In alphabetical order:
- Accurate Backflow Testing, Hampden, 207-862-6066
- American Plumbing & Backflow, Millinocket, 207-723-6549
- Augusta Fuel Company, Augusta, 207-623-3851 Ext. 203
- Backflow Device Testing, Clinton, 800-510-5377
- Backflow Testing, Clinton, 207-692-8644
- Beale’s Plumbing, Farmingdale, 207-441-7360
- Boyington’s Backflow Testing & Repair, Waldo, 207-722-3031 eve, 207-338-2430 day, 207-322-3633 cell
- Eastern Sprinkler Services, Auburn, 800-434-4337
- High Tech Fire Protection Company, Poland, 207-998-2551
- Houle’s Plumbing Heating & AC, Waterville, 207-872-6762
- JP Clarke Plumbing, Canaan, 207-474-8024 bus, 207-399-7210 cell
- Maine Fire Protection, Bangor, 207-942-8809
- Mechanical Services, Augusta, 207-626-0822
- Meter & Backflow Services, Concord, NH, 800-356-1717
- Provencal Plumbing, Skowhegan, 207-431-8161
- Sprinkler Systems Inc, Lewiston, 207-782-0104
- Thayer Corporation, Auburn, 800-649-4197