10421 River Rd, Potomac, MD 20854 Property Records

Montgomery County property record for 10421 River Rd, Potomac, MD 20854

Property Summary

Property Type	Single Family Home
Details	10.5 ba · 9,206 sqft · built 1954
Lot Size	3.41 acres (148,540 sqft)
Owner	2 Trust Names on File
Last Sale	$1,510,000 (Mar 2011)
Tax Bill	$29,287 (2025)
Deeds & Mortgages	Jun 2023 Line of Credit
Flood Zone	Zone X (minimal risk)
APN	`10-00857680`

Property Details

APN / Parcel Number

Primary APN	`10-00857680`
Alternative APN	`00857680`

Interior

Full Baths	10.5 Baths
Half Baths	3 Half Baths
Stories	2 Stories
Building Area	9,206 sqft Living Area
Gross Area	10,281 sqft
1st Floor Area	6,701 sqft
Basement Area	250 sqft
Finished Basement	250 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1954
Effective Year Built	Effective 1954
Architectural Style	Bi-Level
Exterior Material	Stucco
Construction Type	Brick
Roof Material	Composition Shingle
Lot Area	148,540 sqft
Garage Type	Attached
Garage Area	1,075 sqft
Parking Spaces	4 Parking Spaces

Exterior Amenities

Pool Area	800 sqft
Porch	Open Porch
Deck Area	782 sqft
Shed	1 Shed
Shed Area	144 sqft
Bath House	240 sqft
Tennis Court	Tennis Court

Utilities, Heating & Cooling

Cooling System	Central
Heating System	HVAC
Sewer	Connected

Location & Zoning

Account Number	00857680
Street Address	10421 RIVER RD
City	POTOMAC
State	MD
Zip	20854-4912
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	RE2
Legal Description	POTOMAC FARM ESTS
Legal Subdivision	KNOLLWOOD
Legal Block	A
Legal Lot Number	1
Jurisdiction	MONTGOMERY MD
Township / Civil Division	10
Census Block Group	3
Census Block	3007
Census Tract	706005

Owner

10421 River Rd is owner-occupied and held in a trust since August 2024.

Source: Montgomery County records, as of August 17, 2026

Owner of Record	2 Trust Names on File
Mailing Address	10421 RIVER RD, POTOMAC, MD 20854-4912
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

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 31, 2011 · Amount on File
Deed Sale	Mar 31, 2011 · Amount on File
Prior Sale	Mar 31, 2011 · Amount on File
Deed Book / Page	41386 / 442
Last Transfer Date	Aug 28, 2024
Transfer Doc	0683950496
Record Updated	Sep 20, 2026

June 2023: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MONTGOMERY MD
Property Address	10421 RIVER RD, POTOMAC, MD 20854-4912
Transaction Type	Mortgage
Record Updated	Jun 28, 2023
Title Company	NOT AVAILABLE, RGS TITLE LLC MATS

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0671010314
Date	Jun 14, 2023
Book Page	67101/314

Lender

Name	MANUFACTURERS & TRADERS TRUST CO
Type	Bank
Address	BUFFALO, NY 14203

Agreement

Type	Line of Credit
Amount	Amount on Record

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

Tax Assessment & Valuation

The 2025 property tax bill for 10421 River Rd was $29,287, up 1.6% from the year before.

Source: Montgomery County assessment roll, as of August 17, 2026

Property Jurisdictions

Type	Name
State	Maryland
County	Montgomery County
Unified School District	Montgomery County Public Schools (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$2,620,900 (+3.5%) Land $1,230,700 Building $1,390,200	$2,620,900 (+3.5%) Land $1,230,700 Building $1,390,200
2025	$29,287.00 (+1.59%)	$2,532,200 Land $1,230,700 Building $1,301,500	$2,532,200 Land $1,230,700 Building $1,301,500
2024	$28,828.00
2023		$2,351,067	$2,532,200 Land $1,230,700 Building $1,301,500
2022	$24,899.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 10421 River Rd in Zone X, an area of minimal flood risk, though there have been 5 flood claims nearby since 1979.

Source: FEMA National Flood Hazard Layer, effective April 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on File median of 12 policies
Nearby Flood Policies	12 in force
Nearby Flood Claims	5 (1979–2025)
Claims Outside the SFHA	4 of 5
Most Recent Claim	Jul 2025 · rainfall accumulation

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 10421 River Rd is low, with a 0.01% annual chance of wildfire.

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

Wildfire Risk	Low lower than 80% of the US · above 41% of Maryland
Wildfire Likelihood	0.01% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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	WASHINGTON SUBURBAN SANITARY COMMISSION serves 1,900,000 people · EPA ID MD0150005
Water Source	Surface water
Last State Inspection	May 2025
Lead	Under 1 ppb (2018–2020) 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 73 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Verizon Fiber	2,300 / 2,300
Xfinity Cable	1,200 / 35

May also be available: T-Mobile.

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