Population Served
12.5K
Service Connections
4.1K
Total Violations
148
Health-Based Violations
19
Lead & Copper Data
Lead Level
Caution2.97 ppb
Action Level: 15 ppb (EPA) · Sampled: 2025-06-30
015 ppb action level
Copper Level
No copper sampling data available
System Details
- Water Source
- Purchased Surface Water
- System Type
- Community Water System
- City
- MARKHAM
- ZIP Code
- 60428
- Counties Served
- Cook
- Cities Served
- MARKHAM
- Open Violations
- 0
- State
- Illinois
Violation Summary
148
Total Violations
19
Health-Based
0
Open Now
Most recent violation: 2025-07-02
Explore Illinois Water Quality
See all water systems, lead data, and violation trends for Illinois.
Data source: EPA ECHO SDWIS Bulk Download (Jan 2026). PWSID: IL0311770.SafeWater Home