| CHERRY BROOK SCHOOL | COLLINSVILLE, CT | 615 | 260 | — |
| EAST HADDAM ELEMENTARY SCHOOL | MOODUS, CT | 600 | 17 | — |
| SKI SUNDOWN, INC. | NEW HARTFORD, CT | 600 | 13 | — |
| WATERTOWN WATER & SEWER - WESTGATE | OAKVILLE, CT | 600 | 58 | — |
| AQUARION-SUFFIELD | SHELTON, CT | 595 | 121 | — |
| GEORGE HERSEY ROBERTSON SCHOOL | COVENTRY, CT | 573 | 9 | — |
| KENT FALLS STATE PARK | PORTLAND, CT | 573 | 25 | — |
| EAST HAMPTON HIGH SCHOOL | EAST HAMPTON, CT | 568 | 332 | — |
| BRUNSWICK SCHOOL (LOWER & LOWER MIDDLE) | GREENWICH, CT | 567 | 85 | — |
| VALLEY REGIONAL HIGH SCHOOL | DEEP RIVER, CT | 565 | 23 | — |
| QUONNIPAUG HILLS - MAIN SYSTEM | BRANFORD, CT | 564 | 409 | — |
| COVENTRY GRAMMAR SCHOOL | COVENTRY, CT | 558 | 100 | — |
| BETHANY COMMUNITY SCHOOL | BETHANY, CT | 550 | 0 | — |
| PRESTON PLAINS WATER COMPANY | MASHANTUCKET, CT | 550 | 120 | — |
| EDGEMERE CONDOMINIUM ASSN., INC. | EAST HAMPTON, CT | 540 | 297 | — |
| CALVARY FELLOWSHIP SOUTHBURY | SOUTHBURY, CT | 540 | 6 | — |
| ELISABETH M. BENNET ACADEMY | MANCHESTER, CT | 536 | 72 | — |
| WADSWORTH FALLS/BATHROOM WELL | PORTLAND, CT | 527 | 13 | — |
| LEBANON ELEMENTARY SCHOOL | LEBANON, CT | 525 | 686 | — |
| SCWA, CHESTERFIELD DIVISION | GALES FERRY, CT | 524 | 2 | — |
| CANDLEWOOD KNOLLS WATER AUTHORITY | NEW FAIRFIELD, CT | 524 | 478 | — |
| EASTBURY SCHOOL | GLASTONBURY, CT | 523 | 98 | — |
| C E MURPHY SCHOOL | OAKDALE, CT | 520 | 217 | — |
| SALISBURY SCHOOL | SALISBURY, CT | 520 | 74 | — |
| WOODSTOCK MIDDLE SCHOOL | WOODSTOCK, CT | 511 | 26 | — |
| HEAD O MEADOW ELEMENTARY SCHOOL | NEWTOWN, CT | 506 | 286 | — |
| STONE BRIDGE CENTER FOR HEALTH & REHAB | NEWTOWN, CT | 504 | 303 | — |
| CTWC - SOUTH COVENTRY SYSTEM | CLINTON, CT | 501 | 232 | — |
| CAMP JEWELL-SENIOR | HARTFORD, CT | 500 | 114 | — |
| CAMP JEWELL-SUNRISE | HARTFORD, CT | 500 | 303 | — |
| ST LUKES SCHOOL ATHLETIC CENTER | NEW CANAAN, CT | 500 | 17 | — |
| SUNNY VALLEY TAX DISTRICT | NEW MILFORD, CT | 500 | 121 | — |
| POMFRET COMMUNITY SCHOOL | POMFRET CENTER, CT | 500 | 211 | — |
| PRESTON VETERANS MEMORIAL SCHOOL | PRESTON, CT | 500 | 45 | — |
| YESHIVA OF WATERBURY-DURHAM CAMPUS | WATERBURY, CT | 490 | 1,081 | — |
| KITEMAUG ORCHARD ASSOCIATION, INC. | UNCASVILLE, CT | 490 | 168 | — |
| WOODHAVEN APARTMENTS | WILLINGTON, CT | 489 | 78 | — |
| AQUARION-FALLS VILLAGE | SHELTON, CT | 488 | 236 | — |
| BRANCHVILLE SCHOOL | RIDGEFIELD, CT | 488 | 6 | — |
| PARISH HILL HIGH SCHOOL | CHAPLIN, CT | 487 | 22 | — |
| EAST HAMPTON MIDDLE SCHOOL | EAST HAMPTON, CT | 487 | 118 | — |
| NORTH WINDHAM ELEMENTARY SCHOOL | WILLIMANTIC, CT | 485 | 27 | — |
| MELISSA JONES SCHOOL | GUILFORD, CT | 484 | 79 | — |
| ASHFORD SCHOOL | ASHFORD, CT | 475 | 37 | — |
| AMITY REGIONAL JUNIOR HIGH SCHOOL | BETHANY, CT | 475 | 164 | — |
| CTWC - NORTHERN REGION-LAKEVIEW TERRACE | CLINTON, CT | 472 | 12 | — |
| HARMONY ACRES MOBILE HOME PARK | PLAINVILLE, CT | 465 | 232 | — |
| VILLAGE MARKET PLACE | GOSHEN, CT | 462 | 218 | — |
| NATHAN HALE-RAY HIGH SCHOOL | MOODUS, CT | 461 | 4 | — |
| AQUARION-LAKESIDE | SHELTON, CT | 455 | 165 | — |