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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| D. Michael Gawel | Kent, CT | — | Installer | 5803 |
| Dale D Heser | Clinton, CT | — | Installer | 4090 |
| Dale Madsen | Ghent, NY | — | Installer | 6487 |
| Dan P Mackin Jr. | Griswold, CT | — | Installer | 5718 |
| Dan R Hruska | Colchester, CT | — | Pumper / Cleaner | 5400 |
| Dan R Zawisza | East Haddam, CT | — | Installer | 5374 |
| Dan Settanni Jr | Bethel, CT | — | Installer | 2849 |
| Dana S Lambert | Willington, CT | — | Installer | 3500 |
| Daniel A Hripak | Trumbull, CT | — | Installer | 6025 |
| Daniel Avery | Somers, CT | — | Installer | 2502 |
| Daniel C Sweeney | Washington Depot, CT | — | Installer | 5888 |
| Daniel E Jennings | Old Saybrook, CT | — | Installer | 4057 |
| Daniel E Wollenberg | Terryville, CT | — | Installer | 2920 |
| Daniel Epifano | Fairfield, CT | — | Installer | 395 |
| Daniel H Page | Wallingford, CT | — | Installer | 5460 |
| Daniel Hinckley | Somers, CT | — | Installer | 5157 |
| Daniel J Cellini | Easton, CT | — | Installer | 5485 |
| Daniel J Doherty | Sandy Hook, CT | — | Installer | 6028 |
| Daniel J Dziadul | Broad Brook, CT | — | Installer | 6255 |
| Daniel J Gualtiere | Pleasant Valley, NY | — | Installer | 6541 |
| Daniel J Hughes | Norwalk, CT | — | Installer | 5615 |
| Daniel J Natale | Cos Cob, CT | — | Installer | 3855 |
| Daniel J Vinci | North Haven, CT | — | Installer | 6511 |
| Daniel Joseph Bertrand | West Hartford, CT | — | Pumper / Cleaner | 5721 |
| Daniel K Bahre | Collinsville, CT | — | Installer | 3520 |
| Daniel L Quinn | Preston, CT | — | Installer | 5016 |
| Daniel Loos | East Hampton, CT | — | Installer | 3012 |
| Daniel M Delaney | Harwinton, CT | — | Installer | 5711 |
| Daniel M Dudzic | Somers, CT | — | Installer | 6143 |
| Daniel Mark Sehl | Salem, CT | — | Installer | 6568 |
| Daniel P Stetson | Wethersfield, CT | — | Installer | 3233 |
| Daniel Papuga | Canterbury, CT | — | Installer | 1300 |
| Daniel Pivola | Shelton, CT | — | Installer | 2127 |
| Daniel Rice | Voluntown, CT | — | Pumper / Cleaner | 5279 |
| Daniel Roberge | Newport, RI | — | Installer | 5607 |
| Daniel Rubio Hernandez | Guilford, CT | — | Installer | 6570 |
| Daniel Tyler Lucia | Dover Plains, NY | — | Installer | 6532 |
| Daniel Uccello | Collinsville, CT | — | Installer | 6228 |
| Daniel W Allen | Hartford, CT | — | Installer | 3939 |
| Daniel W Jones | Plainville, CT | — | Pumper / Cleaner | 5703 |
| Danny B Carrier | Plainville, CT | — | Installer | 6052 |
| Danny J Macaulay | North Granby, CT | — | Installer | 5852 |
| Darby L Pollansky | Coventry, CT | — | Installer | 5492 |
| Darien S Lewie | Granby, CT | — | Installer | 6389 |
| Darin S Renihan | Woodbury, CT | — | Installer | 5103 |
| Darrell R Wilcox | Coventry, CT | — | Installer | 3912 |
| Darren A Wilcox | Tolland, CT | — | Installer | 6379 |
| Darrin W Witham | Terryville, CT | — | Installer | 4049 |
| Daryl A Parker | Bolton, CT | — | Installer | 6079 |
| Daryl J Lewis | Bethel, CT | — | Installer | 5764 |
| Dave F Shrack | New Milford, CT | — | Installer | 5560 |
| David A Ballerini | Monroe, CT | — | Installer | 2671 |
| David A Chevrette | Plantsville, CT | — | Installer | 4055 |
| David A Delfino | Bristol, CT | — | Installer | 3650 |
| David A Potts | Old Saybrook, CT | — | Installer | 5649 |
| David A Rubino | Griswold, CT | — | Installer | 5923 |
| David A Smith | Staffordville, CT | — | Installer | 3186 |
| David Andronaco | New Canaan, CT | — | Installer | 5217 |
| David B Duff | Canton, CT | — | Installer | 2267 |
| David B Euvrard | Sharon, CT | — | Installer | 5507 |
| David Benn | Bradford, RI | — | Installer | 4097 |
| David Blass | Falls Village, CT | — | Installer | 5938 |
| David C Banker | Pawcatuck, CT | — | Installer | 3480 |
| David C Jewett | Old Lyme, CT | — | Installer | 5751 |
| David C Swanson | Washington Depot, CT | — | Pumper / Cleaner | 5158 |
| David C. Armbruster | Terryville, CT | — | Installer | 6526 |
| David D Darley | Durham, CT | — | Installer | 4046 |
| David Desaulnier | Putnam, CT | — | Installer | 3685 |
| David E Henrici | Salem, CT | — | Installer | 3136 |
| David E Nichols | Putnam, CT | — | Installer | 5438 |
| David E Stavens | Ellington, CT | — | Installer | 3637 |
| David E Strmiska | Canterbury, CT | — | Installer | 4005 |
| David E Tofinchio | Stratford, CT | — | Installer | 3896 |
| David F Johnson | Winsted, CT | — | Installer | 5371 |
| David G Amendola | Westbrook, CT | — | Installer | 5653 |
| David Gesiak | Colchester, CT | — | Installer | 6333 |
| David Giorlando | Westport, CT | — | Installer | 6340 |
| David Hadley | New London, CT | — | Pumper / Cleaner | 5307 |
| David J Benjamin | Lebanon, CT | — | Installer | 5748 |
| David J Curtis | Barkhamsted, CT | — | Installer | 5376 |
| David J Gasperini | Ashley Falls, MA | — | Pumper / Cleaner | 158 |
| David J Iacuone | Oxford, CT | — | Installer | 6524 |
| David J Lytwyn | Willington, CT | — | Installer | 5882 |
| David J Milano | Madison, CT | — | Installer | 6246 |
| David J Pivola | Shelton, CT | — | Installer | 6195 |
| David J Rizzardi | Irvington, NY | — | Installer | 1706 |
| David J Schlaefer | Ashford, CT | — | Installer | 5922 |
| David J Searles | Danbury, CT | — | Installer | 5197 |
| David J Smith | Wilton, CT | — | Installer | 2979 |
| David K Stearns | Storrs, CT | — | Installer | 6013 |
| David K Zaleski | Burlington, CT | — | Installer | 6347 |
| David Kalinowski | Wolcott, CT | — | Installer | 5717 |
| David Krajec | Waterford, CT | — | Installer | 3038 |
| David L Geismar | Norwalk, CT | — | Pumper / Cleaner | 5297 |
| David L Rutter | Portland, CT | — | Installer | 5977 |
| David M Pope | Watertown, CT | — | Installer | 3759 |
| David M Reiner | Oxford, CT | — | Installer | 5010 |
| David Massey | Madison, CT | — | Installer | 2689 |
| David Mylchreest Jr | Middletown, CT | — | Installer | 3825 |
| David N Hoover | Glastonbury, CT | — | Installer | 5435 |
| David P Baker | Killingworth, CT | — | Installer | 3089 |
| David P Garceau | Chaplin, CT | — | Installer | 5261 |
| David P Gassira | North Branford, CT | — | Pumper / Cleaner | 5699 |
| David P Lucas | Cromwell, CT | — | Installer | 5719 |
| David P Maker | Niantic, CT | — | Installer | 2882 |
| David P Rogers | Shelton, CT | — | Installer | 3403 |
| David P Torielli | Danbury, CT | — | Installer | 5355 |
| David P Wolkowicz | New Hartford, CT | — | Installer | 2960 |
| David R Cole Jr | Brookfield, CT | — | Installer | 3485 |
| David R Knowlton | Meriden, CT | — | Pumper / Cleaner | 5389 |
| David Robert | Morris, CT | — | Installer | 3998 |
| David Roczniak | East Haddam, CT | — | Installer | 5064 |
| David Shaw | Litchfield, CT | — | Installer | 5235 |
| David Sobocinski | Milford, CT | — | Installer | 2794 |
| David Syme | Stafford Springs, CT | — | Pumper / Cleaner | 5057 |
| David Syrotiak | Bethlehem, CT | — | Installer | 5168 |
| David T Buyak | New Hartford, CT | — | Installer | 5873 |
| David Tinker | Brookfield, CT | — | Installer | 5296 |
| David W A Acheychek | North Branford, CT | — | Installer | 5821 |
| David W Erlandson | East Hampton, CT | — | Installer | 6117 |
| David W Marinaro | Watertown, CT | — | Installer | 5500 |
| David W Roller Jr | Shelton, CT | — | Installer | 3404 |
| David William Hawley | Thomaston, CT | — | Pumper / Cleaner | 5664 |
| Davis L Correll | Clinton, CT | — | Pumper / Cleaner | 5146 |
| Davis L Correll | Clinton, CT | — | Installer | 5735 |
| Dean A Cawthra | Shelton, CT | — | Installer | 3240 |
| Dean A Christensen | Granby, CT | — | Installer | 5307 |
| Dean A Rotatori | Naugatuck, CT | — | Installer | 5632 |
| Dean A Soucy | Portland, CT | — | Installer | 5382 |
| Dean Bergstrom | Watertown, CT | — | Installer | 3027 |
| Dean Collins | South Windsor, CT | — | Installer | 5173 |
| Dean F Anderson | Clinton, CT | — | Installer | 6539 |
| Dean J Veno | Fairfield, CT | — | Installer | 5698 |
| Dean L Bonnin | Norwich, CT | — | Installer | 5728 |
| Deborah K Corcoran | Mansfield Center, CT | — | Installer | 5596 |
| Dennis A Moriarty | Stamford, CT | — | Installer | 3449 |
| Dennis B Magoon | Ellington, CT | — | Installer | 3376 |
| Dennis Conroy | Wolcott, CT | — | Installer | 3259 |
| Dennis E Brayman Jr | East Haddam, CT | — | Installer | 6212 |
| Dennis J Berry | Sandy Hook, CT | — | Installer | 5202 |
| Dennis J Tetreault | Danielson, CT | — | Installer | 6015 |
| Dennis P Jalbert | Harwinton, CT | — | Installer | 6279 |
| Dennis Purinton | Wakefield, RI | — | Installer | 5063 |
| Dennis R Nieman | Woodbury, CT | — | Installer | 3471 |
| Dereck J Galinski | Morris, CT | — | Installer | 3795 |
| Derek C Batick | Branford, CT | — | Installer | 6268 |
| Derek R Pieniadz | New London, CT | — | Pumper / Cleaner | 5717 |
| Devan M Dean | Voluntown, CT | — | Installer | 6396 |
| Devin C Alward | New Fairfield, CT | — | Installer | 6421 |
| Devon B Gibson | West Granby, CT | — | Installer | 6201 |
| Devon K Esau | Seymour, CT | — | Pumper / Cleaner | 5616 |
| Dewitt S Harrington | Brooklyn, CT | — | Installer | 5282 |
| Dinis Antunes | Shelton, CT | — | Installer | 6120 |
| Dino Esposito | Northford, CT | — | Installer | 3242 |
| Dino M Della | Shelton, CT | — | Pumper / Cleaner | 5512 |
| Domenic Dinunzio | Oakville, CT | — | Installer | 5670 |
| Domenic N Palladino | New Canaan, CT | — | Installer | 6247 |
| Dominic J Brown | Southbury, CT | — | Installer | 6433 |
| Dominick Briganti Jr | Darien, CT | — | Installer | 6387 |
| Dominick L Picchione | New Milford, CT | — | Installer | 5504 |
| Dominick Perretta | Stamford, CT | — | Installer | 2520 |
| Dominick Sillo | New Canaan, CT | — | Installer | 1500 |
| Don R Dicostanzo | Woodstock, CT | — | Installer | 5542 |
| Don W Truskauskas | Harwinton, CT | — | Installer | 5889 |
| Donald A Jencik | Canton, CT | — | Installer | 5250 |
| Donald A Perley | Brookfield, CT | — | Installer | 2691 |
| Donald B Eldridge Jr | Jewett City, CT | — | Installer | 6326 |
| Donald Cotrona | Wallingford, CT | — | Installer | 3935 |
| Donald F Morton | Niantic, CT | — | Installer | 5692 |
| Donald F Morton Iii | East Lyme, CT | — | Installer | 5946 |
| Donald F Spencer | Westerly, RI | — | Installer | 5918 |
| Donald Finn | Litchfield, CT | — | Installer | 5259 |
| Donald Flagge | Clinton, CT | — | Installer | 2555 |
| Donald G Bessette | Stafford Springs, CT | — | Pumper / Cleaner | 5565 |
| Donald G Hottes | New Milford, CT | — | Pumper / Cleaner | 5501 |
| Donald J Flint | Ellington, CT | — | Installer | 2248 |
| Donald J Massoni | Easthampton, MA | — | Installer | 3848 |
| Donald J Melodia | Shelton, CT | — | Installer | 1905 |
| Donald J Wasilewski | Wallingford, CT | — | Installer | 5508 |
| Donald L Meyer | Ivoryton, CT | — | Installer | 5080 |
| Donald Lapointe | Winsted, CT | — | Installer | 3567 |
| Donald R Andrews | Brookfield, CT | — | Installer | 3340 |
| Donald R Scheck | Orange, CT | — | Installer | 3634 |
| Donald R Venuti Jr. | Killingworth, CT | — | Installer | 5425 |
| Donald S Solomon Iii | Lebanon, CT | — | Installer | 5958 |
| Donald Slanetz | Enfield, CT | — | Installer | 5167 |
| Donald V Rahl Jr | Bluffton, SC | — | Installer | 5254 |
| Donat E Charron | Quinebaug, CT | — | Installer | 1358 |
| Donovan J Tomasiewicz | Torrington, CT | — | Pumper / Cleaner | 5652 |
| Doreen A Van Valkenburgh | Bethel, CT | — | Pumper / Cleaner | 5167 |
| Douglas B Burruano | Amston, CT | — | Installer | 6503 |
| Douglas B Miller | New Canaan, CT | — | Installer | 2232 |
| Drew Cappelli | Guilford, CT | — | Installer | 6458 |
| Duncan Downie | Old Saybrook, CT | — | Installer | 3589 |
| Duncan W Downie | Old Saybrook, CT | — | Pumper / Cleaner | 5548 |
| Dwayne A Ouellette | Somers, CT | — | Pumper / Cleaner | 5320 |
| Dwayne D Xenelis | Middlefield, CT | — | Installer | 5790 |
| Dwayne E Wyant | New Milford, CT | — | Installer | 5559 |
| Dwayne W Hall | Old Saybrook, CT | — | Pumper / Cleaner | 5608 |
| Dwight J Mellen | Newtown, CT | — | Installer | 3286 |
| Dylan Michael Waitkus | Tolland, CT | — | Installer | 6537 |
| Dylan T Dean | Moosup, CT | — | Installer | 6400 |
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