Chicago, IL Tap Water Quality

Water quality in Chicago, IL is currently rated with a moderate C grade (average score: 68/100 across 86 ZIP codes). This rating indicates that while the water provided by Chicago is treated and regulated, there have been notable compliance issues or contaminant detections recently. Residents should stay informed about the specific challenges affecting their local supply.

The accumulation of 86 health-based violations over the past 5 years highlights systemic challenges within Chicago's water infrastructure. When violations occur, it means that drinking water tests revealed contaminant levels exceeding safe limits, triggering mandatory corrective actions by Illinois Environmental Protection Agency. The city relies on surface water, which may require significant treatment upgrades to address these recurring issues.

Additionally, lead exposure risk remains a critical issue for certain neighborhoods. EPA data indicates that 51 out of 86 ZIP codes in Chicago are rated as High or Very High risk for lead. This risk is often driven by aging homes with pre-1986 plumbing containing lead solder or service lines. Families in these areas should test their tap water and consider NSF/ANSI 53 certified filters.