Hamilton County, Iowa
9 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-03
Compared to top-scoring counties, Hamilton County's 9 ZIP codes land in the middle tier — some meet standards cleanly, others carry documented violations, and the gap between the best and worst areas is wider than average.
How Hamilton County Compares
How Hamilton County Compares
Hamilton County scores 2 points below the Iowa state average (59/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Hamilton County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 9.8%, diabetes 12.1%)
Estimated additional annual cost per homeowner: $958, driven primarily by water_lead
Infrastructure: 0.53% avg pipe failure probability, 100% of ZIPs at high risk
84% 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: $958
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,135 housing units in Hamilton 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 Hamilton County
Remediation costs are relatively manageable for most homeowners in Hamilton 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 Hamilton 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 Hamilton County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Xenia Rwd (des Moines) | 12,860 | 11 |
| 2 | Xenia Rwd (boone) | 4,975 | 4 |
| 3 | Xenia Rwd (north) | 6,122 | 4 |
| 4 | Stratford Muni Water Department | 707 | 4 |
| 5 | Stanhope Water Department | 364 | 3 |
11 total water systems serve Hamilton County.
All ZIP Codes in Hamilton County
9 ZIP codes tracked in Hamilton County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 50034 | Blairsburg | 66 | C | 0 | $113K |
| 2 | 50231 | Randall | 66 | C | 0 | $106K |
| 3 | 50271 | Williams | 66 | C | 1 | $138K |
| 4 | 50595 | Webster City | 65 | C | 0 | $129K |
| 5 | 50075 | Ellsworth | 64 | C | 2 | $140K |
| 6 | 50249 | Stratford | 59 | C | 4 | $109K |
| 7 | 50130 | Jewell | 48 | D | 1 | $143K |
| 8 | 50246 | Stanhope | 42 | D | 3 | $118K |
| 9 | 50132 | Kamrar | 40 | D | 0 | $120K |
Recommended Buyer Guides for Hamilton County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance — guides surface only when county data warrants them.
- Best Lead Paint Test Kits — 84% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Hamilton County, Iowa
Overview
Hamilton County in Iowa covers 9 ZIP codes with an average Home Safety Score of C (57/100).
5 of 9 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.