Allen County, Ohio
16 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
Although much of Allen County meets baseline standards, some of its 16 ZIP codes show violations that merit closer attention.
How Allen County Compares
How Allen County Compares
Allen County scores 5 points below the Ohio state average (60/100) and 13 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Allen County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.8 (asthma 11.1%, diabetes 14.3%)
Estimated additional annual cost per homeowner: $1,807, driven primarily by flood
Infrastructure: 0.435% avg pipe failure probability, 56% of ZIPs at high risk
78% of homes built before 1978 (lead paint era)
Violation History (2022–2024)
→ Stable trendEPA violation counts by year across Allen County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 8 violations. Past 5 years: 16 total (16 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: $1,807
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
48,564 housing units in Allen 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 Allen County
Remediation costs are relatively manageable for most homeowners in Allen 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 Allen 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 Allen County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Lima City | 65,619 | 78 |
| 2 | Brook Park Estates Mhp | 75 | 78 |
| 3 | Lakeside Estates Mhp | 45 | 78 |
| 4 | Green Meadow Mhp-hancock Company | 30 | 78 |
| 5 | SPENCERVILLE VILLAGE | 2,261 | 37 |
12 total water systems serve Allen County.
All ZIP Codes in Allen County
16 ZIP codes tracked in Allen County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 45850 | Harrod | 68 | C | 1 | $178K |
| 2 | 45808 | Beaverdam | 66 | C | 0 | $100K |
| 3 | 45887 | Spencerville | 66 | C | 2 | $185K |
| 4 | 45802 | Lima | 64 | C | 13 (2 health) | — |
| 5 | 45801 | Lima | 63 | C | 13 (2 health) | $112K |
| 6 | 45804 | Lima | 63 | C | 13 (2 health) | $96K |
| 7 | 45805 | Lima | 63 | C | 13 (2 health) | $154K |
| 8 | 45806 | Lima | 63 | C | 13 (2 health) | $190K |
| 9 | 45807 | Lima | 63 | C | 13 (2 health) | $193K |
| 10 | 45833 | Delphos | 54 | D | 9 | $156K |
| 11 | 45817 | Bluffton | 52 | D | 1 | $195K |
| 12 | 45809 | Gomer | 40 | D | 0 | $99K |
| 13 | 45820 | Cairo | 40 | D | 0 | $108K |
| 14 | 45838 | Elgin | 40 | D | 0 | $114K |
| 15 | 45854 | Lafayette | 40 | D | 0 | $122K |
| 16 | 45894 | Venedocia | 40 | D | 0 | $157K |
Recommended Buyer Guides for Allen County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Lead Paint Test Kits — 78% of homes built before 1978
- 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 Allen County, Ohio
Overview
Allen County in Ohio covers 16 ZIP codes with an average Home Safety Score of C (55/100).
10 of 16 ZIP codes have recorded EPA violations. 12 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.