| Northstar Mechanical | 3603 Walker Road | 519-944-5555 |
| Mr. Rooter Plumbing | 2-2680 Ouellette Avenue | 519-969-9333 |
| Troy Life & Fire Safety Ltd. | 2997 Deziel Drive | 519-945-4777 |
| Encore Mechanical | 11388 Tecumseh Road | 519-979-3572 |
| Vollmer Inc. | 3822 Sandwich Street | 519-966-6100 |
| Service Plumbing | 2661 Langlois Avenue | 519-256-0401 |
| Pronto Plumbing | 3275 Bruce Avenue | 519-945-4119 |
| Eagle Plumbing | 5205 8th Concession, Maidstone | 519-737-7778 |
| R.S. Craig Plumbing | 2247 Janette Avenue | 519-977-7011 |
| W.A. Atkinson Plumbing | 5448 Concession 5 | 519-736-3293 |
| Proactive Water Solutions | 10-242 Applewood, Vaughan | 416-249-2837 |
| Caledon Creek Mechanical | 18023 Horseshoe Hill Road | 519-927-0190 |
| Wallace-Kent Sprinklers | 304A Arnold, Wallaceburg | 519-627-8719 |
| CJ Bondy Plumbing | 200 St. Arnaud, Amberstburg | 519-736-2138 |
| Western Fire Protection Inc. | 21 Enterprise Drive, London | 519-641-3059 |
| Kenwil Services Ltd. | 3695 Russell Street | 519-977-7919 |
| KZ Plumbing and Heating | 2567 Gatwick | 519-564-9109 |
| Performance Fire Protection | 950B Tecumseh Road West | 519-997-3233 |
| Sentry Fire Protection | 275 Richmond, Chatham | 519-351-2217 |
| Automatic Fire Protection | 956 St. Louis | 519-563-8194 |
| Best Plumbing | 119 Exeter, London | 519-438-6565 |
| Policella Plumbing | 162 Oak West, Leamington | 519-326-3033 |
| Richardston Fire Protection | 2-49 Progress Drive, St. Thomas | 519-631-6111 |
| RFG Plumbing | 13007 Hyland Side Road, Essex | 519-817-7117 |
| Haller Mechanical | 1537 McDougall Street | 519-254-4635 |
| Protrades Mechanical | 2714 Meighen | 519-945-8800 |
| Windsor Emergency Plumbing | 8322 Kingston | 519-563-9056 |
| Grossi Plumbing | 238 Talbot West | 519-326-9018 |
| Iaccetta Plumbing | 1395 Parent | 519-564-0873 |
| DWV Waterworks | 1885 Grillo, LaSalle | 519-995-3702 |
| BGIS | 4175 14th, Markham, ON | 905-943-4100 |
| Lekter Industrial Services | 500 Harvard, Belle River, ON | 519-727-3713 |
| Johnson Controls / Tyco | 4525 Rhodes Drive, Unit 700 | 519-966-1910 |
| S.M. Green Plumbing | 4772 Tecumseh Road East | 519-948-2709 |
| Syles Mechanical Services | 3255 Odessa, Tecumseh, ON | 519-979-2090 |
| Bubby's Plumbing | 1074 Crawford | 519-980-6054 |
| DC Basement Waterproofing | 2221 Dougall | 226-345-6767 |
| LEaC Shield Ltd. | 123 Consortium, London, ON | 1-855-946-7183 |
| Plumbhouse Plumbing | 20 Pacific Court, #4, London, ON | 1-519-453-4650 |
| FCFP | 160 Adelaide, London, ON | 1-519-668-0010 |
| CKG Flow Plumbing | 3846 Peter | 519-365-6371 |
| FSR Mechanical | 9 Bighorn Trail, Nobleton, ON | 1-416-881-8441 |
| Naylor Building Partnerships | 455 North Service Rd E. Oakville, ON | 1-905-338-8000 |
| Lou's Fire Protection Services | 1705 East Gate Estates | 226-280-1134 |
| JMR Electric | 301 Thames Road East, Exeter, ON | 1-519-235-1516 |
| Automatic Fire Protection | 956 St. Louis | 519-563-8194 |
| Dordan Mechanical | 227 Victoria, New Hamburg, ON | 1-519-662-9900 |
| Sarnia Plumbing | 1445 Churchill, Sarnia, ON | 1-519-332-6788 |
| Bryant Heating Cooling Plumbing | 3194 Devon | 226-773-6184 |
| Classic Fire & Life Safety | 160 Adelaide South, London, ON | 1-519-668-0010 |
| Warkentin Plumbing | 54 Mill Street East, Kingsville, ON | 519-733-5832 |
| LARMIK Plumbing | 1211 Janisse | 226-773-2807 |
| Transparent Backflow Services | 473 Alexmuir, Waterloo, ON | 1-519-574-8776 |
| MSB Mechanical Ltd. | 1160 Kerrisdale, Unit 7, Newmarket, ON | 1-905-898-7979 |
| Allsop Plumbing Inc. | 141 Road 3 East, Kingsville, ON | 1-519-890-9830 |
| Red Seal Fire Protection | 2720 St. Etienne | 548-888-3473 |
| Brian Warkentin Plumbing | 2542 Division Rd, Kingsville, ON | 519-563-8736 |
