310 W Sierra Ave, Cotati, CA 94931 Property Records

Sonoma County property record for 310 W Sierra Ave, Cotati, CA 94931

Property Summary

Property Type	Single Family Home
Details	2 bd · 1 ba · 576 sqft · built 1954
Lot Size	0.162 acres (7,070 sqft)
Owner	2 Individual Names on File
Last Sale	$450,000 (Feb 2021)
Tax Bill	$6,019 (2025)
Deeds & Mortgages	Feb 2021 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`144-391-004-000`

Property Details

APN / Parcel Number

Primary APN	`144-391-004-000`
Alternative APN	`144-391-004`

Interior

Bedrooms	2 Beds
Full Baths	1 Bath
Total Rooms	2 Rooms
Stories	1 Story
Building Area	576 sqft Living Area
Gross Area	816 sqft
1st Floor Area	576 sqft

Exterior

Year Built	Built 1954
Effective Year Built	Effective 1959
Architectural Style	Custom Design
Construction Type	Wood
Lot Area	7,070 sqft (0.162 acres)
Garage Type	Attached
Garage Area	240 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	None

Location & Zoning

Old Parcel Number	144-391-004
Street Address	310 W SIERRA AVE
City	COTATI
State	CA
Zip	94931-4219
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	CITYCO
Legal Description	MAP 10 PG 10 PART OF LOT 108
Legal Subdivision	SUBDIVISION #3 COTATI RANCHO
Legal Block	1
Legal Lot Number	108
Jurisdiction	SONOMA CA
Township / Civil Division	PETALUMA
Census Block Group	1
Census Block	1003
Census Tract	151204

Owner

310 W Sierra Ave is owned and occupied by two individuals who bought it in February 2021.

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

Owner of Record	2 Individual Names on File
Mailing Address	310 W SIERRA AVE, COTATI, CA 94931-4219
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

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

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Feb 19, 2021 · Amount on File
Deed Sale	Feb 19, 2021 · Amount on File
Prior Sale	Jun 11, 2004 · Amount on File
Deed Document Number	202120446
Prior Transfer Date	Oct 6, 1994
Prior Transfer Doc	0000035481
Record Updated	Oct 29, 2026

February 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SONOMA CA
Recording Date	Feb 19, 2021
Property Address	310 W SIERRA AVE, COTATI, CA 94931-4219
Document Number	0000020446
Map Reference	MB 10 PG 10
Instrument Date	Feb 17, 2021
Instrument	2021020446
Transaction Type	Transfer
Record Updated	Aug 19, 2021
Title Company	FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$495.00
Amount Accuracy	Rounded by County
Additional	Notice of Default Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	310 W SIERRA AVE, COTATI, CA 94931-4219

Mortgage

Document Number	0000020447
Date	Feb 19, 2021
Instrument	2021020447

Lender

Name	CMG MORTGAGE INC
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Mar 1, 2051

Tax Assessment & Valuation

The 2025 property tax bill for 310 W Sierra Ave was $6,019.

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

Property Jurisdictions

Type	Name
State	California
County	Sonoma County
Municipality	Cotati City
Unified School District	Cotati-Rohnert Park Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$496,834 (+2%) Land $198,733 Building $298,101
2025	$6,019.00	$487,093 Land $194,837 Building $292,256
2023	$5,844.00 (+1.78%)	$468,180 Land $187,272 Building $280,908
2022	$5,742.00

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

Flood

FEMA maps place 310 W Sierra Ave in Zone X, an area of minimal flood risk, within 100 ft of a high-risk flood zone.

Source: FEMA National Flood Hazard Layer, effective February 15, 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 100 ft
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	2 in force
Nearby Flood Claims	1 (1995)
Most Recent Claim	Jan 1995 · Severe Winter Storms, Flooding, Landslides, Mud Flows

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 310 W Sierra Ave is low, with a 0.02% annual chance of wildfire.

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

Wildfire Risk	Low lower than 97% of the US · lower than 97.8% of California
Wildfire Likelihood	0.02% annual chance
Exposure	None beyond 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 COTATI serves 7,290 people · EPA ID CA4910016
Water Source	Groundwater
Last State Inspection	Aug 2024
Lead	Under 1 ppb (2024–2026) 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 321 locations within half a mile, as of December 31, 2025

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