Grant County, Oklahoma
8 ZIP codes · Avg score 85/100 · Grade A · Updated 2026-06-03
Water utilities serving Grant County's 8 ZIP codes have built a consistent compliance record — the county's above-average grade reflects years of data showing low violation rates and no systemic health concerns.
How Grant County Compares
How Grant County Compares
Grant County scores 6 points above the Oklahoma state average (79/100) and 17 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Grant County, Oklahoma
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.1 (asthma 11.1%, diabetes 13.6%)
Estimated additional annual cost per homeowner: $658, driven primarily by water_lead
Infrastructure: 0.51% avg pipe failure probability, 100% of ZIPs at high risk
83.5% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Grant County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 25 violations. Past 5 years: 40 total (40 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: $658
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,340 housing units in Grant 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 Grant County
Remediation costs are relatively manageable for most homeowners in Grant 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 Grant 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 Grant County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Tonkawa | 3,299 | 96 |
| 2 | Lamont | 417 | 96 |
| 3 | Deer Creek | 147 | 31 |
| 4 | Sw Water Inc. | 200 | 29 |
| 5 | Manchester | 104 | 22 |
13 total water systems serve Grant County.
All ZIP Codes in Grant County
8 ZIP codes tracked in Grant County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 73758 | Manchester | 94 | A | 22 (1 health) | $68K |
| 2 | 73761 | Nash | 94 | A | 8 | $127K |
| 3 | 73771 | Wakita | 94 | A | 9 (1 health) | — |
| 4 | 73759 | Medford | 90 | A | 6 (2 health) | $66K |
| 5 | 73766 | Pond Creek | 89 | A | 6 (2 health) | $116K |
| 6 | 74643 | Lamont | 87 | A | 96 (1 health) | $65K |
| 7 | 74636 | Deer Creek | 66 | C | 31 (14 health) | $124K |
| 8 | 74646 | Nardin | 66 | C | 0 | — |
Recommended Buyer Guides for Grant County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 83.5% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Grant County, Oklahoma
Overview
Grant County in Oklahoma covers 8 ZIP codes with an average Home Safety Score of A (85/100).
7 of 8 ZIP codes have recorded EPA violations. 21 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.