Randolph County, Illinois
17 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-03
Tracking 17 ZIP codes in Randolph County reveals a mixed picture — tap water quality varies meaningfully by location.
How Randolph County Compares
How Randolph County Compares
Randolph County scores 5 points above the Illinois state average (61/100) and 2 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Randolph County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.2 (asthma 10.3%, diabetes 12.5%)
Estimated additional annual cost per homeowner: $1,086, driven primarily by flood
Infrastructure: 0.401% avg pipe failure probability, 59% of ZIPs at high risk
64.8% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Randolph County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 9 violations. Past 5 years: 19 total (19 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: $1,086
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
15,358 housing units in Randolph 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 Randolph County
Remediation costs are relatively manageable for most homeowners in Randolph 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 Randolph 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 Randolph County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Menard Correctional Center | 2,950 | 30 |
| 2 | Percy | 1,111 | 17 |
| 3 | Steeleville | 1,930 | 17 |
| 4 | TILDEN | 740 | 13 |
| 5 | Sparta | 4,395 | 9 |
14 total water systems serve Randolph County.
All ZIP Codes in Randolph County
17 ZIP codes tracked in Randolph County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 62217 | Baldwin | 83 | B | 1 | $138K |
| 2 | 62233 | Chester | 83 | B | 0 | $112K |
| 3 | 62292 | Tilden | 81 | B | 2 | $72K |
| 4 | 62286 | Sparta | 78 | B | 9 (2 health) | $149K |
| 5 | 62237 | Coulterville | 77 | B | 4 | $133K |
| 6 | 62241 | Ellis Grove | 74 | B | 3 | $136K |
| 7 | 62277 | Prairie Du Rocher | 69 | C | 2 (1 health) | $126K |
| 8 | 62278 | Red Bud | 69 | C | 5 (2 health) | $182K |
| 9 | 62272 | Percy | 67 | C | 4 | $104K |
| 10 | 62261 | Modoc | 63 | C | 0 | — |
| 11 | 62288 | Steeleville | 63 | C | 13 (5 health) | $167K |
| 12 | 62259 | Menard | 61 | C | 30 | — |
| 13 | 62242 | Evansville | 53 | D | 1 | $111K |
| 14 | 62268 | Oakdale | 53 | D | 0 | $130K |
| 15 | 62279 | Renault | 53 | D | 0 | $271K |
| 16 | 62297 | Walsh | 53 | D | 0 | $302K |
| 17 | 62244 | Fults | 50 | D | 0 | $207K |
Recommended Buyer Guides for Randolph County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 64.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Randolph County, Illinois
Overview
Randolph County in Illinois covers 17 ZIP codes with an average Home Safety Score of C (66/100).
11 of 17 ZIP codes have recorded EPA violations. 10 health-based violations 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.