Will County, Illinois
27 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-03
Although much of Will County meets baseline standards, some of its 27 ZIP codes show violations that merit closer attention.
How Will County Compares
How Will County Compares
Will 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: Will County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 9.7%, diabetes 10.7%)
Estimated additional annual cost per homeowner: $2,020, driven primarily by flood
Infrastructure: 0.346% avg pipe failure probability, 19% of ZIPs at high risk
41.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Will County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 51 violations. Past 5 years: 84 total (84 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: $2,020
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
218,527 housing units in Will 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 Will County
Remediation costs are relatively manageable for most homeowners in Will 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 Will 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 Will County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Joliet | 160,000 | 362 |
| 2 | Stateville Correctional Center | 992 | 328 |
| 3 | Crystal Lawns Addition Improvement Assoc | 1,435 | 320 |
| 4 | East Moreland Wtr Service Assn | 1,320 | 317 |
| 5 | Southeast Joliet Sd | 2,000 | 309 |
54 total water systems serve Will County.
All ZIP Codes in Will County
27 ZIP codes tracked in Will County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 60446 | Romeoville | 83 | B | 0 | $245K |
| 2 | 60490 | Bolingbrook | 83 | B | 0 | $379K |
| 3 | 60401 | Beecher | 80 | B | 3 | $239K |
| 4 | 60408 | Braidwood | 80 | B | 3 | $220K |
| 5 | 60449 | Monee | 79 | B | 5 | $270K |
| 6 | 60442 | Manhattan | 78 | B | 0 | $340K |
| 7 | 60585 | Plainfield | 77 | B | 7 (3 health) | $416K |
| 8 | 60417 | Crete | 75 | B | 3 | $226K |
| 9 | 60423 | Frankfort | 74 | B | 5 (1 health) | $377K |
| 10 | 60440 | Bolingbrook | 73 | B | 0 | $262K |
| 11 | 60403 | Crest Hill | 72 | B | 22 (3 health) | $223K |
| 12 | 60421 | Elwood | 72 | B | 3 | $251K |
| 13 | 60404 | Shorewood | 71 | B | 4 | $320K |
| 14 | 60441 | Lockport | 70 | B | 3 | $287K |
| 15 | 60451 | New Lenox | 69 | C | 11 (1 health) | $373K |
| 16 | 60448 | Mokena | 67 | C | 4 | $370K |
| 17 | 60544 | Plainfield | 67 | C | 7 (3 health) | $312K |
| 18 | 60586 | Plainfield | 67 | C | 7 (3 health) | $298K |
| 19 | 60434 | Joliet | 59 | C | 51 (7 health) | — |
| 20 | 60481 | Wilmington | 54 | D | 19 | $225K |
| 21 | 60503 | Aurora | 53 | D | 7 | $311K |
| 22 | 60410 | Channahon | 52 | D | 2 | $294K |
| 23 | 60431 | Joliet | 49 | D | 51 (7 health) | $275K |
| 24 | 60435 | Joliet | 49 | D | 51 (7 health) | $217K |
| 25 | 60436 | Joliet | 49 | D | 51 (7 health) | $171K |
| 26 | 60432 | Joliet | 44 | D | 51 (7 health) | $185K |
| 27 | 60433 | Joliet | 44 | D | 51 (7 health) | $168K |
Recommended Buyer Guides for Will 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 2 ZIP codes
- 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 Will County, Illinois
Overview
Will County in Illinois covers 27 ZIP codes with an average Home Safety Score of C (66/100).
23 of 27 ZIP codes have recorded EPA violations. 56 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.