| Business | Phone |
| Arizona Certified Backflow 3231 N Camino Suerte, Tucson 85750 | (520) 721-2881 |
| Backflow Prevention Specialist 31 E Sahuaro St, Tucson 85705 | (520) 792-3411 |
| Certified Backflow Testers 3038 E Eastland St, Tucson 85716 | (520) 326-6681 |
| Sinclair Backflow Svc 5438 E Fairmount St, Tucson 85712 | (520) 908-9770 |