Ogle County, Illinois
16 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
Ogle County shows moderate water quality across its 16 ZIP codes — some areas carry violations worth monitoring.
How Ogle County Compares
How Ogle County Compares
Ogle County scores 6 points below the Illinois state average (61/100) and 13 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Ogle County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.8 (asthma 10.1%, diabetes 12.2%)
Estimated additional annual cost per homeowner: $1,461, driven primarily by energy_code_gap
Infrastructure: 0.418% avg pipe failure probability, 63% of ZIPs at high risk
71.8% 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: $1,461
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
21,993 housing units in Ogle 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 Ogle County
Remediation costs are relatively manageable for most homeowners in Ogle 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 Ogle 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 Ogle County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Byron | 4,743 | 9 |
| 2 | Davis Junction | 2,344 | 9 |
| 3 | Stillman Valley | 1,200 | 9 |
| 4 | Mount Morris | 2,861 | 8 |
| 5 | Polo | 2,355 | 7 |
18 total water systems serve Ogle County.
All ZIP Codes in Ogle County
16 ZIP codes tracked in Ogle County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 61084 | Stillman Valley | 70 | B | 0 | $204K |
| 2 | 61020 | Davis Junction | 68 | C | 2 | $195K |
| 3 | 61049 | Lindenwood | 68 | C | 1 | $183K |
| 4 | 61054 | Mount Morris | 68 | C | 1 | $119K |
| 5 | 61030 | Forreston | 66 | C | 0 | $148K |
| 6 | 60113 | Creston | 63 | C | 3 | $180K |
| 7 | 61064 | Polo | 61 | C | 2 | $161K |
| 8 | 61061 | Oregon | 56 | C | 5 (1 health) | $203K |
| 9 | 61010 | Byron | 55 | C | 2 | $218K |
| 10 | 61068 | Rochelle | 54 | D | 7 | $165K |
| 11 | 61047 | Leaf River | 53 | D | 2 | $223K |
| 12 | 61052 | Monroe Center | 42 | D | 0 | $212K |
| 13 | 60129 | Esmond | 40 | D | 0 | $177K |
| 14 | 61007 | Baileyville | 40 | D | 0 | — |
| 15 | 61015 | Chana | 40 | D | 0 | $209K |
| 16 | 61043 | Holcomb | 40 | D | 0 | $123K |
Recommended Buyer Guides for Ogle County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Lead Paint Test Kits — 71.8% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Ogle County, Illinois
Overview
Ogle County in Illinois covers 16 ZIP codes with an average Home Safety Score of C (55/100).
9 of 16 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.