Certified radon testers & mitigatorsEntry — verified 29 Aug 2026

Entry № 113929

Christopher Johnson

Geo Environmental Services, Llc

Last verified August 29, 2026. Methodology

Credential number
113929
Credential body
NRPP
Status
current Certified. Current in the source file.
Services
testing
City
Abingdon
County
Not on the source file
State
Maryland
Phone
(410) 871-8618
Source
https://nrpp.info/listings/bl-11507.html
Fig. 5 — Abingdon, 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.