Does Missouri Require a Plumbing License? Who Licenses Plumbers Instead

No. The Missouri Division of Professional Registration's list of state licensing boards includes Electrical Contractors but no plumbing, mechanical or HVAC board, so there is no statewide plumber credential to apply for.

The licenses that matter are issued where you work: Kansas City and St. Louis County both run their own plumbing licensing.

Because the state issues no plumbing license, there are no state-level hour totals, fees or exams to meet.

The levels are local, not state.

Kansas City issues Journeyman Plumber and Master Plumber certifications, which the city requires for individuals performing or supervising plumbing work in the city.

St. Louis County licenses journeyman and master plumbers through its Department of Transportation and Public Works plumbing licensing office.

For the business side, Kansas City sequences contractor licensing: a business license, then an individual Certificate of Qualification in the trade, then a Contractor License for the business.

Because licensing is local, what each credential allows is set by the city or county that issues it — confirm with the local office where you will work.

Our research did not capture the qualification requirements — ages, experience hours, fees or documents — for Kansas City's or St. Louis County's plumbing credentials, so we cannot state them here.

What the research does establish is structural: in Kansas City, contractor licensing runs from a business license through an individual Certificate of Qualification to a Contractor License for the business, and the city requires its plumbing certifications for people performing or supervising plumbing work.

St. Louis County's plumbing licensing page covers the documents, information and qualification requirements for becoming a journeyman or master plumber.

Treat any hour total or fee quoted for a Missouri state plumbing license with caution: Missouri has no state plumbing license, so any such figure cannot be a state requirement — check it against the city or county office where you would apply.

Ask the Permits Division in Kansas City or the county plumbing office for the current requirements.

There is no state plumbing exam, because Missouri issues no state plumbing license.

Kansas City and St. Louis County credential plumbers for their own jurisdictions, but our research did not capture whether either certification process includes an exam, which vendor would administer it, or what it covers.

Ask the office where you apply for the current candidate information before you schedule anything.

Missouri has no state plumbing license, so there is no state renewal cycle and no state continuing-education requirement for plumbers.

Renewal is local: the City Planning & Development Department's Permits Division administers contractor licensing, certification, registration and renewals within Kansas City, and St. Louis County licenses plumbers through its Department of Transportation and Public Works plumbing licensing office.

Our research did not capture either jurisdiction's renewal period or CE hours for plumbers, so confirm both with the office that issued your credential before you count on a number.

Missouri has no state plumbing license for another state to reciprocate with, and our research did not find any reciprocity agreements covering Missouri plumbing credentials.

Whether Kansas City accepts a license from St. Louis County — or from another state entirely — is a question for the office that would issue your credential, and our research did not capture those local rules.

If you hold a journeyman or master plumber credential elsewhere, ask the Kansas City Permits Division or the St. Louis County plumbing office directly what it accepts before you assume anything.

There is no statewide Missouri plumbing license lookup, because there is no statewide license — licensing is local, so you check with the city or county.

Kansas City's Permits Division page at bizcare.kcmo.gov/contractor-licensing covers the city's contractor licensing and certifications, and our research notes St. Louis County lists licensed master plumbers on stlouiscountymo.gov.

If you are hiring, or working for, someone claiming a local credential, ask that office to confirm it.

Two local systems anchor what the research confirmed.

In Kansas City, the City Planning & Development Department's Permits Division administers contractor licensing, certification, registration and renewals, in a sequence that runs from a business license to an individual Certificate of Qualification to a Contractor License for the business, and it issues Journeyman Plumber and Master Plumber certifications.

In St. Louis County, the Department of Transportation and Public Works plumbing licensing office licenses journeyman and master plumbers and issues backflow tester certificates.

Cities and counties elsewhere in Missouri set their own rules — confirm with the building or licensing department where the work will be done.

Backflow testing is credentialed locally, like the rest of Missouri plumbing licensing.

St. Louis County's plumbing licensing office issues backflow (BFD) tester certificates alongside its journeyman and master plumber licenses.

Our research did not capture backflow tester requirements in Kansas City or elsewhere in Missouri, and it did not cover gas-fitting credentials for plumbers — ask the local plumbing office what a backflow or gas job requires where you work.