How do I check a plumber's license in Missouri?

Missouri does not require a statewide plumber license. Missouri does not license plumbers at the state level. Kansas City, St. Louis, and Springfield issue municipal plumbing licenses — check the local jurisdiction.

When a state doesn't license a trade at the state level, verification leans on three things: (1) the local city or county building department's licensing or permit registry, (2) Secretary of State entity registration at Missouri Secretary of State, and (3) the contractor's public-record history — court judgments, liens, OSHA citations, and BBB complaints.

Step 1: Check whether the city or county where the work will be performed has a local contractor license. In Kansas City and St. Louis, many plumbers are required to register with the city building department.

Step 2: Confirm the business is registered with the Missouri Secretary of State (https://bsd.sos.mo.gov/) and that the filing status is active or in good standing. A dissolved or administratively revoked entity is a red flag — especially if the same address has a new entity registered.

Step 3: Run a free Groundcheck at earthmove.io/trust. The report pulls entity registration, court judgments, OSHA inspection history, and BBB complaints into one verdict. For unlicensed-at-state-level trades like plumbers in Missouri, the public-record history is where the trust signal lives.

The detailed Missouri plumber rules are documented at earthmove.io/trust/license/plumber/missouri.