Missouri Plumber License Lookup and Verification

There's No Single State Database

If you're trying to verify a plumber's license in Missouri, the first thing you need to know is that there's no statewide lookup tool. Missouri's Division of Professional Registration (DPR) operates the MOPRO portal, but it doesn't list plumbers. The DPR's database covers electricians, cosmetologists, engineers, and dozens of other professions — but plumbing licensing falls entirely under local jurisdiction. The MOPRO portal has no licensing categories for plumbing apprentices, journeymen, or master plumbers.

This means verifying a plumber's credentials requires contacting the specific city or county that issued their trade card. There's no shortcut and no unified search.

How to Verify by Jurisdiction

Kansas City: The Development Services Department handles plumbing licenses. License verification requests go through CompassKC, the city's online permitting portal. You can also call the department directly to confirm whether a specific plumber holds an active Certificate of Qualification.

St. Louis County: The Department of Transportation and Public Works oversees plumbing licenses. The county's Accela Citizen Access portal has a public-facing lookup for permits and may include licensee information. For direct verification, contact the Board of Plumbing Examiners.

St. Louis City: The Board of Examiners of Plumbers and Drainlayers maintains its own license records. Verification requires contacting the board directly — the city doesn't operate a self-service lookup for plumbing trade cards.

St. Charles County: The Division of Building and Code Enforcement uses the Citizenserve portal. Licensed plumbing contractors can be looked up through the portal's public access features.

Springfield: Building Development Services maintains trade certification records. Contact the department for verification of active journeyman or master plumber status.

Jefferson City: The Department of Building Regulations handles license records for plumbing at all levels (apprentice through contractor). Call the Plumbing Inspector's office for verification.

Columbia: The Business License Division maintains plumbing contractor records. Verification is available by contacting the division.

What to Verify

When checking a plumber's credentials, confirm the license level (apprentice, journeyman, master, or contractor), the issuing jurisdiction, whether the license is currently active (not expired or suspended), and whether the plumber holds the specific credential for the type of work being done.

A plumber licensed in St. Louis County is not automatically licensed in St. Louis City, Kansas City, or any other jurisdiction. If a contractor claims to be licensed "in Missouri," ask which specific cities or counties issued their trade cards.

For contractor-level work, also verify that the business carries active general liability insurance and a current surety bond. The contractor's bonding and insurance documentation should be on file with the local building department.

Why Verification Matters

Hiring an unlicensed plumber puts property owners at risk. Work performed by unlicensed tradespeople may not be covered by insurance if something goes wrong. Inspectors can issue stop-work orders on unpermitted jobs. And if unlicensed work causes code violations, the property owner — not the plumber — often bears the remediation cost.

Navigate Missouri's Licensing System

The Missouri Plumber License Guide includes contact information and portal links for every major Missouri licensing jurisdiction, along with a complete breakdown of what each trade card level authorizes.

See more Missouri guides →