521 Williams Dr, Petaluma, CA 94954 Property Records

Sonoma County property record for 521 Williams Dr, Petaluma, CA 94954

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,425 sqft · built 1955
Lot Size	0.139 acres (6,060 sqft)
Owner	Trust Name on File
Last Sale	$205,000 (Jan 2013)
Tax Bill	$2,931 (2025)
Deeds & Mortgages	Sep 2020 Mortgage Sep 2020 Transfer
Flood Zone	Zone X (minimal risk)
APN	`007-294-006-000`

Property Details

APN / Parcel Number

Primary APN	`007-294-006-000`
Alternative APN	`007-294-006`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	3 Rooms
Stories	1 Story
Building Area	1,425 sqft Living Area
1st Floor Area	1,425 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1955
Effective Year Built	Effective 1955
Exterior Material	Stucco
Construction Type	Wood
Roof Material	Composition Shingle
Lot Area	6,060 sqft (0.139 acres)
Garage Area	420 sqft
Porch	Porch

Utilities, Heating & Cooling

Cooling System	HVAC
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Old Parcel Number	007-294-006
Street Address	521 WILLIAMS DR
City	PETALUMA
State	CA
Zip	94954-3445
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	CITYPE
Legal Description	KENWORTH MANOR SUB LOT 61
Legal Subdivision	KENWORTH MANOR SUB
Legal Block	3
Legal Lot Number	61
Jurisdiction	SONOMA CA
Township / Civil Division	PETALUMA
Census Block Group	3
Census Block	3010
Census Tract	150603

Owner

521 Williams Dr is held in a trust since January 2013.

Source: Sonoma County records, as of September 1, 2026

Owner of Record	Trust Name on File
Mailing Address	8965 VALLEY FORD RD, PETALUMA, CA 94952-3717
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.

Deeds, Mortgages & Sale History

Date	Document
Sep 25, 2020	Deed of Trust, Mortgage · Conventional Mortgage REDWOOD CU
Sep 28, 2020	Quit Claim Deed, Transfer FIRST AMERICAN TITLE

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jan 25, 2013 · Amount on File
Deed Sale	Jan 25, 2013 · Amount on File
Prior Sale	Mar 9, 1995 · Amount on File
Deed Document Number	20138294
Prior Transfer Date	Jun 21, 2000
Prior Transfer Doc	0000064891
Record Updated	Oct 29, 2026

September 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SONOMA CA
Property Address	521 WILLIAMS DR, PETALUMA, CA 94954-3445
Transaction Type	Mortgage
Record Updated	Jul 25, 2022
Title Company	FIRST AMER TTL SANTA ROSA

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	8965 VALLEY FORD RD, PETALUMA, CA 94952-3717

Mortgage

Document Number	0000086554
Date	Sep 25, 2020
Instrument	2020086554

Lender

Name	REDWOOD CU
Type	Credit Union
Address	SANTA ROSA, CA 95403

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Oct 1, 2050

Interest

Rate Type	Adjustable Rate
Rate	3.5%
Type Change Date	Oct 1, 2030
Change Frequency	Annually
Min Rate At Change	2%
Max Rate At Change	8.5%
Index	1-Year LIBOR
Margin	2
Max Rate	8.5%

September 2020: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SONOMA CA
Recording Date	Sep 28, 2020
Property Address	521 WILLIAMS DR, PETALUMA, CA 94954-3445
Document Number	0000087264
Instrument Date	Sep 21, 2020
Instrument	87264
Transaction Type	Transfer
Record Updated	Oct 19, 2020
Title Company	FIRST AMERICAN TITLE

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	8965 VALLEY FORD RD PETALUMA CA 949523717, PETALUMA, CA 94952-3717

Tax Assessment & Valuation

The 2025 property tax bill for 521 Williams Dr was $2,931.

Source: Sonoma County assessment roll, as of September 1, 2026

Property Jurisdictions

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)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$257,479 (+2%) Land $100,479 Building $157,000
2025	$2,931.00	$252,431 Land $98,509 Building $153,922
2023	$2,758.00 (+0.47%)	$242,631 Land $94,685 Building $147,946
2022	$2,745.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

FEMA maps place 521 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.

Wildfire

The area around 521 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.

Drinking Water

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

Violations Reported to EPA

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.

Internet Providers

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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