How can I tell if my plumber is licensed in Minnesota?
Ask the plumber for their Minnesota Department of Labor and Industry — Plumbing Licensing license number, then verify it at the board's public lookup. The license must be Active, the class must include Master Plumber / Journeyworker Plumber / Plumbing Contractor, and there must be no open disciplinary actions. Groundcheck (earthmove.io/trust) does this in under 90 seconds and cross-checks court, OSHA, and BBB records simultaneously.
Confirming a plumber's license in Minnesota is a 3-step process. First, get the license number from the contractor — every legitimate plumber working in Minnesota should have one and should give it on request. If they refuse or hedge, walk away. Second, plug it into the Minnesota Department of Labor and Industry — Plumbing Licensing public lookup at https://www.dli.mn.gov/business/plumbing-licensing. Third, verify three fields on the lookup result: license status (must read "Active"), expiration date (must be in the future), and disciplinary history (must be clean).
What classification matters: Master Plumber / Journeyworker Plumber / Plumbing Contractor. Minnesota plumbers working under any other classification are not authorized for the installs, repairs, and maintains water supply, drainage, gas, and sewer systems in residential and commercial buildings you're hiring them for. Confirm the license covers the type of work being performed.
Red flags that the license isn't legitimate or the plumber is misrepresenting: the license number doesn't return a result, the lookup returns a different name or business than you were given, the status is "Suspended" or "Inactive," the license is in another contractor's name (the plumber is using someone else's license — illegal in every state), or the disciplinary history shows multiple open complaints.
What if the plumber won't share their license number? In Minnesota, every licensed plumber is required to display the license number on all advertising, business cards, contracts, and vehicles. If they can't or won't provide it, they're either unlicensed or hiding something.
The fast path: run a free Groundcheck at earthmove.io/trust. Enter the contractor name and Minnesota as the state. Groundcheck queries Minnesota Department of Labor and Industry — Plumbing Licensing, the Secretary of State, federal court records, OSHA inspection history, and BBB complaints, then returns a single sourced verdict. The contractor is never notified.
Detailed Minnesota plumber licensing rules: earthmove.io/trust/license/plumber/minnesota.
Verify a Minnesota plumber now
Free Groundcheck cross-references Minnesota Department of Labor and Industry — Plumbing Licensing licensing with court records, OSHA history, and BBB complaints. Under 90 seconds. The contractor is never notified.