GroundRosterJohn's Waterproofing
| Contact on the state list | Colton Barber, Matthew Shutt |
| Listed as | Radon Measurement Company |
| Status | On the Oregon Health Authority list; company has an NRPP or NRSB certified technician on staff |
| State | Oregon |
How to verify this license
We publish these details as they appear on the state list. Being on it is not a state license, and we do not vouch for the business. Before hiring, ask to see a current radon certification and a current certificate of insurance.
Checked against Oregon Health Authority radon measurement and mitigation company lists, last checked 2026-11-02. See the issuing agency.