2420 Mammoth Way, Antioch, CA 94531 Property Records

Contra Costa County property record for 2420 Mammoth Way, Antioch, CA 94531

Property Summary

Property Type	Single Family Home
Details	5 bd · 3 ba · 2,813 sqft · built 2001
Lot Size	0.152 acres (6,611 sqft)
Owner	Individual Name on File
Last Sale	$430,000 (Sep 2016)
Tax Bill	$5,908 (2025)
Deeds & Mortgages	Nov 2025 Transfer
Flood Zone	Zone X (minimal risk)
APN	`055-590-072-9`

Property Details

APN / Parcel Number

Primary APN	`055-590-072-9`
Alternative APN	`055-590-072`

Interior

Bedrooms	5 Beds
Full Baths	3 Baths
Half Baths	1 Half Bath
Total Rooms	11 Rooms
Stories	2 Stories
Building Area	2,813 sqft Living Area
1st Floor Area	1,477 sqft
2nd Floor Area	1,336 sqft

Exterior

Year Built	Built 2001
Effective Year Built	Effective 2001
Lot Area	6,611 sqft (0.152 acres)
Garage Type	Attached
Garage Area	713 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central

Location & Zoning

Street Address	2420 MAMMOTH WAY
City	ANTIOCH
State	CA
Zip	94531-9085
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T8314 L686
Legal Subdivision	SUBDIVISION 8314
Legal Tract	8314
Legal Lot Number	686
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	TASSAJARA
Census Block Group	1
Census Block	1008
Census Tract	355119

Owner

Source: Contra Costa County records · APN 055-590-072-9

Assessment roll updated July 14, 2026 · Last verified July 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	Individual Name on File
Mailing Address	2420 MAMMOTH WAY, ANTIOCH, CA 94531-9085
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Unmarried Woman

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Sale	Sep 30, 2016 · Amount on Record
Deed Sale	Sep 30, 2016 · Amount on Record
Prior Sale	Dec 09, 2004 · Amount on Record
Deed Document Number	2016203673
Last Transfer Date	Oct 17, 2016
Transfer Doc	0000218243
Record Updated	Sep 20, 2026

November 2025: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Nov 19, 2025
Property Address	2420 MAMMOTH WAY, ANTIOCH, CA 94531-9085
Document Number	0000130328
Map Reference	MB 416 PG 37
Instrument Date	Nov 17, 2025
Instrument	2025- 130328
Transaction Type	Transfer
Record Updated	Dec 02, 2025

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2420 MAMMOTH WAY, ANTIOCH, CA 94531-9085

Tax Assessment & Valuation

Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026

Property Jurisdictions

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

Tax Bill & Assessment History

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

Year	Tax Bill	Assessed Value
2026		$690,000 (+38.26%) Land $150,000 Building $540,000
2025	$5,908.00 (+6.16%)	$499,047 (+4.04%) Land $116,056 Building $382,991
2023	$5,565.00 (+1.57%)	$479,670 Land $111,550 Building $368,120
2022	$5,479.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of October 12, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Wildfire

Wildfire Risk	High above 73% of the US · above 48% of California
Wildfire Likelihood	0.5% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL	5,000 / 5,000
Xfinity Cable	2,000 / 250

May also be available: Verizon.

Based on FCC filings for 389 locations within half a mile of this property.

Cell Coverage

5G (outdoors only) and 4G LTE

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	CITY OF ANTIOCH serves 116,781 people
Water Source	Surface water
Last State Inspection	Jan 2024
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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.