Olmsted County, Minnesota
12 ZIP codes · Avg score 60/100 · Grade C · Updated 2026-06-03
Based on current EPA data, Olmsted County's 12 ZIP codes reflect fair but mixed water safety.
How Olmsted County Compares
How Olmsted County Compares
Olmsted County scores 2 points below the Minnesota state average (62/100) and 8 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Olmsted County, Minnesota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.5 (asthma 9.8%, diabetes 9.5%)
Estimated additional annual cost per homeowner: $1,460, driven primarily by flood
Infrastructure: 0.333% avg pipe failure probability, 17% of ZIPs at high risk
50.8% 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: $1,460
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
69,730 housing units in Olmsted 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 Olmsted County
Remediation costs are relatively manageable for most homeowners in Olmsted 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 Olmsted 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 Olmsted County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Rochester | 123,624 | 19 |
| 2 | Chester Heights | 300 | 18 |
| 3 | Zumbro Ridge Estates | 270 | 18 |
| 4 | Hallmark Terrace Mobile Home Park | 170 | 18 |
| 5 | Sandy Slopes Community | 158 | 18 |
12 total water systems serve Olmsted County.
All ZIP Codes in Olmsted County
12 ZIP codes tracked in Olmsted County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 55920 | Byron | 70 | B | 0 | $357K |
| 2 | 55929 | Dover | 70 | B | 0 | $300K |
| 3 | 55934 | Eyota | 70 | B | 0 | $301K |
| 4 | 55976 | Stewartville | 70 | B | 0 | $278K |
| 5 | 55960 | Oronoco | 65 | C | 1 | $440K |
| 6 | 55903 | Rochester | 64 | C | 3 | — |
| 7 | 55905 | Rochester | 58 | C | 3 | — |
| 8 | 55901 | Rochester | 54 | D | 3 | $290K |
| 9 | 55902 | Rochester | 54 | D | 3 | $430K |
| 10 | 55906 | Rochester | 54 | D | 3 | $350K |
| 11 | 55904 | Rochester | 49 | D | 3 | $237K |
| 12 | 55972 | Saint Charles | 45 | D | 0 | $256K |
Recommended Buyer Guides for Olmsted County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 50.8% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- 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 Olmsted County, Minnesota
Overview
Olmsted County in Minnesota covers 12 ZIP codes with an average Home Safety Score of C (60/100).
7 of 12 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Minnesota 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.