Harmon County, Oklahoma
1 ZIP code · Avg score 65/100 · Grade C · Updated 2026-06-03
For most households in Harmon County, the 1 tracked ZIP code show adequate but uneven water quality.
How Harmon County Compares
How Harmon County Compares
Harmon County scores 14 points below the Oklahoma state average (79/100) and 3 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 16.1 (asthma 11.1%, diabetes 17%)
Estimated additional annual cost per homeowner: $2,370, driven primarily by flood
Infrastructure: 0.6% avg pipe failure probability, 100% of ZIPs at high risk
80% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Harmon County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 5 violations. Past 5 years: 15 total (15 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: $2,370
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
1,088 housing units in Harmon 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 Harmon County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
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 Harmon 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 Harmon County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Hollis | 2,264 | 29 |
| 2 | Harmon Water Corporation | 1,132 | 29 |
| 3 | Reed Water Corporation | 175 | 29 |
| 4 | Harmon Electric | 188 | 29 |
| 5 | Thirsty Water Corporation | 81 | 29 |
All ZIP Codes in Harmon County
1 ZIP code tracked in Harmon County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 73550 | Hollis | 65 | C | 29 (17 health) | $76K |
Recommended Buyer Guides for Harmon 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 — 80% 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
Overview
Harmon County in Oklahoma covers 1 ZIP code with an average Home Safety Score of C (65/100).
1 of 1 ZIP code have recorded EPA violations. 17 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.