Illinois — 1st District
119th Congress · 25 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-03-22
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-03-22
Top Contaminants
ZIP Codes in This District
25 ZIP codes tracked in Illinois's 1st District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 60408 | Braidwood | 83 | B | 0 |
| 2 | 60423 | Frankfort | 78 | B | 0 |
| 3 | 60442 | Manhattan | 78 | B | 0 |
| 4 | 60950 | Manteno | 74 | B | 2 |
| 5 | 60445 | Midlothian | 73 | B | 1 |
| 6 | 60451 | New Lenox | 69 | C | 25 (1 health) |
| 7 | 60452 | Oak Forest | 69 | C | 2 |
| 8 | 60469 | Posen | 69 | C | 2 |
| 9 | 60448 | Mokena | 67 | C | 4 |
| 10 | 60615 | Chicago | 66 | C | 49 (3 health) |
| 11 | 60621 | Chicago | 66 | C | 49 (3 health) |
| 12 | 60649 | Chicago | 66 | C | 49 (3 health) |
| 13 | 60653 | Chicago | 66 | C | 49 (3 health) |
| 14 | 60472 | Robbins | 64 | C | 49 |
| 15 | 60620 | Chicago | 61 | C | 49 (3 health) |
| 16 | 60643 | Chicago | 61 | C | 49 (3 health) |
| 17 | 60652 | Chicago | 61 | C | 49 (3 health) |
| 18 | 60619 | Chicago | 56 | C | 49 (3 health) |
| 19 | 60628 | Chicago | 56 | C | 49 (3 health) |
| 20 | 60637 | Chicago | 56 | C | 49 (3 health) |
| 21 | 60491 | Homer Glen | 55 | C | 0 |
| 22 | 60410 | Channahon | 53 | D | 0 |
| 23 | 60914 | Bourbonnais | 45 | D | 0 |
| 24 | 60431 | Joliet | 43 | D | 115 (11 health) |
| 25 | 60481 | Wilmington | 41 | D | 65 |
Overview
Illinois's 1st District serving an estimated 28,003,094 residents encompasses 25 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (63/100).
755 EPA violations have been recorded across this district's water systems. 42 are health-based violations. About 76% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Gross Beta — 136 violations
- Chlorite — 123 violations
- Consumer Confidence Report Rule — 74 violations
- Revised Total Coliform Rule — 73 violations
- Surface Water Treatment Rule — 63 violations
Housing Context
Homes in this district were built on average around 1972 (~54 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 1 ZIP code in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 25 ZIP codes in Illinois's 1st District.