CITY REPORT
IL
9 HEALTH VIOLATIONS
Chicago, IL Water Quality Report
3 ZIP codes · 5 water systems · Updated 2026-03-16
Data: EPA SDWIS Last verified: 2026-03-16
3
ZIP Codes
5
Water Systems
3
ZIPs with Violations
D · 54
Avg Safety Score
Zone 2
Radon Risk (Moderate)
Overview
We track water quality and home safety data for 3 ZIP codes in Chicago, Illinois, covering 5 community water systems serving approximately 8,239,164 people.
3 of 3 ZIP codes (100%) have recorded EPA violations. 9 health-based violations documented.
Home Safety Score
Average Home Safety Score for Chicago: D (54/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Chicago water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0093 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 1 ZIP code
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Gross Beta | Radionuclides | 52 | 3 |
| Chlorite | Disinfection Byproducts | 48 | 3 |
| Consumer Confidence Report Rule | Reporting | 20 | 3 |
| Revised Total Coliform Rule | Microbiological | 20 | 3 |
| Surface Water Treatment Rule | Treatment Technique | 16 | 3 |
Areas with Most Violations
All ZIP Codes in Chicago
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.