Rock Island County, Illinois
21 ZIP codes · Avg score 54/100 · Grade D · Updated 2026-06-03
Unlike better-scoring counties, Rock Island County records health-based violations across a meaningful portion of its 21 ZIP codes — the overall safety grade is well below average.
How Rock Island County Compares
How Rock Island County Compares
Rock Island County scores 7 points below the Illinois state average (61/100) and 14 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Rock Island County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.9 (asthma 10.5%, diabetes 13.1%)
Estimated additional annual cost per homeowner: $1,985, driven primarily by flood
Infrastructure: 0.443% avg pipe failure probability, 60% of ZIPs at high risk
72.4% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Rock Island County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 18 violations. Past 5 years: 26 total (26 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $1,985
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
68,089 housing units in Rock Island 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 Rock Island County
Remediation costs are relatively manageable for most homeowners in Rock Island 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 Rock Island 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 Rock Island County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | East Moline | 21,374 | 60 |
| 2 | CARBON CLIFF | 2,134 | 56 |
| 3 | Silvis | 7,473 | 56 |
| 4 | Silvis Heights Water Corporation | 1,450 | 45 |
| 5 | Moline | 44,500 | 25 |
40 total water systems serve Rock Island County.
All ZIP Codes in Rock Island County
21 ZIP codes tracked in Rock Island County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 61266 | Moline | 69 | C | 2 | — |
| 2 | 61272 | New Boston | 68 | C | 1 | $131K |
| 3 | 61232 | Andalusia | 65 | C | 0 | $175K |
| 4 | 61256 | Hampton | 62 | C | 4 | $183K |
| 5 | 61275 | Port Byron | 61 | C | 9 (1 health) | $236K |
| 6 | 61284 | Taylor Ridge | 61 | C | 3 | $223K |
| 7 | 61259 | Illinois City | 60 | C | 5 | $199K |
| 8 | 61278 | Rapids City | 60 | C | 2 | $223K |
| 9 | 61235 | Atkinson | 59 | C | 4 (1 health) | $132K |
| 10 | 61239 | Carbon Cliff | 59 | C | 9 (1 health) | $103K |
| 11 | 61299 | Rock Island | 58 | C | 5 | — |
| 12 | 61265 | Moline | 54 | D | 2 | $142K |
| 13 | 61201 | Rock Island | 53 | D | 5 | $118K |
| 14 | 61242 | Cordova | 53 | D | 8 (1 health) | $219K |
| 15 | 61264 | Milan | 53 | D | 7 | $148K |
| 16 | 61240 | Coal Valley | 48 | D | 12 | $231K |
| 17 | 61282 | Silvis | 47 | D | 36 (5 health) | $159K |
| 18 | 61236 | Barstow | 45 | D | 0 | $119K |
| 19 | 61237 | Buffalo Prairie | 40 | D | 0 | — |
| 20 | 61257 | Hillsdale | 40 | D | 0 | $116K |
| 21 | 61244 | East Moline | 26 | F | 9 (1 health) | $141K |
Recommended Buyer Guides for Rock Island 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 — 72.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Rock Island County, Illinois
Overview
Rock Island County in Illinois covers 21 ZIP codes with an average Home Safety Score of D (54/100).
17 of 21 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.
What You Can Do
Rock Island County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
72.4% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.