Contra Costa County property record for 309 Mare Ln, San Ramon, CA 94583
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 3 ba · 2,776 sqft · built 1982 |
| Lot Size | 0.222 acres (9,682 sqft) |
| Owner | Trust Name on File |
| Tax Bill | $6,326 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 209-633-015 |
| Primary APN | 209-633-015 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 10 Rooms |
| Stories | 2 Stories |
| Building Area | 2,776 sqft Living Area |
| Gross Area | 3,382 sqft |
| 1st Floor Area | 1,456 sqft |
| 2nd Floor Area | 1,320 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1982 |
|---|---|
| Effective Year Built | Effective 1983 |
| Architectural Style | Cluster |
| Exterior Material | Stucco |
| Roof Material | Wood Shingle |
| Lot Area | 9,682 sqft (0.222 acres) |
| Garage Type | Attached |
| Garage Area | 606 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Forced Air with A/C |
|---|---|
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 309 MARE LN |
|---|---|
| City | SAN RAMON |
| State | CA |
| Zip | 94583-2418 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T05324 L0155 B |
| Legal Tract | 05324 |
| Legal Lot Number | 155 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2002 |
| Census Tract | 345115 |
309 Mare Ln is owner-occupied and held in a trust since June 2001.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 309 MARE LN, SAN RAMON, CA 94583-2418 |
| 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 Transfer Date | Jun 16, 2001 |
| Transfer Doc | 0000191560 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 309 Mare Ln was $6,326 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 | $502,114 (+2%) Land $142,246 Building $359,868 | |
| 2025 | $6,326.00 Homeowner's exemption | $492,269 Land $139,457 Building $352,812 |
| 2023 | $6,079.00 (+0.78%) Homeowner's exemption | $473,156 Land $134,043 Building $339,113 |
| 2022 | $6,032.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 309 Mare Ln in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2022.
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 6 (20% premium discount) |
| Nearby Flood Policies | 1 in force |
| Nearby Flood Claims | 1 (2022) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides |
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 309 Mare Ln is moderate, ranking above 65% of the US, with a 0.2% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 65% of the US · above 40% of California |
|---|---|
| Wildfire Likelihood | 0.2% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 549 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 |
May also be available: T-Mobile.
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