| ORLANDO UTILITIES COMMISSION | 536,466 | 51 | Clean |
| OCUD/EASTERN WATER SYSTEM (2 WP) | 293,374 | 41 | Clean |
| OCUD/WESTERN REGIONAL WTR SYS (5 WPS) | 206,742 | 40 | Detected |
| CFTOD CENTRAL (4 WPS) | 136,500 | 46 | Clean |
| WINTER PARK, CITY OF (3 WPS) | 82,984 | 67 | Clean |
| OCUD/SOUTHERN WATER SYS (5 WPS) | 80,738 | 27 | Clean |
| WINTER GARDEN WATER DEPT (3 WPS) | 72,205 | 83 | Detected |
| APOPKA, CITY OF (5 WTPS) | 59,113 | 63 | Detected |
| UNIVERSITY OF CENTRAL FLORIDA | 44,103 | 144 | Clean |
| OCOEE, CITY OF (2 WPS) | 34,000 | 208 | Detected |
| MAITLAND, CITY OF (3 WPS) | 13,370 | 53 | Clean |
| FLAMINGO CROSSING (CONSEC.) | 9,704 | 1 | — |
| CENTRAL FLORIDA RESEARCH PARK | 9,200 | 29 | Clean |
| OAKLAND TOWN OF | 6,202 | 51 | Detected |
| PLURIS-WEDGEFIELD INC | 6,157 | 82 | Clean |
| TAFT WATER ASSOCIATION | 4,232 | 112 | Clean |
| TOWN OF EATONVILLE | 2,727 | 284 | — |
| ZELLWOOD STATION (CONSEC) | 2,571 | 61 | — |
| ROCK SPRINGS MHP | 1,338 | 95 | — |
| ZELLWOOD WATER USERS INC. (2 WPS) | 1,320 | 93 | — |
| CLARCONA RESORTS | 1,290 | 122 | — |
| STARLIGHT RANCH MOBILE HOME ESTATES | 1,221 | 87 | — |
| CRESCENT HEIGHTS S/D(CONSEC) | 969 | 15 | — |
| HIDDEN VALLEY MOBILE HOME PARK | 907 | 50 | — |
| TANGERINE PARK | 851 | 33 | — |
| OCOEE PINES (CONSECUTIVE) | 834 | 2 | — |
| OCUD/NORTHEAST RESORT (CONSECUTIVE) | 772 | 0 | — |
| SILVER STAR VILLAGE (2 WPS) | 639 | 54 | Detected |
| BRIGHTWOOD MANOR MHP | 420 | 64 | — |
| OCUD/MAGNOLIA WOODS CONSEC.WTR SYSTEM | 347 | 25 | — |
| VALENCIA ESTATES MHP | 305 | 105 | — |
| OUC BOGGY SOUTH (CONSEC) | 300 | 0 | — |
| STANTON ENERGY CENTER | 200 | 30 | — |
| OCUD/DAETWYLER SHORES (CONSEC) | 189 | 37 | — |
| ONE GOLDEN OAK (CONSECUTIVE) | 175 | 1 | — |
| OLA BEACH IMPROVEMENT ASSOCIATION | 145 | 58 | — |
| DAVIS SHORES (CONSEC) | 143 | 56 | — |
| HAMPDEN DUBOSE ACADEMY | 140 | 19 | — |
| ORANGE COUNTY NATIONAL GOLF CENTER | 130 | 4 | — |
| PINE ISLE MOBILE VILLA | 127 | 82 | — |
| KOREAN PRESBYTERIAN CHURCH OF ORLANDO | 127 | 32 | — |
| BIG OAKS MOBILE HOME PARK | 125 | 41 | — |
| LAKESIDE COTTAGES AND RV PARK | 116 | 274 | — |
| PREMIER ACADEMY | 100 | 16 | — |
| CHRIST CHAPEL FLORIDA INC. | 100 | 47 | — |
| VALLEY MHP, THE | 98 | 47 | — |
| UNIVERSITY SUN ESTATES - COLLEGE PARK | 90 | 78 | — |
| UNIVERSITY SUN ESTATES 2;3 | 78 | 100 | — |
| HARRISON'S TRAILER PARK | 70 | 130 | — |
| HERMANN ENGELMANN #6 | 69 | 139 | — |