Iowa County, Wisconsin
14 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
Tracking 14 ZIP codes in Iowa County reveals a mixed picture — tap water quality varies meaningfully by location.
How Iowa County Compares
How Iowa County Compares
Iowa County scores 2 points below the Wisconsin state average (66/100) and 4 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Iowa County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.1 (asthma 10.5%, diabetes 11.3%)
Estimated additional annual cost per homeowner: $746, driven primarily by energy_code_gap
Infrastructure: 0.396% avg pipe failure probability, 54% of ZIPs at high risk
63.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Iowa County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 12 violations. Past 5 years: 16 total (16 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $746
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
12,263 housing units in Iowa County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Iowa County
Remediation costs are relatively manageable for most homeowners in Iowa County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Iowa County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Iowa County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Bit O Green Llc Mhp | 49 | 27 |
| 2 | Spring Green Waterworks | 1,626 | 17 |
| 3 | House on the Rock Resort | 470 | 17 |
| 4 | Spring Green Estates | 300 | 17 |
| 5 | Spring Green Estates South | 40 | 17 |
19 total water systems serve Iowa County.
All ZIP Codes in Iowa County
14 ZIP codes tracked in Iowa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53533 | Dodgeville | 70 | B | 1 | $255K |
| 2 | 53526 | Cobb | 69 | C | 4 (1 health) | $176K |
| 3 | 53506 | Avoca | 68 | C | 3 (2 health) | $145K |
| 4 | 53507 | Barneveld | 67 | C | 6 (3 health) | $311K |
| 5 | 53535 | Edmund | 66 | C | 0 | — |
| 6 | 53543 | Highland | 66 | C | 0 | $199K |
| 7 | 53553 | Linden | 66 | C | 1 | $169K |
| 8 | 53580 | Rewey | 66 | C | 1 | $154K |
| 9 | 53595 | Dodgeville | 66 | C | 1 | — |
| 10 | 53503 | Arena | 65 | C | 10 | $230K |
| 11 | 53544 | Hollandale | 65 | C | 3 (1 health) | $338K |
| 12 | 53588 | Spring Green | 64 | C | 17 (1 health) | $274K |
| 13 | 53582 | Ridgeway | 56 | C | 3 (2 health) | $231K |
| 14 | 53565 | Mineral Point | 43 | D | 3 (2 health) | $254K |
Recommended Buyer Guides for Iowa County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 63.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Iowa County, Wisconsin
Overview
Iowa County in Wisconsin covers 14 ZIP codes with an average Home Safety Score of C (64/100).
12 of 14 ZIP codes have recorded EPA violations. 12 health-based violations have been documented.
← Back to Wisconsin water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.