Marshall County, Kansas
12 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-03
Covering 12 ZIP codes, Marshall County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How Marshall County Compares
How Marshall County Compares
Marshall County scores 7 points below the Kansas state average (64/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Marshall County, Kansas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.6 (asthma 10.2%, diabetes 12.9%)
Estimated additional annual cost per homeowner: $673, driven primarily by water_lead
Infrastructure: 0.442% avg pipe failure probability, 75% of ZIPs at high risk
75.3% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Marshall County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 2 violations. Past 5 years: 4 total (4 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: $673
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
5,034 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 | Marshall Company Rwd 1 | 160 | 19 |
| 2 | Washington Company Rwd 1 | 1,093 | 9 |
| 3 | City of Oketo, | 65 | 5 |
| 4 | City of Waterville, | 656 | 5 |
| 5 | Marshall Company Rwd 3 | 1,228 | 3 |
14 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 | 66406 | Beattie | 66 | C | 0 | $136K |
| 2 | 66403 | Axtell | 65 | C | 0 | $258K |
| 3 | 66411 | Blue Rapids | 65 | C | 2 | $76K |
| 4 | 66541 | Summerfield | 65 | C | 3 | $85K |
| 5 | 66544 | Vermillion | 64 | C | 1 | $76K |
| 6 | 66508 | Marysville | 63 | C | 2 | $129K |
| 7 | 66548 | Waterville | 62 | C | 5 (3 health) | $101K |
| 8 | 66518 | Oketo | 61 | C | 5 (1 health) | $128K |
| 9 | 66427 | Frankfort | 51 | D | 0 | $101K |
| 10 | 66438 | Home | 45 | D | 19 (1 health) | $296K |
| 11 | 66404 | Baileyville | 40 | D | 0 | $226K |
| 12 | 66412 | Bremen | 40 | D | 0 | $331K |
Recommended Buyer Guides for Marshall County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 75.3% 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
Deep Dive Reports
Detailed analysis for Marshall County, Kansas
Overview
Marshall County in Kansas covers 12 ZIP codes with an average Home Safety Score of C (57/100).
7 of 12 ZIP codes have recorded EPA violations. 5 health-based violations have been documented.
← Back to Kansas 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.