575 Building $132,873 |
| 2022 | $4,287.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 3530 Carlfield St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone A, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Claims | 1 (1983) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Jul 1983 · tidal / storm surge |
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 3530 Carlfield St 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 330 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: Etheric Networks, T-Mobile.
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