Kentucky water quality
Kentucky has 446 active public water systems (2,216 on file total), 375 of them graded by TapGraded.
Grade distribution
Biggest water systems
LOUISVILLE WATER COMPANY
LOUISVILLE, KY · 806,997 served
KENTUCKY-AMERICAN WATER CO
LEXINGTON, KY · 669,042 served
NORTHERN KENTUCKY WATER DISTRICT
FT. THOMAS, KY · 259,949 served
WARREN COUNTY WATER DISTRICT
BOWLING GREEN, KY · 91,118 served
HARDIN COUNTY WATER DISTRICT #2
ELIZABETHTOWN, KY · 76,326 served
BOONE CO WATER & SEWER DISTRICT
BURLINGTON, KY · 66,300 served
PADUCAH WATER WORKS
PADUCAH, KY · 65,004 served
OWENSBORO MUNICIPAL UTILITIES
OWENSBORO, KY · 60,473 served
BOWLING GREEN MUNICIPAL UTILITIES
BOWLING GREEN, KY · 53,601 served
FRANKFORT PLANT BOARD
FRANKFORT, KY · 52,153 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
EDMONSON CO WATER DISTRICT
BROWNSVILLE, KY · 17,848 served
BIG SANDY WATER DISTRICT
CATLETTSBURG, KY · 13,044 served
SOUTHERN WATER & SEWER DISTRICT
MCDOQWELL, KY · 15,110 served
MOUNTAIN WATER DIST
PIKEVILLE, KY · 44,057 served
HARRISON CO WATER ASSOCIATION
CYNTHIANA, KY · 16,736 served
VERSAILLES WATER SYSTEM
VERSAILLES, KY · 17,822 served
HARDIN COUNTY WATER DISTRICT #2
ELIZABETHTOWN, KY · 76,326 served
FORT CAMPBELL WATER SYSTEM
FT. CAMPBELL, KY · 43,270 served
GEORGETOWN MUNICIPAL WATER SERVICE
GEORGETOWN, KY · 44,608 served
MEADE COUNTY WATER DISTRICT
BRADENBURG, KY · 33,313 served
Cities in Kentucky
Source: EPA SDWIS/ECHO · Data as of 2026Q2