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521 Bay St, Mukwonago, WI 53149 Property Records

Waukesha County property record for 521 Bay St, Mukwonago, WI 53149

Property Summary

Property TypeSingle Family Home
Details2 bd · 1 ba · built 1945
Lot Size0.75 acres (32,670 sqft)
OwnerIndividual Name on File
Tax Bill$4,070 (2025)
Deeds & MortgagesJul 2021 Transfer
Jul 2021 Transfer
Flood ZoneZone AE (high risk)
APNMUKV-1974-965

Property Details

APN / Parcel Number

Primary APNMUKV-1974-965

Interior

Bedrooms2 Beds
Full Baths1 Bath
Total Rooms5 Rooms
Stories1 Story
1st Floor Area432 sqft
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1945
Effective Year BuiltEffective 1945
Architectural StyleCottage
Exterior MaterialWood Siding
Lot Area32,670 sqft (0.75 acres)
Garage TypeAttached
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Cooling SystemNone
Heating SystemForced Air with A/C

Location & Zoning

Street Address521 BAY ST
CityMUKWONAGO
StateWI
Zip53149-1320
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionPT NW1/4 SEC 26 T5N R18E; COM CNTR 1887 FT & W 115.5 FT N OF CNTR OF SEC; N82W 116 FT 1 IN TO BGN; N82W 101 FT; N 320 FT TO S LINE OF ARTHUR ST; E ON S LINE OF ROAD 100 FT; S 334 FT TO BGN
Legal Range18E
Legal Township5N
Legal Section26
Legal SubdivisionGIBSONS
Legal Block18
Legal Lot Number5,M,N
JurisdictionWAUKESHA WI
Township / Civil DivisionMUKWONAGO
Census Block Group1
Census Block1033
Census Tract203901

Owner

521 Bay St is owned and occupied by an individual who acquired it in July 2021.

Source: Waukesha County records, as of June 25, 2026

Owner of RecordIndividual Name on File
Mailing Address521 BAY ST, MUKWONAGO, WI 53149-1320
OccupancyOwner Occupied
Owner TypeIndividual

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

DateDocument
Jul 28, 2021Transfer on Death Deed, Transfer
Jul 28, 2021Intrafamily Transfer, Transfer

Assessor's Deed Record

Deed NamesName on Deed
Last Transfer DateJul 21, 2021
Transfer Doc0004604464
Record UpdatedSep 20, 2026

July 2021: Transfer on Death Deed, Transfer

Document TypeTransfer on Death Deed
JurisdictionWAUKESHA WI
Recording DateJul 28, 2021
Property Address521 BAY ST, MUKWONAGO, WI 53149-1320
Document Number0004604464
Instrument DateJul 23, 2021
Instrument4604464
Transaction TypeTransfer
Record UpdatedAug 18, 2021

Transaction

Tax$0.00
Amount AccuracyTransfer Tax Exempt
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address521 BAY ST, MUKWONAGO, WI 53149-1320

July 2021: Intrafamily Transfer, Transfer

Document TypeIntrafamily Transfer
JurisdictionWAUKESHA WI
Recording DateJul 28, 2021
Property Address521 BAY ST, MUKWONAGO, WI 53149-1320
Document Number0004604465
Instrument DateJul 23, 2021
Instrument4604465
Transaction TypeTransfer
Record UpdatedAug 18, 2021

Transaction

Tax$0.00
Amount AccuracyTransfer Tax Exempt
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name

Tax Assessment & Valuation

The 2025 property tax bill for 521 Bay St was $4,070.

Source: Waukesha County assessment roll, as of June 23, 2026

Property Jurisdictions

TypeName
StateWisconsin
CountyWaukesha County
MunicipalityMukwonago Village
Unified School DistrictMukwonago School District (PK - 12)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2025$4,070.00$328,600 Land $226,000 Building $102,600$347,900
2023$3,244.00 Homeowner's exemption$177,000 Land $78,500 Building $98,500$250,700

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

Flood

FEMA maps place 521 Bay St in Zone AE, a high-risk flood area within the regulatory floodway; flood insurance is required for federally backed loans.

Source: FEMA National Flood Hazard Layer, effective October 19, 2025 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone AE
high risk
100-Year FloodplainYes
1% annual chance
FloodwayYes
Base Flood ElevationVaries along the reach; see FIRM
Flood Insurance RequirementRequired
federally backed loans
Nearby Flood Policies1 in force

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 521 Bay St is low, with less than a 0.01% annual chance of wildfire.

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

Wildfire RiskLow
lower than 94% of the US · lower than 83% of Wisconsin
Wildfire LikelihoodUnder 0.01% annual chance
ExposureDirect
burnable vegetation

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 SystemMUKWONAGO WATERWORKS
serves 8,190 people · EPA ID WI2680209
Water SourceGroundwater
Last State InspectionMar 2024
Lead3 ppb (2023)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and Reporting2
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. The service area is an EPA estimate; the actual supplier may differ.

Internet Providers

Source: FCC Broadband Data Collection, based on 218 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Spectrum
Cable · Fiber in parts of the area		1,000 / 1,000
T-Mobile
Fixed Wireless		100 / 20

May also be available: Verizon.

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