San Joaquin County property record for 31665 S Koster Rd, Tracy, CA 95304
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,802 sqft · built 1982 |
| Lot Size | 1.8 acres (78,408 sqft) |
| Owner | Trust Name on File |
| Tax Bill | $4,838 (2026) |
| Deeds & Mortgages | Jan 2020 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 255-100-170-000 |
| Primary APN | 255-100-170-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Stories | 1 Story |
| Building Area | 2,802 sqft Living Area |
| 1st Floor Area | 2,802 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1982 |
|---|---|
| Effective Year Built | Effective 1982 |
| Architectural Style | Custom Design |
| Construction Type | Wood |
| Lot Area | 78,408 sqft (1.8 acres) |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Old Parcel Number | 255-100-17 |
|---|---|
| Street Address | 31665 S KOSTER RD |
| City | TRACY |
| State | CA |
| Zip | 95304-9551 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | RR |
| Legal Description | 81-FM 255-100-05 PT TO 15 16& RD 80082225 PM 9-174 |
| Legal Block | 1 |
| Legal Lot Number | C |
| Jurisdiction | SAN JOAQUIN CA |
| Township / Civil Division | TRACY |
| Census Block Group | 1 |
| Census Block | 1021 |
| Census Tract | 5503 |
31665 S Koster Rd is owner-occupied and held in a trust since January 2020.
Source: San Joaquin County records, as of October 13, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 31665 S KOSTER RD, TRACY, CA 95304-9551 |
| 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 | Jan 10, 2020 |
| Transfer Doc | 0000011125 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | SAN JOAQUIN CA |
| Recording Date | Jan 27, 2020 |
| Property Address | 31665 S KOSTER RD, TRACY, CA 95304-9551 |
| Document Number | 0000011125 |
| Instrument Date | Jan 10, 2020 |
| Instrument | 11125 |
| Transaction Type | Transfer |
| Record Updated | Feb 11, 2020 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
| Address | 31665 S KOSTER RD TRACY CA 953049551, TRACY, CA 95304-9551 |
The 2026 property tax bill for 31665 S Koster Rd was $4,838 with a homeowner's exemption, up 1.5% from the year before.
Source: San Joaquin County assessment roll, as of September 24, 2025
| Type | Name |
|---|---|
| State | California |
| County | San Joaquin County |
| Secondary School District | Tracy Unified School District (9-12) (09 - 12) |
| Elementary School District | New Jerusalem Elementary School District (KG - 08) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $4,838.00 (+1.49%) | ||
| 2025 | $4,767.00 Homeowner's exemption | $450,217 Land $150,070 Building $300,147 | |
| 2023 | $4,543.00 (+1.79%) Homeowner's exemption | $432,737 Land $144,244 Building $288,493 | $1,122,390 |
| 2022 | $4,463.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 31665 S Koster Rd in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 27, 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 | 3 in force |
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 31665 S Koster Rd is low, with a 0.05% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 64% of the US · lower than 78% of California |
|---|---|
| Wildfire Likelihood | 0.05% 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: FCC Broadband Data Collection, based on 14 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| ezWave Fixed Wireless | 1,000 / 200 |
| Matrix Broadband Fixed Wireless | 400 / 80 |
| unWired Broadband Fixed Wireless | 400 / 50 |
| Verizon Fixed Wireless | 300 / 20 |
| Cal.net Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 25 / 3 |
| T-Mobile Fixed Wireless | 25 / 3 |
May also be available: Xfinity.
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