Rock County, Minnesota
8 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
Within Rock County, 8 tracked ZIP codes reveal moderate water quality — national standards are generally met, with some documented exceptions.
How Rock County Compares
How Rock County Compares
Rock County scores 3 points below the Minnesota state average (62/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Rock County, Minnesota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.2 (asthma 10%, diabetes 11.4%)
Estimated additional annual cost per homeowner: $1,195, driven primarily by energy_code_gap
Infrastructure: 0.464% avg pipe failure probability, 100% of ZIPs at high risk
80.8% 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: $1,195
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,014 housing units in Rock 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 Rock County
Remediation costs are relatively manageable for most homeowners in Rock 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 Rock 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 Rock County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Rock County Rural Water System | 2,919 | 4 |
| 2 | Steen | 180 | 3 |
| 3 | Hardwick | 198 | 1 |
| 4 | Beaver Creek | 297 | 0 |
| 5 | Hills | 685 | 0 |
9 total water systems serve Rock County.
All ZIP Codes in Rock County
8 ZIP codes tracked in Rock County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 56116 | Beaver Creek | 66 | C | 0 | $220K |
| 2 | 56134 | Hardwick | 66 | C | 1 | $198K |
| 3 | 56138 | Hills | 66 | C | 0 | $198K |
| 4 | 56147 | Kenneth | 66 | C | 0 | $120K |
| 5 | 56156 | Luverne | 65 | C | 0 | $201K |
| 6 | 56158 | Magnolia | 55 | C | 0 | $109K |
| 7 | 56173 | Steen | 51 | D | 3 | $166K |
| 8 | 56146 | Kanaranzi | 40 | D | 0 | — |
Recommended Buyer Guides for Rock County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 80.8% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Rock County, Minnesota
Overview
Rock County in Minnesota covers 8 ZIP codes with an average Home Safety Score of C (59/100).
2 of 8 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.