Jo Daviess County, Illinois
10 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-03
Water safety in Jo Daviess County is uneven — some of its 10 ZIP codes meet standards cleanly while others carry documented violations.
How Jo Daviess County Compares
How Jo Daviess County Compares
Jo Daviess County scores 5 points below the Illinois state average (61/100) and 12 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Jo Daviess County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.4 (asthma 9.9%, diabetes 13.2%)
Estimated additional annual cost per homeowner: $1,237, driven primarily by flood
Infrastructure: 0.409% avg pipe failure probability, 70% of ZIPs at high risk
71.9% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Jo Daviess County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 3 violations. Past 5 years: 4 total (4 health-based).
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: $1,237
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,265 housing units in Jo Daviess 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 Jo Daviess County
Remediation costs are relatively manageable for most homeowners in Jo Daviess 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 Jo Daviess 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 Jo Daviess County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | East Dubuque | 1,565 | 9 |
| 2 | Prairie Path Water-bahl Water Company | 700 | 9 |
| 3 | Prairie Path Water Company-apple Canyon | 931 | 8 |
| 4 | WARREN | 1,323 | 7 |
| 5 | Prairie Path Water Company-galena | 2,294 | 7 |
15 total water systems serve Jo Daviess County.
All ZIP Codes in Jo Daviess County
10 ZIP codes tracked in Jo Daviess County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 61041 | Hanover | 70 | B | 0 | $112K |
| 2 | 60125 | Carol Stream | 68 | C | 2 | — |
| 3 | 61028 | Elizabeth | 68 | C | 1 | $185K |
| 4 | 61036 | Galena | 60 | C | 6 (2 health) | $258K |
| 5 | 61001 | Apple River | 55 | C | 1 | $261K |
| 6 | 61085 | Stockton | 55 | C | 1 | $115K |
| 7 | 61087 | Warren | 51 | D | 5 | $110K |
| 8 | 61025 | East Dubuque | 47 | D | 3 | $174K |
| 9 | 61075 | Scales Mound | 42 | D | 1 | $236K |
| 10 | 61059 | Nora | 40 | D | 0 | $74K |
Recommended Buyer Guides for Jo Daviess County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 71.9% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Jo Daviess County, Illinois
Overview
Jo Daviess County in Illinois covers 10 ZIP codes with an average Home Safety Score of C (56/100).
8 of 10 ZIP codes have recorded EPA violations. 2 health-based violations have been documented.
← Back to Illinois 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.