307 Semillon Cir, Clayton, CA 94517 Property Records

Contra Costa County property record for 307 Semillon Cir, Clayton, CA 94517

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 2,391 sqft · built 1978
Lot Size	0.297 acres (12,915 sqft)
Owner	2 Trust Names on File
Last Sale	$501,000 (Mar 2001)
Tax Bill	$9,740 (2025)
Deeds & Mortgages	Jun 2026 Transfer Jul 2018 Line of Credit
Flood Zone	Zone X (minimal risk)
APN	`119-554-004`

Property Details

APN / Parcel Number

Primary APN	`119-554-004`
Alternative APN	`119-554-004-0`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	11 Rooms
Stories	2 Stories
Building Area	2,391 sqft Living Area
Gross Area	2,882 sqft
1st Floor Area	1,423 sqft
2nd Floor Area	968 sqft

Exterior

Year Built	Built 1978
Effective Year Built	Effective 1979
Lot Area	12,915 sqft (0.297 acres)
Garage Type	Attached
Garage Area	491 sqft
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	307 SEMILLON CIR
City	CLAYTON
State	CA
Zip	94517-1419
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R12
Legal Description	T04805 L0020 B
Legal Subdivision	SUBDIVISION 4805
Legal Tract	04805
Legal Lot Number	20
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	1
Census Block	1011
Census Tract	355308

Owner

307 Semillon Cir is owner-occupied and held in a trust since August 2010.

Source: Contra Costa County records, as of July 14, 2026

Owner of Record	2 Trust Names on File
Mailing Address	307 SEMILLON CIR, CLAYTON, CA 94517-1419
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Revocable 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
Jun 18, 2026	Quit Claim Deed, Transfer NONE LISTED ON DOCUMENT
Jul 3, 2018	Deed of Trust, Mortgage · Line of Credit PATELCO CU

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 7, 2001 · Amount on File
Deed Sale	Mar 7, 2001 · Amount on File
Deed Document Number	200153090
Last Transfer Date	Aug 23, 2010
Transfer Doc	0000184139
Record Updated	Oct 29, 2026

June 2026: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Jun 18, 2026
Property Address	307 SEMILLON CIR, CLAYTON, CA 94517-1419
Document Number	0000064552
Instrument Date	Jun 17, 2026
Instrument	202664552
Transaction Type	Transfer
Record Updated	Aug 30, 2026
Title Company	NONE LISTED ON DOCUMENT

Transaction

Tax	$0.00
Amount Accuracy	Full Amount Stated
Additional	Quitclaim

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	307 SEMILLON CIR, CLAYTON, CA 94517-1419

July 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	307 SEMILLON CIR, CLAYTON, CA 94517-1419
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	ACCOMMODATION

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000106004
Date	Jul 3, 2018
Instrument	2018-106004

Lender

Name	PATELCO CU
Type	Credit Union
Address	PLEASANTON, CA 94588

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	300 Months
Due	Jul 30, 2043

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

Tax Assessment & Valuation

The 2025 property tax bill for 307 Semillon Cir was $9,740.

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Municipality	Clayton City
Unified School District	Mount Diablo Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$782,516 (+2%) Land $371,936 Building $410,580
2025	$9,740.00 Homeowner's exemption	$767,174 Land $364,644 Building $402,530
2023	$9,322.00 (+1.34%) Homeowner's exemption	$737,386 Land $350,486 Building $386,900
2022	$9,199.00

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

Flood

FEMA maps place 307 Semillon Cir in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.

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
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	4 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

Wildfire risk around 307 Semillon Cir is moderate, ranking above 47% of the US, with a 0.09% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Moderate above 47% of the US · lower than 72% of California
Wildfire Likelihood	0.09% annual chance
Exposure	Indirect 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	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

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 253 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20

May also be available: AT&T.

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