DuPage County, Illinois
51 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
Water systems in DuPage County serve 51 ZIP codes with few reported safety events.
How DuPage County Compares
How DuPage County Compares
DuPage County scores 9 points above the Illinois state average (61/100) and 2 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: DuPage County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.7 (asthma 8.9%, diabetes 10%)
Estimated additional annual cost per homeowner: $2,031, driven primarily by flood
Infrastructure: 0.333% avg pipe failure probability, 12% of ZIPs at high risk
64.9% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across DuPage County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 4 violations. Past 5 years: 7 total (7 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: $2,031
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
372,469 housing units in DuPage 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 DuPage County
Remediation costs are relatively manageable for most homeowners in DuPage 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 DuPage 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 DuPage County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Villa Park | 22,263 | 33 |
| 2 | Downers Grove | 49,425 | 29 |
| 3 | Westmont | 24,161 | 26 |
| 4 | Hinsdale | 17,900 | 23 |
| 5 | Oak Brook | 9,400 | 22 |
74 total water systems serve DuPage County.
All ZIP Codes in DuPage County
51 ZIP codes tracked in DuPage County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 60105 | Bensenville | 83 | B | 1 | — |
| 2 | 60522 | Hinsdale | 83 | B | 1 | — |
| 3 | 60116 | Carol Stream | 81 | B | 2 | — |
| 4 | 60117 | Bloomingdale | 81 | B | 1 | — |
| 5 | 60128 | Carol Stream | 81 | B | 2 | — |
| 6 | 60132 | Carol Stream | 81 | B | 2 | — |
| 7 | 60138 | Glen Ellyn | 81 | B | 1 | — |
| 8 | 60186 | West Chicago | 81 | B | 2 | — |
| 9 | 60197 | Carol Stream | 81 | B | 2 | — |
| 10 | 60199 | Carol Stream | 81 | B | 2 | — |
| 11 | 60172 | Roselle | 77 | B | 2 | $323K |
| 12 | 60566 | Naperville | 77 | B | 1 | — |
| 13 | 60108 | Bloomingdale | 76 | B | 1 | $367K |
| 14 | 60185 | West Chicago | 76 | B | 2 | $314K |
| 15 | 60517 | Woodridge | 76 | B | 1 | $342K |
| 16 | 60514 | Clarendon Hills | 75 | B | 0 | $568K |
| 17 | 60561 | Darien | 75 | B | 4 | $389K |
| 18 | 60567 | Naperville | 75 | B | 1 | — |
| 19 | 60106 | Bensenville | 73 | B | 1 | $266K |
| 20 | 60143 | Itasca | 73 | B | 0 | $387K |
| 21 | 60187 | Wheaton | 73 | B | 1 | $432K |
| 22 | 60189 | Wheaton | 73 | B | 1 | $467K |
| 23 | 60190 | Winfield | 73 | B | 0 | $368K |
| 24 | 60515 | Downers Grove | 73 | B | 0 | $453K |
| 25 | 60516 | Downers Grove | 73 | B | 0 | $423K |
| 26 | 60521 | Hinsdale | 73 | B | 1 | $988K |
| 27 | 60555 | Warrenville | 72 | B | 2 | $272K |
| 28 | 60563 | Naperville | 72 | B | 1 | $423K |
| 29 | 60564 | Naperville | 72 | B | 1 | $550K |
| 30 | 60148 | Lombard | 71 | B | 1 | $329K |
| 31 | 60188 | Carol Stream | 71 | B | 2 | $312K |
| 32 | 60680 | Chicago | 71 | B | 19 (1 health) | — |
| 33 | 60139 | Glendale Heights | 70 | B | 1 | $249K |
| 34 | 60181 | Villa Park | 69 | C | 0 | $295K |
| 35 | 60399 | Wood Dale | 68 | C | 2 | — |
| 36 | 60540 | Naperville | 67 | C | 1 | $505K |
| 37 | 60565 | Naperville | 67 | C | 1 | $490K |
| 38 | 60137 | Glen Ellyn | 66 | C | 1 | $491K |
| 39 | 60532 | Lisle | 66 | C | 2 | $388K |
| 40 | 60126 | Elmhurst | 65 | C | 0 | $528K |
| 41 | 60101 | Addison | 64 | C | 15 (1 health) | $315K |
| 42 | 60559 | Westmont | 64 | C | 4 (1 health) | $356K |
| 43 | 60157 | Medinah | 63 | C | 0 | $513K |
| 44 | 60523 | Oak Brook | 60 | C | 17 | $733K |
| 45 | 60103 | Bartlett | 58 | C | 0 | $353K |
| 46 | 60191 | Wood Dale | 56 | C | 2 | $308K |
| 47 | 60599 | Fox Valley | 53 | D | 0 | — |
| 48 | 60118 | Dundee | 50 | D | 0 | $340K |
| 49 | 60439 | Lemont | 49 | D | 3 | $467K |
| 50 | 60569 | Aurora | 45 | D | 7 | — |
| 51 | 60598 | Aurora | 45 | D | 7 | — |
Recommended Buyer Guides for DuPage County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Water Filters for Lead — Lead above EPA action level in 4 ZIP codes
- Best Lead Paint Test Kits — 64.9% 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 DuPage County, Illinois
Overview
DuPage County in Illinois covers 51 ZIP codes with an average Home Safety Score of B (70/100).
40 of 51 ZIP codes have recorded EPA violations. 3 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.