Warren County, Ohio
13 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-03
Compared to top-scoring counties, Warren County's 13 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 Warren County Compares
How Warren County Compares
Warren County scores 4 points below the Ohio state average (60/100) and 12 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Warren County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12 (asthma 10%, diabetes 11.1%)
Estimated additional annual cost per homeowner: $1,305, driven primarily by flood
Infrastructure: 0.34% avg pipe failure probability, 15% of ZIPs at high risk
46.4% of homes built before 1978 (lead paint era)
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Warren County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 7 total (7 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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: $1,305
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
94,126 housing units in Warren 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 Warren County
Remediation costs are relatively manageable for most homeowners in Warren 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 Warren 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 Warren County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Western Water Company | 39,508 | 84 |
| 2 | Springboro Public Water System | 19,263 | 75 |
| 3 | WAYNESVILLE VILLAGE PWS | 4,100 | 70 |
| 4 | Frontier Campground | 100 | 70 |
| 5 | Warren County | 78,299 | 14 |
27 total water systems serve Warren County.
All ZIP Codes in Warren County
13 ZIP codes tracked in Warren County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 45050 | Monroe | 65 | C | 4 | $274K |
| 2 | 45066 | Springboro | 65 | C | 0 | $363K |
| 3 | 45005 | Franklin | 64 | C | 2 | $201K |
| 4 | 45036 | Lebanon | 64 | C | 3 | $318K |
| 5 | 45065 | South Lebanon | 63 | C | 4 | $313K |
| 6 | 45152 | Morrow | 61 | C | 6 (1 health) | $328K |
| 7 | 45140 | Loveland | 60 | C | 1 | $341K |
| 8 | 45068 | Waynesville | 56 | C | 70 (3 health) | $325K |
| 9 | 45039 | Maineville | 53 | D | 0 | $294K |
| 10 | 45162 | Pleasant Plain | 53 | D | 0 | $215K |
| 11 | 45404 | Dayton | 44 | D | 5 (1 health) | $82K |
| 12 | 45032 | Harveysburg | 40 | D | 0 | $150K |
| 13 | 45034 | Kings Mills | 40 | D | 0 | $312K |
Recommended Buyer Guides for Warren County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Warren County, Ohio
Overview
Warren County in Ohio covers 13 ZIP codes with an average Home Safety Score of C (56/100).
8 of 13 ZIP codes have recorded EPA violations. 5 health-based violations have been documented.
← Back to Ohio 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.