The 2025 property tax bill for 603 Mill St was $1,929 with a homeowner's exemption.
Source: Monroe County assessment roll, as of January 1, 2025
Property Jurisdictions
Type
Name
State
Wisconsin
County
Monroe County
Municipality
Sparta City
Unified School District
Sparta Area School District (PK - 12)
Tax Bill & Assessment History
Year
Tax Bill
Assessed Value
Assessed Market Value
2025
$1,929.00Homeowner's exemption
$137,000Land $20,600Building $116,400
$136,900
2023
$604.00Homeowner's exemption
$56,100Land $15,900Building $40,200
$55,200
Assessed value is set for property tax purposes, not a market price estimate; it is a fraction of this property's market value.
Flood
FEMA maps place 603 Mill St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective December 15, 2021 · OpenFEMA NFIP redacted claims and policies, as of September 2026
FEMA Flood Zone
Zone X minimal risk
Nearest Special Flood Hazard Area
Zone AE, within 500 ft
Flood Insurance Requirement
Not required lenders may require it
Nearby Flood Policies
3 in force
Nearby Flood Claims
7 (1978–2024)
Most Recent Claim
Jul 2024 · rainfall accumulation
Claims by Event
Severe Storms, Straight-line Winds, Flooding, Landslides, And Mud, Jul 2017 · 2 claims
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 603 Mill St 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 57% of Wisconsin
Wildfire Likelihood
0.01% annual chance
Exposure
Direct 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 System
SPARTA WATERWORKS serves 10,025 people · EPA ID WI6420297
Water Source
Groundwater
Last State Inspection
Jul 2023
Lead
1 ppb (2023) 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. The service area is an EPA estimate; the actual supplier may differ.
Internet Providers
Source: FCC Broadband Data Collection, based on 144 locations within half a mile, as of December 31, 2025