Wilmington

Wilmington, DE receives a water quality score of 76/100 (Grade B) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 4 public water systems serving the area.

Wilmington's water quality is near the national average. While most systems meet EPA standards, some violations have been recorded. Residents may wish to review their specific water system's report for contaminant details.

Wilmington's score of 76 is 15 points below the Delaware state average of 91, and below the nationwide average of roughly 78/100 across all U.S. states.

For families looking to settle in Wilmington, the municipal tap water in this mid-size Delaware city generally provides a stable baseline quality that reflects its position in the Mid-Atlantic coastal plain. While overall testing shows satisfactory safety margins, the region's historic industrial and chemical legacy means prospective homebuyers should remain aware of potential environmental influences on local watersheds. Because the area is served by multiple distinct distribution systems, water characteristics can vary slightly depending on the neighborhood, prompting many residents to utilize home filtration systems for peace of mind. Keeping track of regular local reports will help newcomers navigate the unique environmental landscape of the area.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Delaware water quality rankings report →