Marshall County, Minnesota
12 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
While Marshall County avoids the worst tiers, a portion of its 12 ZIP codes have logged violations.
How Marshall County Compares
How Marshall County Compares
Marshall County scores 7 points below the Minnesota state average (62/100) and 13 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Marshall County, Minnesota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.8 (asthma 9.9%, diabetes 12.1%)
Estimated additional annual cost per homeowner: $2,262, driven primarily by flood
Infrastructure: 0.425% avg pipe failure probability, 75% of ZIPs at high risk
74.3% 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: $2,262
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,814 housing units in Marshall 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 Marshall County
Remediation costs are relatively manageable for most homeowners in Marshall 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 Marshall 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 Marshall County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Strandquist | 63 | 2 |
| 2 | Middle River | 299 | 1 |
| 3 | Marshall-Polk Rural Water System | 3,295 | 0 |
| 4 | Alvarado | 377 | 0 |
| 5 | Argyle | 533 | 0 |
12 total water systems serve Marshall County.
All ZIP Codes in Marshall County
12 ZIP codes tracked in Marshall County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 56738 | Newfolden | 70 | B | 0 | $180K |
| 2 | 56758 | Strandquist | 69 | C | 2 (1 health) | $110K |
| 3 | 56737 | Middle River | 68 | C | 1 | $125K |
| 4 | 56710 | Alvarado | 65 | C | 0 | $130K |
| 5 | 56760 | Viking | 59 | C | 0 | $197K |
| 6 | 56713 | Argyle | 57 | C | 0 | $193K |
| 7 | 56762 | Warren | 55 | C | 0 | $149K |
| 8 | 56757 | Stephen | 52 | D | 0 | $114K |
| 9 | 56744 | Oslo | 47 | D | 0 | $135K |
| 10 | 56724 | Gatzke | 40 | D | 0 | $98K |
| 11 | 56759 | Strathcona | 40 | D | 0 | $195K |
| 12 | 56727 | Grygla | 33 | F | 0 | $167K |
Recommended Buyer Guides for Marshall County
Methodologically, the recommendation order reflects severity in the federal record: contaminants flagged in EPA detection records for this county outrank generic water concerns, FEMA-confirmed hazard ratings shift emergency-related categories upward, and CDC lead-exposure markers govern when lead-test kits and certified filters appear at the top of the list.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 74.3% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
Deep Dive Reports
Detailed analysis for Marshall County, Minnesota
Overview
Marshall County in Minnesota covers 12 ZIP codes with an average Home Safety Score of C (55/100).
2 of 12 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← 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.