Delaware County, Oklahoma
10 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
Monitoring figures for Delaware County indicate average water quality overall — some ZIP codes among the 10 tracked have recorded health-based violations, while others operate cleanly, making individual ZIP-level data the most actionable reference point.
How Delaware County Compares
How Delaware County Compares
Delaware County scores 17 points below the Oklahoma state average (79/100) and 6 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Delaware County, Oklahoma
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 16.8 (asthma 12.2%, diabetes 16.5%)
Estimated additional annual cost per homeowner: $1,064, driven primarily by flood
Infrastructure: 0.38% avg pipe failure probability, 40% of ZIPs at high risk
53.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Delaware County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 51 violations. Past 5 years: 81 total (81 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: $1,064
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
24,838 housing units in Delaware 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 Delaware County
Remediation costs are relatively manageable for most homeowners in Delaware 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 Delaware 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 Delaware County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Hickory Meadows | 157 | 149 |
| 2 | Holiday Shores Prop Assn | 136 | 149 |
| 3 | Grove Municipal Services Authority | 7,311 | 135 |
| 4 | Seneca-cayuga Nation | 400 | 116 |
| 5 | Lakewood Village | 293 | 116 |
32 total water systems serve Delaware County.
All ZIP Codes in Delaware County
10 ZIP codes tracked in Delaware County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 74342 | Eucha | 74 | B | 2 | $128K |
| 2 | 74338 | Colcord | 68 | C | 26 (2 health) | $117K |
| 3 | 74368 | Twin Oaks | 67 | C | 10 (1 health) | — |
| 4 | 74347 | Kansas | 64 | C | 18 (5 health) | $94K |
| 5 | 74364 | Rose | 63 | C | 0 | $152K |
| 6 | 74345 | Grove | 62 | C | 58 (3 health) | — |
| 7 | 74344 | Grove | 61 | C | 58 (3 health) | $207K |
| 8 | 74346 | Jay | 58 | C | 19 (11 health) | $125K |
| 9 | 74331 | Afton | 53 | D | 33 (8 health) | $180K |
| 10 | 74359 | Oaks | 53 | D | 0 | $68K |
Recommended Buyer Guides for Delaware County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 53.8% 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 Delaware County, Oklahoma
Overview
Delaware County in Oklahoma covers 10 ZIP codes with an average Home Safety Score of C (62/100).
8 of 10 ZIP codes have recorded EPA violations. 33 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.