Contra Costa County property record for 3970 Joan Ave, Concord, CA 94521
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.5 ba · 1,564 sqft · built 1940 |
| Lot Size | 0.48 acres (20,908 sqft) |
| Owner | Trust Name on File |
| Last Sale | $430,000 (Feb 2016) |
| Tax Bill | $6,511 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 132-080-039-2 |
| Primary APN | 132-080-039-2 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,564 sqft Living Area |
| 1st Floor Area | 1,564 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1940 |
|---|---|
| Effective Year Built | Effective 1940 |
| Architectural Style | Bungalow |
| Exterior Material | Other |
| Construction Type | Frame |
| Roof Material | Composition Shingle |
| Lot Area | 20,908 sqft (0.48 acres) |
| Garage Type | Detached |
| Garage Area | 640 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Floor/Wall Furnace |
|---|---|
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 3970 JOAN AVE |
|---|---|
| City | CONCORD |
| State | CA |
| Zip | 94521-2545 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R8 |
| Legal Description | GREENFIELD TR POR LOT 27 |
| Legal Subdivision | GREENFIELD |
| Legal Lot Number | 27 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2007 |
| Census Tract | 334001 |
3970 Joan Ave is owner-occupied and held in a trust since February 2016.
Source: Contra Costa County records, as of October 9, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | PO BOX 18577, OAKLAND, CA 94619-0577 |
| 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 | Feb 9, 2016 · Amount on File |
| Deed Sale | Feb 9, 2016 · Amount on File |
| Prior Sale | Feb 9, 2016 · Amount on File |
| Deed Document Number | 201622082 |
| Prior Transfer Date | Jan 22, 2016 |
| Prior Transfer Doc | 0000022081 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 3970 Joan Ave was $6,511 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 | Concord City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $519,203 (+2%) Land $422,611 Building $96,592 | |
| 2025 | $6,511.00 Homeowner's exemption | $509,024 Land $414,325 Building $94,699 |
| 2023 | $6,212.00 (-0.86%) Homeowner's exemption | $489,260 Land $398,237 Building $91,023 |
| 2022 | $6,266.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 3970 Joan Ave in Zone X, an area of minimal flood risk, though there have been 3 flood claims nearby since 1980.
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 |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 9 in force |
| Nearby Flood Claims | 3 (1980–2005) |
| Most Recent Claim | Dec 2005 · Severe Storms, Flooding, Mudslides, And Landslides |
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.
The area around 3970 Joan Ave has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within 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 | CONTRA COSTA WATER DISTRICT serves 210,500 people · EPA ID CA0710003 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2022 |
| Lead | Under 1 ppb (2026–2028) 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 579 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable | 1,500 / 50 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless · DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Sonic Telecom.
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