Certified radon testers & mitigatorsEntry — verified 29 Aug 2026

Entry № RRS-1G0006

John S. Swett

Radon Abatement Services

Last verified August 29, 2026. Methodology

Credential number
RRS-1G0006
Credential body
NRSB
Status
current Certified. Current in the source file.
Services
mitigation
City
Chevy Chase
County
Not on the source file
State
Maryland
Phone
Not on the source file
Source
https://nrsb.org/find-a-pro/
Fig. 5 — Chevy Chase, MD, approximate. Pin is the city on the official file, not a street address.

§ 5.1

Places on the source file

Claim or update this listing. A claim cannot add someone who is missing from the official file.