Harrison County, Missouri
8 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
The 8 water systems serving Harrison County show strong compliance with federal drinking water standards.
How Harrison County Compares
How Harrison County Compares
Harrison County scores 3 points above the Missouri state average (69/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Harrison County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 16.1 (asthma 10.7%, diabetes 14.7%)
Estimated additional annual cost per homeowner: $393, driven primarily by energy_code_gap
Infrastructure: 0.401% avg pipe failure probability, 38% of ZIPs at high risk
64.6% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Harrison County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 8 violations. Past 5 years: 13 total (13 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: $393
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,879 housing units in Harrison 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 Harrison County
Remediation costs are relatively manageable for most homeowners in Harrison 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 Harrison 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 Harrison County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Harrison County Pwsd 2 | 3,740 | 17 |
| 2 | Bethany Public Water System | 3,292 | 8 |
| 3 | Grundy County Pwsd 1 | 3,900 | 5 |
| 4 | Daviess County Pwsd 2 | 2,448 | 5 |
| 5 | Gilman City Public Water System | 387 | 5 |
8 total water systems serve Harrison County.
All ZIP Codes in Harrison County
8 ZIP codes tracked in Harrison County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 64481 | Ridgeway | 83 | B | 0 | $104K |
| 2 | 64424 | Bethany | 82 | B | 8 (1 health) | $120K |
| 3 | 64442 | Eagleville | 82 | B | 2 | $119K |
| 4 | 64471 | New Hampton | 82 | B | 2 (1 health) | $75K |
| 5 | 64642 | Gilman City | 79 | B | 5 (3 health) | $88K |
| 6 | 64426 | Blythedale | 63 | C | 0 | $28K |
| 7 | 64458 | Hatfield | 53 | D | 0 | — |
| 8 | 64467 | Martinsville | 53 | D | 0 | $238K |
Recommended Buyer Guides for Harrison 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 — 64.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Harrison County, Missouri
Overview
Harrison County in Missouri covers 8 ZIP codes with an average Home Safety Score of B (72/100).
4 of 8 ZIP codes have recorded EPA violations. 5 health-based violations have been documented.
← Back to Missouri 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.