GroundRosterEnviro Testing/Keystone Evironmental Services
| Contact on the state list | Christian Tarnowski |
| Listed as | Radon Mitigation Contractor |
| Status | On the NYSDOH list; New York does not license radon professionals |
| Based in | Binghamton, Broome County, New York |
| Counties served, per the state list | All 62 New York counties |
"Based in" is the city and county of the address on the business's license record. That can be a mailing address; it doesn't tell you where the business works.
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 NYS Department of Health certified radon tester and mitigation contractor lists, last checked 2026-11-02. See the issuing agency.
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