| Business | Phone |
| A-1 Backflow Prevention Co Indianapolis 46201 | (317) 446-0081 |
| Accurate Backflow 290 N Kirk Dr, Indianapolis 46234 | (317) 271-0959 |
| American Backflow Testing Svc 10667 Nassau St, Indianapolis 46234 | (317) 858-9769 |
| Flowcheck Inc 8304 W 87th St, Indianapolis 46278 | (317) 293-4598 |
| Mark Miller Backflow Indianapolis 46201 | (317) 626-9441 |