4535 Grothman Ln, Martinez, CA 94553 Property Records

Contra Costa County property record for 4535 Grothman Ln, Martinez, CA 94553

Property Summary

Property Type	Single Family Home
Details	3 bd · 2.5 ba · 2,263 sqft · built 1951
Lot Size	0.25 acres (10,890 sqft)
Owner	Individual Name on File
Last Sale	$662,000 (Apr 2013)
Tax Bill	$10,454 (2025)
Flood Zone	Zone AO (high risk)
APN	`162-242-021-2`

Property Details

APN / Parcel Number

Primary APN	`162-242-021-2`
Alternative APN	`162-242-021`

Interior

Bedrooms	3 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	7 Rooms
Stories	1 Story
Building Area	2,263 sqft Living Area
1st Floor Area	2,263 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1951
Effective Year Built	Effective 2000
Architectural Style	Ranch
Exterior Material	Wood
Roof Material	Composition Shingle
Lot Area	10,890 sqft (0.25 acres)
Garage Type	Attached
Garage Area	475 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Heating System	Floor/Wall Furnace
Heating Fuel	Gas
Sewer	Septic
Water Source	Commercial

Location & Zoning

Street Address	4535 GROTHMAN LN
City	MARTINEZ
State	CA
Zip	94553-4411
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10
Legal Description	POR RO EL PINOLE
Legal Subdivision	RANCHO EL PINOLE
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	3
Census Block	3002
Census Tract	321103

Owner

Source: Contra Costa County records · APN 162-242-021-2

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	4535 GROTHMAN LN, MARTINEZ, CA 94553-4411
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Sale	Apr 30, 2013 · Amount on Record
Deed Sale	Apr 30, 2013 · Amount on Record
Prior Sale	Nov 04, 2004 · Amount on Record
Deed Document Number	2013106786
Record Updated	Sep 20, 2026

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	Martinez City
Unified School District	Martinez 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		$831,498 (+2%) Land $552,660 Building $278,838
2025	$10,454.00 (+6.5%) Homeowner's exemption	$815,195 (+4.04%) Land $541,824 Building $273,371
2023	$9,816.00 (+1.7%) Homeowner's exemption	$783,541 Land $520,785 Building $262,756
2022	$9,652.00

Flood & Wildfire

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

Flood

FEMA Flood Zone	Zone AO high risk · sheet flow 1–3 ft
100-Year Floodplain	Yes 1% annual chance
Floodway	No
Base Flood Elevation	Varies along the reach; see FIRM
Flood Insurance Requirement	Required federally backed loans
Flood Insurance Cost	Premium on Record median of 27 policies
Nearby Flood Policies	27 in force
Nearby Flood Claims	21 (1982–2023)
Claims Outside the SFHA	3 of 21
Most Recent Claim	Jan 2023 · Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Winter Storms, Flooding, Landslides, And Mudslides, Jan 2023 · 2 claims Severe Storms, Flooding, Mud And Landslides, Jan 1997 · 4 claims Severe Winter Storms, Flooding, Landslides, Mud Flows, Jan 1995 · 4 claims

Wildfire

Wildfire Risk	High above 70% of the US · above 45% of California
Wildfire Likelihood	0.3% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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.

Internet Providers

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

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

May also be available: Radiate Holdings, T-Mobile USA, Unwired, Verizon.

Based on FCC filings for 212 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 MARTINEZ serves 31,015 people
Water Source	Purchased surface water from CONTRA COSTA WATER DISTRICT
Last State Inspection	Oct 2025
Lead	Under 1 ppb (2023–2025) 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.