Hancock County, Iowa
8 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
Across Hancock County, EPA compliance data for 8 ZIP codes sits at a moderate level — not alarming, but not uniformly clean either.
How Hancock County Compares
How Hancock County Compares
Hancock County scores 5 points above the Iowa state average (59/100) and 4 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Hancock County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.5 (asthma 9.8%, diabetes 12.6%)
Estimated additional annual cost per homeowner: $895, driven primarily by water_lead
Infrastructure: 0.534% avg pipe failure probability, 100% of ZIPs at high risk
87.9% 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: $895
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,662 housing units in Hancock 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 Hancock County
Remediation costs are relatively manageable for most homeowners in Hancock 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 Hancock 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 Hancock County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Woden Water Supply | 188 | 5 |
| 2 | Britt Water Works | 2,064 | 3 |
| 3 | Crystal Lake Water Supply | 255 | 1 |
| 4 | Goodell Water Supply | 140 | 1 |
| 5 | Klemme Water Works | 441 | 1 |
8 total water systems serve Hancock County.
All ZIP Codes in Hancock County
8 ZIP codes tracked in Hancock County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 50430 | Corwith | 66 | C | 0 | $71K |
| 2 | 50438 | Garner | 66 | C | 0 | $177K |
| 3 | 50447 | Kanawha | 66 | C | 0 | $82K |
| 4 | 50432 | Crystal Lake | 65 | C | 1 (1 health) | $86K |
| 5 | 50439 | Goodell | 64 | C | 1 | $91K |
| 6 | 50449 | Klemme | 64 | C | 1 | $99K |
| 7 | 50423 | Britt | 62 | C | 3 | $110K |
| 8 | 50484 | Woden | 61 | C | 5 | $111K |
Recommended Buyer Guides for Hancock County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 87.9% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Hancock County, Iowa
Overview
Hancock County in Iowa covers 8 ZIP codes with an average Home Safety Score of C (64/100).
5 of 8 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← 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.