Alexander County, Illinois
8 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-03
Alexander County maintains reliable drinking water quality across all 8 of its tracked ZIP codes.
How Alexander County Compares
How Alexander County Compares
Alexander County scores 12 points above the Illinois state average (61/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Alexander County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17.2 (asthma 11.5%, diabetes 18.1%)
Estimated additional annual cost per homeowner: $1,803, driven primarily by flood
Infrastructure: 0.394% avg pipe failure probability, 57% of ZIPs at high risk
70.7% 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: $1,803
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,462 housing units in Alexander 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 Alexander County
Remediation costs are relatively manageable for most homeowners in Alexander 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 Alexander 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 Alexander County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Southwater Inc. | 2,185 | 5 |
| 2 | CENTRAL ALEXANDER CNTY PWD | 1,763 | 3 |
| 3 | Tamms | 653 | 3 |
| 4 | THEBES | 213 | 2 |
| 5 | Il American-alton | 46,127 | 0 |
8 total water systems serve Alexander County.
All ZIP Codes in Alexander County
8 ZIP codes tracked in Alexander County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 62914 | Cairo | 85 | A | 0 | $29K |
| 2 | 62990 | Thebes | 84 | B | 2 | $123K |
| 3 | 62988 | Tamms | 79 | B | 3 | $69K |
| 4 | 62969 | Olive Branch | 78 | B | 3 | $82K |
| 5 | 62993 | Unity | 73 | B | 0 | — |
| 6 | 62962 | Miller City | 65 | C | 0 | — |
| 7 | 62028 | Elsah | 60 | C | 0 | $168K |
| 8 | 62957 | Mc Clure | 60 | C | 0 | $58K |
Recommended Buyer Guides for Alexander County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 70.7% of homes built before 1978
- 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 Alexander County, Illinois
Overview
Alexander County in Illinois covers 8 ZIP codes with an average Home Safety Score of B (73/100).
3 of 8 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.