| Business | Phone |
| Aqca Radon Mitigation Cleveland 44118 | (216) 320-2454 |
| Suntech Radon Systems 2693 Wakefield Ln, Cleveland 44145 | (440) 871-5203 |
| Preferred Radon Testing 14000 Stoney Creek Dr, Cleveland 44133 | (440) 785-5890 |
| Mark Bornhorst Consulting Inc 2283 N Saint James Pkwy, Cleveland 44106 | (216) 397-1400 |