Lake County property record for 421 N Harth Ave, Madison, SD 57042
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 9 ba · 1,740 sqft · built 1899 |
| Lot Size | 0.14 acres (6,098 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $1,446 (2026) |
| Flood Zone | Zone AE (high risk) |
| APN | 21120-01000-000-10 |
| Primary APN | 21120-01000-000-10 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 9 Baths |
| Stories | 2 Stories |
| Building Area | 1,740 sqft Living Area |
| Basement Area | 870 sqft |
| Unfinished Basement | 870 sqft |
| Year Built | Built 1899 |
|---|---|
| Effective Year Built | Effective 1899 |
| Lot Area | 6,098 sqft (0.14 acres) |
| Garage Type | Detached |
| Garage Area | 384 sqft |
| Street Address | 421 N HARTH AVE |
|---|---|
| City | MADISON |
| State | SD |
| Zip | 57042-2220 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | E74'N83' BLK 10 KENNEDY'S EXT #1358M |
| Legal Block | 10 |
| Legal Lot Number | 10 |
| Jurisdiction | LAKE SD |
| Township / Civil Division | MADISON |
| Census Block Group | 2 |
| Census Block | 2083 |
| Census Tract | 960202 |
421 N Harth Ave is owned and occupied by two individuals.
Source: Lake County records, as of September 23, 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 File |
|---|---|
| Mailing Address | 421 N HARTH AVE, MADISON, SD 57042-2220 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 421 N Harth Ave was $1,446, up 79.6% from the year before.
Source: Lake County assessment roll, as of October 24, 2025
| Type | Name |
|---|---|
| State | South Dakota |
| County | Lake County |
| Municipality | Madison City |
| Unified School District | Madison Central School District 39-2 (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $1,446.00 (+79.63%) | $100,300 (-) Land $18,100 Building $82,200 | $100,300 Land $18,100 Building $82,200 |
| 2025 | $805.00 | $100,300 (+105.11%) Land $18,100 Building $82,200 | |
| 2024 | $805.00 (-1.83%) | $48,900 (-47.98%) Land $7,400 Building $41,500 | |
| 2023 | $820.00 (+10.07%) | $94,000 Land $15,700 Building $78,300 | |
| 2022 | $745.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 421 N Harth Ave in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective November 20, 2024 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 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 File median of 42 policies |
| Community Rating System | Class 8 (10% premium discount) |
| Nearby Flood Policies | 42 in force |
| Nearby Flood Claims | 21 (1993–2019) |
| Claims Outside the SFHA | 5 of 21 |
| Most Recent Claim | Sep 2019 · Severe Storms, Tornadoes, And Flooding |
| Claims by Event |
|
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.
The area around 421 N Harth Ave has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | MADISON serves 6,191 people · EPA ID SD4600199 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Sep 2024 |
| Lead | 2 ppb (2023) action level 15 ppb |
| 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.
Source: FCC Broadband Data Collection, based on 389 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Midco Cable | 1,250 / 60 |
| Bluepeak Cable · Fiber in parts of the area | 1,000 / 30 |
| Starlink Satellite | 280 / 30 |
May also be available: Interlakes Wireless, Verizon.
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