Stephens County, Oklahoma
7 ZIP codes · Avg score 71/100 · Grade B · Updated 2026-06-03
Throughout Stephens County, the 7 monitored ZIP codes show low violation rates and healthy safety scores — a pattern that puts the county well above the state baseline for drinking water quality.
How Stephens County Compares
How Stephens County Compares
Stephens County scores 8 points below the Oklahoma state average (79/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Stephens County, Oklahoma
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.6 (asthma 11.6%, diabetes 14.2%)
Estimated additional annual cost per homeowner: $971, driven primarily by flood
Infrastructure: 0.407% avg pipe failure probability, 43% of ZIPs at high risk
72.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Stephens County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 23 violations. Past 5 years: 64 total (64 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: $971
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
20,272 housing units in Stephens 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 Stephens County
Remediation costs are relatively manageable for most homeowners in Stephens 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 Stephens 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 Stephens County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Stephens Company Rwd #5 | 6,426 | 42 |
| 2 | Jefferson Company Cons Rwd #1 | 8,398 | 42 |
| 3 | Stephens Company Rwd #3 (meridian) | 1,610 | 42 |
| 4 | Duncan Public Utilities Authority | 23,000 | 30 |
| 5 | Comanche Public Works Authority | 1,649 | 28 |
8 total water systems serve Stephens County.
All ZIP Codes in Stephens County
7 ZIP codes tracked in Stephens County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 73491 | Velma | 91 | A | 8 | $110K |
| 2 | 73055 | Marlow | 90 | A | 4 (2 health) | $154K |
| 3 | 73442 | Loco | 66 | C | 0 | $134K |
| 4 | 73529 | Comanche | 65 | C | 28 (15 health) | $111K |
| 5 | 73534 | Duncan | 63 | C | 10 (5 health) | — |
| 6 | 73536 | Duncan | 63 | C | 10 (5 health) | — |
| 7 | 73533 | Duncan | 57 | C | 10 (5 health) | $137K |
Recommended Buyer Guides for Stephens County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 72.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Stephens County, Oklahoma
Overview
Stephens County in Oklahoma covers 7 ZIP codes with an average Home Safety Score of B (71/100).
6 of 7 ZIP codes have recorded EPA violations. 32 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.