Cass County, Illinois
9 ZIP codes · Avg score 53/100 · Grade D · Updated 2026-06-03
Across Cass County's 9 ZIP codes, EPA data shows a below-average compliance pattern — health-based violations are documented in several areas, and independent testing is a reasonable step for concerned households.
How Cass County Compares
How Cass County Compares
Cass County scores 8 points below the Illinois state average (61/100) and 15 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Cass 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 13.4%)
Estimated additional annual cost per homeowner: $1,612, driven primarily by flood
Infrastructure: 0.445% avg pipe failure probability, 75% of ZIPs at high risk
75.8% 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: $1,612
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,350 housing units in Cass 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 Cass County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
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 Cass 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 Cass County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Ashland | 1,333 | 3 |
| 2 | CHANDLERVILLE | 838 | 3 |
| 3 | Arenzville Rural Water Cooperative | 675 | 2 |
| 4 | Arenzville | 419 | 2 |
| 5 | Cass Rural Water District | 403 | 2 |
7 total water systems serve Cass County.
All ZIP Codes in Cass County
9 ZIP codes tracked in Cass County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 62612 | Ashland | 69 | C | 3 | $113K |
| 2 | 62611 | Arenzville | 68 | C | 2 | $159K |
| 3 | 62691 | Virginia | 62 | C | 1 | $108K |
| 4 | 62618 | Beardstown | 58 | C | 1 | $86K |
| 5 | 62627 | Chandlerville | 53 | D | 3 (1 health) | $79K |
| 6 | 62639 | Frederick | 53 | D | 0 | $64K |
| 7 | 62622 | Bluff Springs | 40 | D | 0 | — |
| 8 | 62660 | Literberry | 40 | D | 0 | — |
| 9 | 62617 | Bath | 35 | F | 0 | $79K |
Recommended Buyer Guides for Cass 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 — 75.8% 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 Cass County, Illinois
Overview
Cass County in Illinois covers 9 ZIP codes with an average Home Safety Score of D (53/100).
5 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.
What You Can Do
Cass County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
75.8% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.