Oregon County, Missouri
6 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
Homeowners across Oregon County's 6 ZIP codes live with water safety scores that generally beat state and national averages.
How Oregon County Compares
How Oregon County Compares
Oregon 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: Oregon County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17.3 (asthma 11.2%, diabetes 16.3%)
Estimated additional annual cost per homeowner: $615, driven primarily by wildfire
Infrastructure: 0.367% avg pipe failure probability, 33% of ZIPs at high risk
55.7% of homes built before 1978 (lead paint era)
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: $615
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,266 housing units in Oregon 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 Oregon County
Remediation costs are relatively manageable for most homeowners in Oregon 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 Oregon 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 Oregon County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | OREGON COUNTY PWSD 2 | 120 | 5 |
| 2 | Thayer Public Water System | 2,200 | 4 |
| 3 | Oregon County Pwsd 1 | 900 | 2 |
| 4 | Alton Public Water System | 1,000 | 2 |
| 5 | Koshkonong Public Water System | 212 | 1 |
All ZIP Codes in Oregon County
6 ZIP codes tracked in Oregon County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 65692 | Koshkonong | 83 | B | 1 | $175K |
| 2 | 65606 | Alton | 82 | B | 2 | $130K |
| 3 | 65778 | Myrtle | 82 | B | 5 (1 health) | $143K |
| 4 | 65791 | Thayer | 80 | B | 3 | $110K |
| 5 | 63942 | Gatewood | 53 | D | 0 | $121K |
| 6 | 65690 | Couch | 53 | D | 0 | — |
Recommended Buyer Guides for Oregon County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 55.7% of homes built before 1978
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Oregon County, Missouri
Overview
Oregon County in Missouri covers 6 ZIP codes with an average Home Safety Score of B (72/100).
4 of 6 ZIP codes have recorded EPA violations. 1 health-based violation 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.