Verify a Maryland Plumber license

liveMD Contractor Licensing Board · profession key plumber

Live. We query the board directly for every check and the nightly canary is passing.

How Maryland Plumber license verification works

A Plumber in Maryland is licensed by the MD Contractor Licensing Board. PrimaryCheck looks the license up live at the board's public verification system (board lookup) by license number, or by name when no number is supplied. The record the board publishes is captured as evidence, hashed, and rendered into a proof PDF.

Fields returned for this board: license_number full_name first_name middle_name last_name suffix former_name category expiration city state zip trade_name address insured status.

Board note: MD-DLLR: Home Improvement Commission (calling_app HIC: CONTRACTOR/SALESMAN; the MHIC licence 05-nnnnnn-nn is printed in the address column, the reg field is the person's own number; a claim carrying the MHIC form falls back to a name search), Master Electricians (ME, insurance Status column), Plumbing (PLM, Insured column), HVACR (HVAC) on the Maryland Labor Public Query; plain HTTPS, no captcha; active licensees only; no DOB, no discipline. Live 2026-11-04 on 109672, 53363, 7961, 64679. home_inspector (REA) not mapped.

What a Plumber license check returns

Field check	Passes when
`license_number`	Equal to the board's number, ignoring prefix and leading zeros
`name`	Last name or declared alias matches; first name exact or nickname
`license_type`	The record is a Plumber license, strictly (no near-miss types)
`status`	The board shows an active status; probation is active with a flag
`expires`	Expiration is on or after today, where the board publishes it
`disciplinary_actions`	Recorded and flagged with any order documents; never silently dropped

Verdicts: verified, discrepancy, not_found, unable_to_verify (with a reason), pending. See how verdicts are decided.