Sonoma County property record for 520 Williams Dr, Petaluma, CA 94954
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3 ba · 1,997 sqft · built 1955 |
| Lot Size | 0.13 acres (5,670 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $150,000 (Nov 1992) |
| Tax Bill | $4,345 (2025) |
| Deeds & Mortgages | Oct 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 007-293-012-000 |
| Primary APN | 007-293-012-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 5 Rooms |
| Stories | 2 Stories |
| Building Area | 1,997 sqft Living Area |
| Gross Area | 2,420 sqft |
| 1st Floor Area | 1,045 sqft |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 1970 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 5,670 sqft (0.13 acres) |
| Garage Type | Attached |
| Garage Area | 423 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | HVAC |
|---|
| Old Parcel Number | 007-293-012 |
|---|---|
| Street Address | 520 WILLIAMS DR |
| City | PETALUMA |
| State | CA |
| Zip | 94954-3446 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | CITYPE |
| Legal Description | KENWORTH MANOR SUB LOT 52 |
| Legal Subdivision | KENWORTH MANOR SUB |
| Legal Block | 3 |
| Legal Lot Number | 52 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | PETALUMA |
| Census Block Group | 3 |
| Census Block | 3011 |
| Census Tract | 150603 |
520 Williams Dr is owner-occupied and held in a trust since October 2020.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 520 WILLIAMS DR, PETALUMA, CA 94954-3446 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family 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 Sale | Nov 20, 1992 · Amount on File |
| Deed Sale | Nov 20, 1992 · Amount on File |
| Deed Document Number | 1992145381 |
| Last Transfer Date | Oct 7, 2020 |
| Transfer Doc | 0000094601 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Oct 16, 2020 |
| Property Address | 520 WILLIAMS DR, PETALUMA, CA 94954-3446 |
| Document Number | 0000094601 |
| Map Reference | MB 73 PG 36&37 |
| Instrument Date | Oct 7, 2020 |
| Instrument | 2020094601 |
| Transaction Type | Transfer |
| Record Updated | Aug 19, 2021 |
| Title Company | NORTH AMERICAN TITLE CO INC |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 520 WILLIAMS DR, PETALUMA, CA 94954-3446 |
| Document Number | 0000094602 |
|---|---|
| Date | Oct 16, 2020 |
| Instrument | 2020094602 |
| Name | PLATINUM HOME MORTGAGE CORP |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Nov 1, 2050 |
The 2025 property tax bill for 520 Williams Dr was $4,345.
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Municipality | Petaluma City |
| Elementary School District | Old Adobe Union Elementary School District (KG - 06) |
| Secondary School District | Petaluma Joint Union High School District (07 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $384,863 (+2%) Land $132,811 Building $252,052 | |
| 2025 | $4,345.00 | $377,317 Land $130,207 Building $247,110 |
| 2023 | $4,086.00 (+0.49%) | $362,666 Land $125,151 Building $237,515 |
| 2022 | $4,066.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 520 Williams Dr in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective February 15, 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.
The area around 520 Williams Dr 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 | CITY OF PETALUMA serves 61,427 people · EPA ID CA4910006 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Jun 2024 |
| Lead | Under 1 ppb (2021–2023) 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 788 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| Xfinity Cable | 2,000 / 250 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Verizon.
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