421 Swanzey St, Keystone, SD 57751 Property Records

Pennington County property record for 421 Swanzey St, Keystone, SD 57751

Property Summary

Property Type	Mobile Home
Details	3,136 sqft · built 1996
Lot Size	0.79 acres (34,412 sqft)
Owner	Individual Name on File
Tax Bill	$1,809 (2025)
Flood Zone	Zone AE (high risk)
APN	`70-09-151-015`

Property Details

APN / Parcel Number

Primary APN	`70-09-151-015`
Alternative APN	`60910`

Interior

Building Area	3,136 sqft Living Area

Exterior

Year Built	Built 1996
Effective Year Built	Effective 1996
Architectural Style	Mobile/Manufactured
Lot Area	34,412 sqft (0.79 acres)

Location & Zoning

Account Number	60910
Street Address	421 SWANZEY ST
City	KEYSTONE
State	SD
Zip	57751-2024
Property Category	Residential
Property Type	Residential > Prefabricated > Mobile Home
Legal Description	SWANZEY ADD, TRACT G
Legal Subdivision	SWANZEY ADD
Legal Tract	G
Jurisdiction	PENNINGTON SD
Township / Civil Division	KEYSTONE
Census Block Group	1
Census Block	1064
Census Tract	11005

Owner

Source: Pennington County records · APN 70-09-151-015

Assessment roll updated August 26, 2025 · Last verified April 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	421 SWANZEY ST, KEYSTONE, SD 57751-2024
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Record Updated	Jun 08, 2026

Tax Assessment & Valuation

Source: Pennington County records · Assessment roll updated August 26, 2025 · Last verified April 2026

Property Jurisdictions

Type	Name
State	South Dakota
County	Pennington County
Municipality	Keystone Town
Unified School District	Hill City School District 51-2 (PK - 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
2025	$1,809.00 (-10.53%)	$180,000 (+4.05%) Land $67,800 Building $112,200
2023	$2,022.00 (+12.27%)	$173,000 Land $67,800 Building $105,200
2022	$1,801.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of June 11, 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 AE high risk
100-Year Floodplain	Yes 1% annual chance
Floodway	Yes
Base Flood Elevation	Varies along the reach; see FIRM
Flood Insurance Requirement	Required federally backed loans
Flood Insurance Cost	Premium on Record median of 17 policies
Nearby Flood Policies	17 in force
Nearby Flood Claims	3 (1995–2001)
Claims Outside the SFHA	2 of 3
Most Recent Claim	Jul 2001 · river or lake flooding
Claims by Event	Flooding, May 1995 · 2 claims

Wildfire

Wildfire Risk	High above 71% of the US · above 81% of South Dakota
Wildfire Likelihood	0.3% annual chance
Exposure	Direct burnable vegetation at the parcel

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)
Starlink Satellite	280 / 30
Hanson Communications DSL · Fiber in parts of the area	100 / 20

May also be available: AT&T, T-Mobile USA, Verizon.

Based on FCC filings for 40 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	KEYSTONE serves 349 people
Water Source	Groundwater
Last State Inspection	Oct 2024
Lead	2 ppb (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.