Dubuque County, Iowa
18 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Across Dubuque County's 18 ZIP codes, water safety results are uneven — a portion of systems carry active or recent violations, while others meet standards without issues.
How Dubuque County Compares
How Dubuque County Compares
Dubuque County scores 1 points below the Iowa state average (59/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Dubuque County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.8 (asthma 9.9%, diabetes 10.9%)
Estimated additional annual cost per homeowner: $877, driven primarily by flood
Infrastructure: 0.398% avg pipe failure probability, 39% of ZIPs at high risk
62.6% of homes built before 1978 (lead paint era)
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: $877
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
43,360 housing units in Dubuque 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 Dubuque County
Remediation costs are relatively manageable for most homeowners in Dubuque 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 Dubuque 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 Dubuque County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Dubuque Water Works | 59,667 | 20 |
| 2 | Alpine Park | 932 | 20 |
| 3 | Terrace Heights | 548 | 20 |
| 4 | Table Mound Park | 455 | 20 |
| 5 | Super 20 Mobile Home Court | 236 | 20 |
20 total water systems serve Dubuque County.
All ZIP Codes in Dubuque County
18 ZIP codes tracked in Dubuque County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 52068 | Peosta | 70 | B | 0 | $346K |
| 2 | 52032 | Bernard | 66 | C | 0 | $260K |
| 3 | 52045 | Epworth | 66 | C | 0 | $249K |
| 4 | 52046 | Farley | 66 | C | 0 | $259K |
| 5 | 52056 | Luxemburg | 66 | C | 0 | $168K |
| 6 | 52002 | Dubuque | 64 | C | 4 | $273K |
| 7 | 52004 | Dubuque | 64 | C | 4 | — |
| 8 | 52033 | Cascade | 62 | C | 0 | $211K |
| 9 | 52040 | Dyersville | 60 | C | 1 | $230K |
| 10 | 52099 | Dubuque | 60 | C | 4 | — |
| 11 | 52001 | Dubuque | 59 | C | 4 | $169K |
| 12 | 52003 | Dubuque | 59 | C | 4 | $262K |
| 13 | 52078 | Worthington | 55 | C | 0 | $205K |
| 14 | 52066 | North Buena Vista | 53 | D | 0 | $83K |
| 15 | 52073 | Sherrill | 53 | D | 0 | $258K |
| 16 | 52039 | Durango | 45 | D | 0 | $270K |
| 17 | 52071 | Saint Donatus | 40 | D | 0 | $207K |
| 18 | 52079 | Zwingle | 40 | D | 0 | $248K |
Recommended Buyer Guides for Dubuque County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Lead Paint Test Kits — 62.6% 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 Dubuque County, Iowa
Overview
Dubuque County in Iowa covers 18 ZIP codes with an average Home Safety Score of C (58/100).
6 of 18 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Iowa 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.