Marshall County, Illinois
9 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-03
Monitoring figures for Marshall County indicate average water quality overall — some ZIP codes among the 9 tracked have recorded health-based violations, while others operate cleanly, making individual ZIP-level data the most actionable reference point.
How Marshall County Compares
How Marshall County Compares
Marshall County scores 0 points above the Illinois state average (61/100) and 7 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Marshall County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.4 (asthma 10.3%, diabetes 12.9%)
Estimated additional annual cost per homeowner: $1,360, driven primarily by flood
Infrastructure: 0.418% avg pipe failure probability, 67% of ZIPs at high risk
75.9% 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: $1,360
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
5,423 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 | Lacon | 1,878 | 3 |
| 2 | Varna | 342 | 3 |
| 3 | Camp Grove | 146 | 1 |
| 4 | Henry | 2,230 | 1 |
| 5 | Toluca | 1,348 | 0 |
7 total water systems serve Marshall County.
All ZIP Codes in Marshall County
9 ZIP codes tracked in Marshall County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 61369 | Toluca | 70 | B | 0 | $115K |
| 2 | 61540 | Lacon | 70 | B | 0 | $154K |
| 3 | 61375 | Varna | 66 | C | 3 (1 health) | $163K |
| 4 | 61424 | Camp Grove | 66 | C | 1 | — |
| 5 | 61541 | La Rose | 66 | C | 0 | $72K |
| 6 | 61565 | Sparland | 65 | C | 0 | $162K |
| 7 | 61537 | Henry | 63 | C | 1 | $121K |
| 8 | 61479 | Speer | 40 | D | 0 | $207K |
| 9 | 61560 | Putnam | 40 | D | 0 | $230K |
Recommended Buyer Guides for Marshall County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 75.9% 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 Marshall County, Illinois
Overview
Marshall County in Illinois covers 9 ZIP codes with an average Home Safety Score of C (61/100).
3 of 9 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← Back to Illinois 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.