| LEESBURG, CITY OF | 43,148 | 79 | Detected |
| EUSTIS, CITY OF (4 WTPS) | 39,721 | 91 | Detected |
| CLERMONT EAST WATER SYSTEM (2 WPS) | 39,279 | 40 | Detected |
| MOUNT DORA, CITY OF (2WPS) | 39,120 | 67 | Detected |
| LAKE UTILITY SERVICES INC NORTH (8 WPS) | 24,798 | 101 | Detected |
| GROVELAND WATER DEPARTMENT | 23,628 | 51 | — |
| TAVARES WATER DEPARTMENT (4 WPS) | 22,007 | 103 | Clean |
| MINNEOLA WATER DEPARTMENT (2 WPS) | 21,521 | 66 | Detected |
| VILLAGES OF LAKE-SUMTER - WTPS 1, 3, ; 5 | 18,675 | 95 | Detected |
| LAKE UTILITY SERVICES INC SOUTH | 13,198 | 36 | Clean |
| MASCOTTE WATER DEPARTMENT | 12,250 | 117 | Clean |
| CLERMONT, CITY OF (2 WPS) | 10,048 | 51 | Clean |
| SOUTHLAKE UTILITIES | 9,950 | 16 | Detected |
| CITY OF LEESBURG / EAST | 9,716 | 24 | Detected |
| LADY LAKE CENTRAL - WPS 1,2,3 | 7,090 | 85 | Detected |
| LEESBURG/THE PLANTATION | 5,141 | 36 | Clean |
| FRUITLAND PARK, CITY OF (3 WPS) | 5,127 | 52 | Detected |
| UMATILLA WATER WORKS (2 WPS) | 3,948 | 51 | Clean |
| SUGARLOAF WATER TREATMENT PLANT | 3,885 | 15 | — |
| EUSTIS EASTERN WTP | 3,301 | 3 | — |
| LEESBURG/ROYAL HIGHLANDS | 3,254 | 13 | — |
| CLERBROOK RV RESORTS (2 WPS) | 3,142 | 53 | — |
| MID-FLORIDA LAKES YACHT CLUB | 3,065 | 117 | — |
| ST. JOHN'S RIVER UTILITY INC | 2,498 | 67 | — |
| PENNBROOKE | 2,488 | 28 | — |
| LEESBURG/HIGHLAND LAKES | 2,444 | 25 | — |
| SILVER LAKE ESTATES | 2,355 | 27 | — |
| HOWEY IN THE HILLS (2 WPS) | 2,027 | 67 | — |
| HAWTHORNE AT LEESBURG | 1,883 | 74 | — |
| HOLIDAY RV VILLAGE | 1,725 | 19 | — |
| LAKE CORRECTIONAL INSTITUTION | 1,500 | 65 | — |
| WATER OAK COUNTRY CLUB ESTATES | 1,465 | 30 | — |
| HARBOR HILLS - 2 WTPS | 1,219 | 28 | Detected |
| LAKE GRIFFIN ISLES MHP (2 WTPS) | 1,212 | 40 | — |
| ROUND LAKE CHARTER SCHO | 1,200 | 32 | — |
| MONTVERDE WATER DEPARTMENT (2WPS) | 1,198 | 38 | — |
| HEATHROW COUNTRY ESTATES (RED TAIL) | 1,057 | 12 | — |
| OAK SPRINGS MOBILE HOME PARK | 993 | 47 | — |
| WEDGEWOOD SUBDIVISION | 980 | 40 | — |
| WESTERN SHORES SUBDIVISION | 963 | 38 | — |
| ASTATULA ELEMENTARY SCHOOL | 900 | 20 | — |
| SEMINOLE SPRINGS ELEMENTARY | 900 | 29 | — |
| MONTVERDE MOBILE HOME SD | 800 | 36 | — |
| SUMMIT CHASE VILLAS | 770 | 34 | — |
| SUNLAKE ESTATES | 751 | 43 | — |
| VALENCIA TERRACE SUBDIVISION | 750 | 39 | — |
| KING'S COVE SUBDIVISION | 732 | 31 | — |
| FAIRWAYS AT MOUNT PLYMOUTH | 660 | 9 | — |
| SPRING CREEK CHARTER SCHOOL | 640 | 26 | — |
| BLACK BEAR RESERVE | 625 | 11 | — |