The 2025 property tax bill for 503 William St was $196.
Source: Iowa County assessment roll, as of April 21, 2026
Property Jurisdictions
Type
Name
State
Wisconsin
Municipality
Avoca Village
County
Iowa County
Unified School District
Riverdale School District (PK - 12)
Tax Bill & Assessment History
Year
Tax Bill
Assessed Value
Assessed Market Value
2025
$196.00
$10,300Land $10,300
$9,901Land $9,901
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 503 William St in Zone X, an area of moderate flood risk, though there have been 8 flood claims nearby since 2000.
Source: FEMA National Flood Hazard Layer, effective December 15, 2015 · OpenFEMA NFIP redacted claims and policies, as of September 2026
FEMA Flood Zone
Zone X moderate risk
500-Year Floodplain
Yes 0.2% annual chance
Flood Insurance Requirement
Not required lenders may require it
Nearby Flood Policies
2 in force
Nearby Flood Claims
8 (2000–2008)
Claims Outside the SFHA
1 of 8
Most Recent Claim
Jun 2008 · Severe Storms, Tornadoes, And Flooding
Claims by Event
Severe Storms, Tornadoes, And Flooding, Jun 2008 · 8 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 503 William 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
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
AVOCA WATERWORKS serves 545 people · EPA ID WI1250074
Water Source
Groundwater
Last State Inspection
May 2025
Lead
Under 1 ppb (2023) action level 15 ppb
Violations Reported to EPA
Water Quality
None last 10 years
Treatment and Procedure
Lead service line inventory Oct 2024 No certified operator Jul 2024
Monitoring and Reporting
2 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 50 locations within half a mile, as of December 31, 2025