Wayne County, Iowa
9 ZIP codes · Avg score 52/100 · Grade D · Updated 2026-06-03
Although conditions vary by area, Wayne County's 9 ZIP codes collectively show below-average water safety — health-based violations are documented throughout the county, and the overall grade reflects a pattern rather than isolated incidents.
How Wayne County Compares
How Wayne County Compares
Wayne County scores 7 points below the Iowa state average (59/100) and 16 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Wayne County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15 (asthma 10.2%, diabetes 13.2%)
Estimated additional annual cost per homeowner: $561, driven primarily by energy_code_gap
Infrastructure: 0.446% avg pipe failure probability, 89% of ZIPs at high risk
73.6% 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: $561
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,114 housing units in Wayne 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 Wayne County
Remediation costs are relatively manageable for most homeowners in Wayne 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 Wayne 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 Wayne County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Rathbun Regional Water Assn (rathbun) | 33,000 | 8 |
| 2 | HUMESTON WATER PLANT | 462 | 5 |
| 3 | Corydon Water Supply | 1,610 | 2 |
| 4 | Allerton Water Works | 430 | 1 |
| 5 | Garden Grove Water Supply | 179 | 1 |
7 total water systems serve Wayne County.
All ZIP Codes in Wayne County
9 ZIP codes tracked in Wayne County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 52590 | Seymour | 66 | C | 0 | $129K |
| 2 | 50008 | Allerton | 64 | C | 1 | $123K |
| 3 | 50060 | Corydon | 64 | C | 2 | $109K |
| 4 | 50123 | Humeston | 61 | C | 5 | $107K |
| 5 | 50147 | Lineville | 55 | C | 0 | $58K |
| 6 | 50052 | Clio | 40 | D | 0 | — |
| 7 | 50068 | Derby | 40 | D | 0 | $118K |
| 8 | 50165 | Millerton | 40 | D | 0 | $125K |
| 9 | 52583 | Promise City | 40 | D | 0 | $104K |
Recommended Buyer Guides for Wayne County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 73.6% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Wayne County, Iowa
Overview
Wayne County in Iowa covers 9 ZIP codes with an average Home Safety Score of D (52/100).
3 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.
What You Can Do
Wayne County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
73.6% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.