| 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 | - |