Kendall County, Illinois
7 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Safe water is the norm for most of Kendall County's 7 ZIP codes — but a notable subset have documented violations that push the grade to the middle tier.
How Kendall County Compares
How Kendall County Compares
Kendall County scores 3 points below the Illinois state average (61/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Kendall County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.2 (asthma 9.5%, diabetes 9.4%)
Estimated additional annual cost per homeowner: $2,017, driven primarily by flood
Infrastructure: 0.366% avg pipe failure probability, 29% of ZIPs at high risk
55.9% 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: $2,017
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
30,817 housing units in Kendall 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 Kendall County
Remediation costs are relatively manageable for most homeowners in Kendall 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 Kendall 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 Kendall County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Yorkville | 23,000 | 16 |
| 2 | Storybook Highlands | 100 | 12 |
| 3 | Oswego | 38,169 | 12 |
| 4 | Montgomery | 28,956 | 12 |
| 5 | Joliet | 160,000 | 7 |
13 total water systems serve Kendall County.
All ZIP Codes in Kendall County
7 ZIP codes tracked in Kendall County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 60541 | Newark | 65 | C | 0 | $303K |
| 2 | 60543 | Oswego | 64 | C | 2 | $319K |
| 3 | 60512 | Bristol | 61 | C | 5 (1 health) | $281K |
| 4 | 60560 | Yorkville | 61 | C | 5 | $325K |
| 5 | 60545 | Plano | 54 | D | 4 | $236K |
| 6 | 60536 | Millbrook | 53 | D | 0 | $200K |
| 7 | 60537 | Millington | 45 | D | 0 | $205K |
Recommended Buyer Guides for Kendall County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 55.9% 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 Kendall County, Illinois
Overview
Kendall County in Illinois covers 7 ZIP codes with an average Home Safety Score of C (58/100).
4 of 7 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.