| HARRISON CO WATER ASSOCIATION | | 16,736 | 0.0479 ug/L |
| CYNTHIANA MUNICIPAL WATER WORKS | | 7,263 | 0.0370 ug/L |
| FORT CAMPBELL WATER SYSTEM | | 43,270 | 0.0273 ug/L |
| GEORGETOWN MUNICIPAL WATER SERVICE | | 44,608 | 0.0120 ug/L |
| STURGIS WATER WORKS | | 3,490 | 0.0108 ug/L |
| WHITLEY CO WATER DISTRICT | | 9,825 | 0.0100 ug/L |
| CUMBERLAND FALLS HIGHWAY WATER DISTRICT | | 9,498 | 0.0086 ug/L |
| UNION COUNTY WATER DISTRICT | | 6,117 | 0.0086 ug/L |
| PADUCAH WATER WORKS | | 65,004 | 0.0081 ug/L |
| LOUISVILLE WATER COMPANY | | 806,997 | 0.0075 ug/L |
| CRITTENDEN-LIVINGSTON CO WATER DISTRICT | | 9,571 | 0.0073 ug/L |
| MT WASHINGTON WATER COMPANY | | 23,760 | 0.0072 ug/L |
| CANNONSBURG WATER DISTRICT | | 8,953 | 0.0068 ug/L |
| CORBIN UTILITIES COMMISSION | | 16,065 | 0.0067 ug/L |
| TAYLORSVILLE WATER WORKS | | 22,286 | 0.0065 ug/L |
| FLATWOODS WATER COMPANY | | 9,649 | 0.0065 ug/L |
| NORTH MCLEAN CO WATER DISTRICT | | 2,934 | 0.0065 ug/L |
| HARDIN COUNTY WATER DISTRICT #2 | | 76,326 | 0.0062 ug/L |
| LEDBETTER WATER DISTRICT | | 2,729 | 0.0062 ug/L |
| NORTH NELSON WATER DISTRICT | | 13,365 | 0.0057 ug/L |
| WHITESVILLE WATER WORKS | | 3,672 | 0.0056 ug/L |
| BEATTYVILLE WATER WORKS | | 8,428 | 0.0054 ug/L |
| GRAND RIVERS WATER SYSTEM | | 3,980 | 0.0052 ug/L |
| OWENSBORO MUNICIPAL UTILITIES | | 60,473 | 0.0050 ug/L |
| DAVIESS CO WATER DISTRICT | | 33,655 | 0.0050 ug/L |
| E DAVIESS CO WATER ASSOC INC | | 11,997 | 0.0050 ug/L |
| BUFFALO TRAIL WATER ASSOC | | 4,514 | 0.0050 ug/L |
| WEST SHELBY WATER DISTRICT | | 6,994 | 0.0046 ug/L |
| LYON COUNTY WATER DISTRICT | | 6,744 | 0.0044 ug/L |
| NORTH SHELBY WATER DISTRICT | | 14,660 | 0.0041 ug/L |
| EAST PENDLETON WATER DISTRICT | | 5,515 | 0.0041 ug/L |
| KENTUCKY-AMERICAN WATER CO | | 669,042 | Not detected |
| NORTHERN KENTUCKY WATER DISTRICT | | 259,949 | Not detected |
| WARREN COUNTY WATER DISTRICT | | 91,118 | Not detected |
| BOONE CO WATER & SEWER DISTRICT | | 66,300 | Not detected |
| BOWLING GREEN MUNICIPAL UTILITIES | | 53,601 | Not detected |
| FRANKFORT PLANT BOARD | | 52,153 | Not detected |
| ASHLAND WATER WORKS | | 44,402 | Not detected |
| MOUNTAIN WATER DIST | | 44,057 | Not detected |
| HOPKINSVILLE WATER ENVIRONMENT AUTHORITY | | 41,350 | Not detected |
| OLDHAM COUNTY WATER DISTRICT | | 38,409 | Not detected |
| GLASGOW WATER COMPANY | | 36,766 | Not detected |
| RICHMOND UTILITIES | | 35,640 | Not detected |
| NICHOLASVILLE WATER DEPARTMENT | | 35,266 | Not detected |
| MCCREARY COUNTY WATER DISTRICT | | 34,439 | Not detected |
| MEADE COUNTY WATER DISTRICT | | 33,313 | Not detected |
| DANVILLE CITY WATER WORKS | | 32,600 | Not detected |
| HENDERSON WATER UTILITY/NORTH | | 31,705 | Not detected |
| FRANKLIN WATER WORKS | | 31,602 | Not detected |
| BARDSTOWN MUNICIPAL WATER DEPT | | 31,185 | Not detected |
| HARDIN COUNTY WATER DISTRICT #1 | | 30,230 | Not detected |
| WINCHESTER MUNICIPAL UTILITIES | | 29,823 | Not detected |
| SOMERSET WATER SERVICE | | 29,700 | Not detected |
| FLORENCE WATER & SEWER | | 29,351 | Not detected |
| MADISONVILLE LIGHT & WATER | | 28,102 | Not detected |
| PRESTONSBURG CITY UTILITIES | | 26,788 | Not detected |
| HAZARD WATER DEPARTMENT | | 26,730 | Not detected |
| MURRAY WATER SYSTEM | | 26,302 | Not detected |
| MADISON CO UTILITIES DISTRICT | | 25,120 | Not detected |
| CAMPBELLSVILLE MUNICIPAL WATER | | 24,874 | Not detected |
| PAINTSVILLE MUNICIPAL WATER WORKS | | 24,354 | Not detected |
| SHELBYVILLE WATER & SEWER COMMISSION | | 23,760 | Not detected |
| HARDIN CO. WATER DIST #1/FT. KNOX | | 23,600 | Not detected |
| WESTERN PULASKI CO WATER DISTRICT | | 23,264 | Not detected |
| COLUMBIA/ADAIR UTILITIES DISTRICT | | 22,113 | Not detected |
| SOUTHEASTERN WATER ASSOC/NELSON VALLEY | | 21,895 | Not detected |
| MONTICELLO WATER & SEWER COMMISSION | | 21,000 | Not detected |
| BULLOCK PEN WATER DISTRICT | | 20,048 | Not detected |
| GRAYSON COUNTY WATER DISTRICT | | 20,033 | Not detected |
| ROWAN WATER INC | | 18,765 | Not detected |
| HARDINSBURG RO WTP | | 18,437 | Not detected |
| EDMONSON CO WATER DISTRICT | | 17,848 | Not detected |
| VERSAILLES WATER SYSTEM | | 17,822 | Not detected |
| HENRY COUNTY WATER DISTRICT #2 | | 17,716 | Not detected |
| HENDERSON COUNTY WATER DISTRICT | | 17,447 | Not detected |
| GREEN RIVER VALLEY WATER DISTRICT | | 17,431 | Not detected |
| CHRISTIAN CO WATER DISTRICT | | 17,248 | Not detected |
| LAUREL CO WATER DISTRICT #2 | | 16,899 | Not detected |
| MUHLENBERG CO WATER DISTRICT | | 16,845 | Not detected |
| PINEVILLE WATER SYSTEM | | 16,573 | Not detected |
| OHIO COUNTY WATER DISTRICT | | 16,511 | Not detected |
| BARBOURVILLE UTILITIES | | 16,420 | Not detected |
| ALLEN COUNTY WATER DISTRICT | | 16,398 | Not detected |
| MT STERLING WATER WORKS | | 16,391 | Not detected |
| MARION COUNTY WATER DISTRICT | | 16,311 | Not detected |
| NORTH MARSHALL WATER DISTRICT #1 | | 16,276 | Not detected |
| EAST LAUREL WATER DISTRICT | | 16,062 | Not detected |
| GREEN TAYLOR WATER DISTRICT | | 15,497 | Not detected |
| SOUTHERN WATER & SEWER DISTRICT | | 15,110 | Not detected |
| WOOD CREEK WATER DISTRICT | | 14,892 | Not detected |
| WEST LAUREL WATER ASSOC INC | | 14,878 | Not detected |
| GARRARD CO WATER ASSOC INC | | 14,806 | Not detected |
| LAWRENCEBURG WATER & SEWER DEPT | | 14,748 | Not detected |
| SOUTHERN MADISON WATER DISTRICT | | 14,707 | Not detected |
| BARKLEY LAKE WATER DISTRICT | | 14,284 | Not detected |
| BUTLER COUNTY WATER SYSTEM INC | | 14,256 | Not detected |
| PARIS WATER WORKS | | 14,139 | Not detected |
| JACKSON CO WATER ASSOCIATION | | 13,629 | Not detected |
| SPRINGFIELD WATER WORKS | | 13,205 | Not detected |
| BIG SANDY WATER DISTRICT | | 13,044 | Not detected |