Seneca County, Ohio
12 ZIP codes · Avg score 50/100 · Grade D · Updated 2026-06-03
Unlike better-scoring counties, Seneca County records health-based violations across a meaningful portion of its 12 ZIP codes — the overall safety grade is well below average.
How Seneca County Compares
How Seneca County Compares
Seneca County scores 10 points below the Ohio state average (60/100) and 18 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Seneca County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.3 (asthma 10.8%, diabetes 13.5%)
Estimated additional annual cost per homeowner: $1,753, driven primarily by energy_code_gap
Infrastructure: 0.464% avg pipe failure probability, 92% of ZIPs at high risk
86.1% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Seneca County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 9 violations. Past 5 years: 17 total (17 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: $1,753
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
26,020 housing units in Seneca 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 Seneca County
Remediation costs are relatively manageable for most homeowners in Seneca 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 Seneca 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 Seneca County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Attica Village | 1,148 | 14 |
| 2 | Willard City | 7,099 | 13 |
| 3 | FOSTORIA CITY | 13,441 | 7 |
| 4 | Fostoria Mobile Estates | 281 | 7 |
| 5 | Evergreen Poplar Village Mhp | 128 | 7 |
11 total water systems serve Seneca County.
All ZIP Codes in Seneca County
12 ZIP codes tracked in Seneca County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 44815 | Bettsville | 69 | C | 3 (1 health) | $101K |
| 2 | 44867 | Republic | 64 | C | 3 | $146K |
| 3 | 44807 | Attica | 62 | C | 13 (2 health) | $131K |
| 4 | 44830 | Fostoria | 61 | C | 7 (1 health) | $110K |
| 5 | 44818 | Bloomville | 53 | D | 1 | $140K |
| 6 | 44841 | Kansas | 53 | D | 0 | $113K |
| 7 | 43407 | Burgoon | 40 | D | 0 | $207K |
| 8 | 44809 | Bascom | 40 | D | 0 | $130K |
| 9 | 44825 | Chatfield | 40 | D | 0 | $74K |
| 10 | 44854 | New Washington | 40 | D | 0 | $137K |
| 11 | 44861 | Old Fort | 40 | D | 0 | — |
| 12 | 44883 | Tiffin | 40 | D | 0 | $153K |
Recommended Buyer Guides for Seneca 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 Lead Paint Test Kits — 86.1% 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
Deep Dive Reports
Detailed analysis for Seneca County, Ohio
Overview
Seneca County in Ohio covers 12 ZIP codes with an average Home Safety Score of D (50/100).
5 of 12 ZIP codes have recorded EPA violations. 4 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.
What You Can Do
Seneca 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
86.1% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.