verify a 21J COC here:

Please feel free to contact us for more information:
UST Inspection Services Inc.
781-383-UST3 (8783)
AG@USTinspection.com

Mass Dept Of Revenue, 21J Certificate of Complianceโ€‹

5 Allen Streetโ€‹Newburyport, MA 01950โ€‹781-383-UST3 (8783)

As a Commonwealth of Massachusetts, Registered Professional Engineering (P.E.) Corporation, UST Inspection Services is uniquely qualified to certify Certificate of Compliance applications in accordance with 503 CMR ยง 2.07(2)(c) and (d).