Seminole County, Oklahoma
8 ZIP codes · Avg score 86/100 · Grade A · Updated 2026-06-03
Although county size varies, Seminole County's 8 ZIP codes share reliably safe tap water records and above-average compliance scores.
How Seminole County Compares
How Seminole County Compares
Seminole County scores 7 points above the Oklahoma state average (79/100) and 18 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Seminole County, Oklahoma
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17.1 (asthma 12.7%, diabetes 16.1%)
Estimated additional annual cost per homeowner: $1,905, driven primarily by wildfire
Infrastructure: 0.429% avg pipe failure probability, 63% of ZIPs at high risk
69.7% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Seminole County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 28 violations. Past 5 years: 65 total (65 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $1,905
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
10,775 housing units in Seminole 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 Seminole County
Remediation costs are relatively manageable for most homeowners in Seminole 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 Seminole 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 Seminole County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Bowlegs Lima Water | 2,500 | 164 |
| 2 | Sasakwa Rwd | 210 | 156 |
| 3 | Seminole Company Rw&swmd #3 | 337 | 153 |
| 4 | Tri-county Rwd #2 | 5,172 | 137 |
| 5 | Wewoka Public Works Authority | 3,450 | 134 |
16 total water systems serve Seminole County.
All ZIP Codes in Seminole County
8 ZIP codes tracked in Seminole County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 74854 | Maud | 98 | A | 3 | $84K |
| 2 | 74818 | Seminole | 95 | A | 0 | — |
| 3 | 74867 | Sasakwa | 93 | A | 22 (2 health) | $72K |
| 4 | 74849 | Konawa | 91 | A | 19 (1 health) | $95K |
| 5 | 74868 | Seminole | 90 | A | 0 | $103K |
| 6 | 74830 | Bowlegs | 86 | A | 5 (1 health) | $38K |
| 7 | 74884 | Wewoka | 70 | B | 134 (97 health) | $86K |
| 8 | 74837 | Cromwell | 66 | C | 19 (18 health) | $75K |
Recommended Buyer Guides for Seminole County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 69.7% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Seminole County, Oklahoma
Overview
Seminole County in Oklahoma covers 8 ZIP codes with an average Home Safety Score of A (86/100).
6 of 8 ZIP codes have recorded EPA violations. 119 health-based violations have been documented.
← Back to Oklahoma 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.