20431 Blue Mountain Dr, Walnut, CA 91789 Property Records

Los Angeles County property record for 20431 Blue Mountain Dr, Walnut, CA 91789

Property Summary

Property Type	Single Family Home
Details	4 bd · 2 ba · 1,999 sqft · built 1965
Lot Size	0.39 acres (16,970 sqft)
Owner	2 Individual Names on Record
Last Sale	$225,000 (Apr 1995)
Tax Bill	$5,377 (2025)
Deeds & Mortgages	Jul 2023 Transfer
Flood Zone	Zone D (undetermined)
APN	`8712-004-027`

Property Details

APN / Parcel Number

Primary APN	`8712-004-027`

Interior

Bedrooms	4 Beds
Full Baths	2 Baths
Total Rooms	9 Rooms
Stories	1 Story
Building Area	1,999 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1965
Effective Year Built	Effective 1965
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Wood Shingle
Lot Area	16,970 sqft (0.39 acres)
Lot Dimensions	165 ft deep x 104 ft wide

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	20431 BLUE MOUNTAIN DR
City	WALNUT
State	CA
Zip	91789-1001
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	WAR110000*
Legal Description	TRACT NO 27484 LOT 8
Legal Subdivision	27484
Legal Tract	27484
Legal Block	1
Legal Lot Number	8
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	1
Census Block	1005
Census Tract	403409

Owner

Source: Los Angeles County records, as of August 25, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Individual Names on Record
Mailing Address	20431 BLUE MOUNTAIN DR, WALNUT, CA 91789-1001
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Apr 25, 1995 · Amount on Record
Deed Sale	Apr 25, 1995 · Amount on Record
Deed Document Number	1995674743
Prior Transfer Date	Mar 6, 1995
Prior Transfer Doc	0000674744
Record Updated	Oct 29, 2026

July 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	LOS ANGELES CA
Recording Date	Jul 12, 2023
Property Address	20431 BLUE MOUNTAIN DR, WALNUT, CA 91789-1001
Document Number	0000455301
Map Reference	MB 718 PG 74-775
Instrument Date	Jun 22, 2023
Instrument	23-0455301
Transaction Type	Transfer
Record Updated	Jul 28, 2023

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	20431 BLUE MOUNTAIN DR, WALNUT, CA 91789-1001

Tax Assessment & Valuation

Source: Los Angeles County assessment roll, as of August 25, 2026

Property Jurisdictions

Type	Name
State	California
County	Los Angeles County
Municipality	Walnut City
Unified School District	Walnut Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$385,460 (+2%) Land $147,153 Building $238,307
2025	$5,377.00 (+7.15%)	$377,903 (+4.04%) Land $144,268 Building $233,635
2024	$5,018.00 (+3.4%)
2023	$4,853.00 (+3.17%) Homeowner's exemption	$363,230 (+2%) Land $138,667 Building $224,563
2022	$4,704.00 Homeowner's exemption	$356,109 Land $135,949 Building $220,160

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

Flood

Source: FEMA National Flood Hazard Layer, effective September 30, 2026

FEMA Flood Zone	Zone D undetermined · not studied
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

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

Wildfire Risk	Moderate above 53% of the US · lower than 68% of California
Wildfire Likelihood	0.07% annual chance
Exposure	Direct burnable vegetation

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	WALNUT VALLEY WATER DISTRICT serves 100,941 people · EPA ID CA1910234
Water Source	Purchased surface water from several systems
Last State Inspection	Jun 2023
Lead	Under 1 ppb (2022–2024) 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 96 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Frontier Fiber	7,000 / 7,000
Spectrum Cable	1,000 / 1,000

May also be available: Verizon.

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