Clay County, Illinois
6 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
Tracking 6 ZIP codes in Clay County shows a water safety record well above the national median — violations are isolated exceptions, not recurring patterns.
How Clay County Compares
How Clay County Compares
Clay County scores 9 points above the Illinois state average (61/100) and 2 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Clay County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.4 (asthma 10.8%, diabetes 13.9%)
Estimated additional annual cost per homeowner: $683, driven primarily by energy_code_gap
Infrastructure: 0.378% avg pipe failure probability, 17% of ZIPs at high risk
62.2% 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: $683
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,403 housing units in Clay 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 Clay County
Remediation costs are relatively manageable for most homeowners in Clay 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 Clay 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 Clay County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Ej Water Cooperative | 29,720 | 10 |
| 2 | Clay City | 957 | 8 |
| 3 | Xenia | 542 | 3 |
| 4 | Flora | 5,233 | 2 |
| 5 | Clay County Water Inc. | 2,015 | 2 |
8 total water systems serve Clay County.
All ZIP Codes in Clay County
6 ZIP codes tracked in Clay County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 62858 | Louisville | 82 | B | 2 | $107K |
| 2 | 62839 | Flora | 75 | B | 2 | $91K |
| 3 | 62426 | Edgewood | 72 | B | 0 | $75K |
| 4 | 62899 | Xenia | 71 | B | 3 | $136K |
| 5 | 62824 | Clay City | 69 | C | 3 | $84K |
| 6 | 62879 | Sailor Springs | 53 | D | 0 | — |
Recommended Buyer Guides for Clay County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance — guides surface only when county data warrants them.
- Best Lead Paint Test Kits — 62.2% of homes built before 1978
Deep Dive Reports
Detailed analysis for Clay County, Illinois
Overview
Clay County in Illinois covers 6 ZIP codes with an average Home Safety Score of B (70/100).
4 of 6 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.