| Gqc Well Commission | Vernon, CT | 360 | 340 | - |
| The Country School (Main Building) | Madison, CT | 360 | 21 | - |
| Kelly Lane Primary School | Granby, CT | 357 | 21 | - |
| Knollcrest Tax District | New Fairfield, CT | 356 | 163 | - |
| Hazardville - Rye Hill System | Enfield, CT | 352 | 4 | - |
| Canterbury Elementary School | Canterbury, CT | 350 | 77 | - |
| Whitby School | Greenwich, CT | 350 | 633 | - |
| Camp Mattatuck- Well #2 System | Hartford, CT | 350 | 63 | - |
| Washington Montessori School | New Preston, CT | 350 | 146 | - |
| Camp Woodstock - Upper Main Camp | Woodstock, CT | 346 | 10 | - |
| Hole in the Wall Gang Camp-Main System#1 | Ashford, CT | 335 | 23 | - |
| Newington VA Medical Center-Building 2E | West Haven, CT | 335 | 6 | - |
| Ctwc - Ashford Park Division | Clinton, CT | 334 | 31 | - |
| East Hampton Wpca - Royal Oaks System | East Hampton, CT | 328 | 303 | - |
| Aquarion-Pleasure Valley | Shelton, CT | 328 | 30 | - |
| Willington Senior Center & Housing | Willington, CT | 327 | 9 | - |
| Ethel Walker School | Simsbury, CT | 325 | 567 | - |
| Aquarion-Carmen Hill | Shelton, CT | 322 | 207 | - |
| Camp Woodstock - New Dining Well | Woodstock, CT | 322 | 22 | - |
| Jewett City Water Co., S & W System | Enfield, CT | 320 | 39 | - |
| Camp Connri | Hartford, CT | 319 | 76 | - |
| Classee Water System - Latimer Point | Stonington, CT | 316 | 52 | - |
| Killingworth Elementary School | Killingworth, CT | 315 | 21 | - |
| Knollwood Apartments | Storrs, CT | 312 | 108 | - |
| Candlewood Trails Association, Inc. | New Milford, CT | 312 | 350 | - |
| Wyndham Park Apartments | Windham, CT | 312 | 44 | - |
| Dr. Helen Baldwin School | Canterbury, CT | 310 | 153 | - |
| Pachaug Marina Campground | New London, CT | 310 | 74 | - |
| Aquarion-Timber Trails | Shelton, CT | 310 | 44 | - |
| Sterling Water System | Oneco, CT | 308 | 99 | - |
| Aquarion-Possum Ridge | Shelton, CT | 307 | 244 | - |
| Ctwc - General Water Division | Clinton, CT | 306 | 22 | - |
| Church of Christ the King | Old Lyme, CT | 305 | 0 | - |
| Bolton High School | Bolton, CT | 304 | 81 | - |
| Sunny Waters Mobile Home Park | Gales Ferry, CT | 303 | 84 | - |
| Meadows Apartments | Canterbury, CT | 301 | 33 | - |
| Justice Education Center Camp Inspire | Andover, CT | 300 | 69 | - |
| Franklin Elementary School | North Franklin, CT | 300 | 99 | - |
| Edmund D. Strang Scout Reservation | Derby, CT | 300 | 16 | - |
| Hartland Elem Sch & Town Bldgs | Hartland, CT | 300 | 392 | - |
| Lake Warramaug/Campground Well | Portland, CT | 300 | 29 | - |
| Lake Warramaug/Day Use Well | Portland, CT | 300 | 48 | - |
| Deer Lake Outdoor Center Dining - Well 2 | Killingworth, CT | 300 | 10 | - |
| Scwa, Barrett Division (Bar) | Gales Ferry, CT | 300 | 1 | - |
| Birch Groves Association, Inc | New Milford, CT | 300 | 225 | - |
| Lyme Academy of Fine Arts | Old Lyme, CT | 300 | 58 | - |
| The Rectory School | Pomfret, CT | 300 | 195 | - |
| The Frederick Gunn School, Inc. | Washington, CT | 300 | 291 | - |
| The Lake House | Wolcott, CT | 300 | 10 | - |
| Arrowhead Point Homeowners Assn Inc. | Brookfield, CT | 296 | 53 | - |