Delaware water quality
Delaware has 380 active public water systems (1,261 on file total), 135 of them graded by TapGraded.
Grade distribution
Biggest water systems
WILMINGTON WATER DEPARTMENT
WILMINGTON, DE · 107,976 served
VEOLIA WATER DELAWARE, INC
WILMINGTON, DE · 100,495 served
NEWARK WATER DEPARTMENT
NEWARK, DE · 40,000 served
DOVER WATER DEPARTMENT
DOVER, DE · 39,491 served
DEWEY BEACH WATER DEPARTMENT
FRANKFORD, DE · 31,000 served
REHOBOTH BEACH WATER DEPARTMENT
REHOBOTH BEACH, DE · 25,000 served
MIDDLETOWN WATER DEPARTMENT
MIDDLETOWN, DE · 17,700 served
SUSSEX SHORES WATER COMPANY
BETHANY BEACH, DE · 12,450 served
BETHANY BEACH WATER DEPARTMENT
BETHANY BEACH, DE · 12,000 served
SMYRNA WATER DEPARTMENT
SMYRNA, DE · 11,813 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
WILMINGTON WATER DEPARTMENT
WILMINGTON, DE · 107,976 served
VEOLIA WATER DELAWARE, INC
WILMINGTON, DE · 100,495 served
NEWARK WATER DEPARTMENT
NEWARK, DE · 40,000 served
DEWEY BEACH WATER DEPARTMENT
FRANKFORD, DE · 31,000 served
REHOBOTH BEACH WATER DEPARTMENT
REHOBOTH BEACH, DE · 25,000 served
SMYRNA WATER DEPARTMENT
SMYRNA, DE · 11,813 served
SUSSEX SHORES WATER COMPANY
BETHANY BEACH, DE · 12,450 served
DOVER WATER DEPARTMENT
DOVER, DE · 39,491 served
MIDDLETOWN WATER DEPARTMENT
MIDDLETOWN, DE · 17,700 served
BETHANY BEACH WATER DEPARTMENT
BETHANY BEACH, DE · 12,000 served
Source: EPA SDWIS/ECHO · Data as of 2026Q2