Every contractor record on PlumbCircuit traces back to a public state licensing board.
DLCP
DC DLCP business license verification.
DBPR
DBPR weekly roster CSV.
SOS
GA SOS license verification.
IDFPR
IDFPR roster — interactive lookup.
DLLR
MD DLLR plumbing board.
NC Board of Examiners
NC Plumbing/Mechanical board.
eLicense
OH eLicense lookup.
CCB
Oregon CCB licensed contractors. Filtered to plumbing professions.
PALS
PA PALS search.
TSBPE
Texas State Board of Plumbing Examiners — no JSON API; CSV uploads only.
DPOR
VA DPOR lookup.