Harrison County, Iowa
10 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-03
Based on current EPA data, Harrison County's 10 ZIP codes reflect fair but mixed water safety.
How Harrison County Compares
How Harrison County Compares
Harrison County scores 4 points above the Iowa state average (59/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Harrison County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.7 (asthma 10%, diabetes 12.4%)
Estimated additional annual cost per homeowner: $1,136, driven primarily by flood
Infrastructure: 0.512% avg pipe failure probability, 90% of ZIPs at high risk
76.9% 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: $1,136
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,851 housing units in Harrison 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 Harrison County
Remediation costs are relatively manageable for most homeowners in Harrison 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 Harrison 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 Harrison County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | MISSOURI VALLEY WATER SUPPLY | 2,684 | 21 |
| 2 | Sunnyside Village Mhp Llc | 190 | 21 |
| 3 | Valley View Water Association | 65 | 21 |
| 4 | Little Sioux Water Department | 166 | 4 |
| 5 | Dunlap Water Supply | 1,035 | 3 |
11 total water systems serve Harrison County.
All ZIP Codes in Harrison County
10 ZIP codes tracked in Harrison County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 51564 | Pisgah | 70 | B | 0 | $108K |
| 2 | 51546 | Logan | 69 | C | 2 | $202K |
| 3 | 51557 | Mondamin | 69 | C | 2 | $161K |
| 4 | 51550 | Magnolia | 66 | C | 1 | $108K |
| 5 | 51556 | Modale | 66 | C | 1 | $110K |
| 6 | 51529 | Dunlap | 65 | C | 3 | $139K |
| 7 | 51545 | Little Sioux | 65 | C | 4 | $81K |
| 8 | 51579 | Woodbine | 65 | C | 1 | $182K |
| 9 | 51542 | Honey Creek | 53 | D | 0 | $362K |
| 10 | 51555 | Missouri Valley | 46 | D | 21 | $181K |
Recommended Buyer Guides for Harrison County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 76.9% 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 Harrison County, Iowa
Overview
Harrison County in Iowa covers 10 ZIP codes with an average Home Safety Score of C (63/100).
8 of 10 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.