| 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 | — |