Louisa County, Iowa
10 ZIP codes · Avg score 60/100 · Grade C · Updated 2026-06-03
Within Louisa County, safety data across 10 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Louisa County Compares
How Louisa County Compares
Louisa County scores 1 points above the Iowa state average (59/100) and 8 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Louisa County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.9 (asthma 9.8%, diabetes 12.7%)
Estimated additional annual cost per homeowner: $927, driven primarily by flood
Infrastructure: 0.461% avg pipe failure probability, 80% of ZIPs at high risk
70.5% 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: $927
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,239 housing units in Louisa 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 Louisa County
Remediation costs are relatively manageable for most homeowners in Louisa 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 Louisa 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 Louisa County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Lone Tree Muni Water System | 1,357 | 4 |
| 2 | Rathbun Reg Wtr Assn (burlington) | 8,375 | 2 |
| 3 | Oakville Water Supply | 200 | 2 |
| 4 | Wapello Municipal Water Works | 2,096 | 2 |
| 5 | Woodland Wapello Mobile Home Park | 126 | 2 |
11 total water systems serve Louisa County.
All ZIP Codes in Louisa County
10 ZIP codes tracked in Louisa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 52752 | Grandview | 68 | C | 2 | $117K |
| 2 | 52640 | Morning Sun | 66 | C | 0 | $126K |
| 3 | 52737 | Columbus City | 65 | C | 2 | $104K |
| 4 | 52738 | Columbus Junction | 64 | C | 2 | $136K |
| 5 | 52755 | Lone Tree | 64 | C | 4 | $220K |
| 6 | 52653 | Wapello | 59 | C | 2 | $152K |
| 7 | 52646 | Oakville | 58 | C | 2 | $150K |
| 8 | 52739 | Conesville | 53 | D | 0 | $100K |
| 9 | 52749 | Fruitland | 53 | D | 0 | $219K |
| 10 | 52754 | Letts | 53 | D | 0 | $196K |
Recommended Buyer Guides for Louisa County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 70.5% 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 Louisa County, Iowa
Overview
Louisa County in Iowa covers 10 ZIP codes with an average Home Safety Score of C (60/100).
6 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.