Portland, ME Tap Water Quality

Water quality in Portland, ME is currently rated with a moderate C grade (average score: 63/100 across 9 ZIP codes). This rating indicates that while the water provided by Portland Water District-greater 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 27 health-based violations over the past 5 years highlights systemic challenges within Portland's water infrastructure. When violations occur, it means that drinking water tests revealed contaminant levels exceeding safe limits, triggering mandatory corrective actions by Maine Center for Disease Control and Prevention. 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 4 out of 9 ZIP codes in Portland 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.