Kay County, Oklahoma
8 ZIP codes · Avg score 83/100 · Grade B · Updated 2026-06-03
Throughout Kay County, the 8 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 Kay County Compares
How Kay County Compares
Kay County scores 4 points above the Oklahoma state average (79/100) and 15 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Kay 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 11.8%, diabetes 14.1%)
Estimated additional annual cost per homeowner: $1,826, driven primarily by flood
Infrastructure: 0.486% avg pipe failure probability, 63% of ZIPs at high risk
76.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Kay County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 23 violations. Past 5 years: 77 total (77 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: $1,826
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
22,031 housing units in Kay 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 Kay County
Remediation costs are relatively manageable for most homeowners in Kay 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 Kay 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 Kay County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Kay Company Rwd #1 | 1,765 | 48 |
| 2 | Kay Company Rwd #3 | 1,000 | 48 |
| 3 | Kay Company Rwd #5 (dale Water Corporation) | 765 | 44 |
| 4 | Osage Company Rwd #21 | 1,500 | 36 |
| 5 | Kay County Rural Water District 7 | 920 | 34 |
16 total water systems serve Kay County.
All ZIP Codes in Kay County
8 ZIP codes tracked in Kay County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 74641 | Kaw City | 97 | A | 2 | $132K |
| 2 | 74602 | Ponca City | 94 | A | 6 (1 health) | — |
| 3 | 74604 | Ponca City | 86 | A | 6 (1 health) | $198K |
| 4 | 74653 | Tonkawa | 86 | A | 4 (1 health) | $86K |
| 5 | 74647 | Newkirk | 83 | B | 30 (10 health) | $110K |
| 6 | 74601 | Ponca City | 81 | B | 6 (1 health) | $95K |
| 7 | 74632 | Braman | 80 | B | 7 (4 health) | — |
| 8 | 74631 | Blackwell | 55 | C | 17 (13 health) | $77K |
Recommended Buyer Guides for Kay 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 — 76.6% 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 Kay County, Oklahoma
Overview
Kay County in Oklahoma covers 8 ZIP codes with an average Home Safety Score of B (83/100).
8 of 8 ZIP codes have recorded EPA violations. 31 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.