Missouri Plumbing License: What Applies and What Does Not
What Missouri requires of a plumbing business in 2026, what the LLC has to file first, and where the license and the entity are two separate steps.
By Edmond Hui · Last updated: September 2026
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Missouri plumbing licensing at a glance
| State credential required for this work? | Varies by locality or specialty |
| Must the business itself be licensed? | Set by whoever issues it locally |
Does a plumbing business need a license in Missouri?
Missouri runs no single statewide license covering every plumbing business. What applies depends on the work and where you do it.
Missouri operates no statewide plumbing licensing scheme. Missouri law requires a plumber's certificate in cities and towns of 15,000 or more inhabitants and in counties of the first classification, where a local board of examiners conducts the examination and issues master plumber, journeyman plumber and drainlayer licenses. What applies elsewhere is set by the city or county.
Where Missouri does license this work, the credential is issued to a qualified individual. Whether the business must also register is set by whoever issues it.
Missouri issues no state plumbing license to a company, because it issues none to an individual either. Any company requirement comes from the city or county that has adopted plumbing licensing.
This records what Missouri publishes, not a determination about your business. Scope, thresholds and local requirements are set by the issuing body, so confirm with them before you bid or file.
Verified 2026-09-03 against the primary source listed under Sources.
What the LLC has to do first
Several states license the plumbing company separately from the individual plumber, so the LLC and the license are two filings, not one.
The entity filing is separate from anything the license requires. In Missouri it is made with the Missouri Secretary of State. File directly with the state here. The order matters wherever the license is issued to the company rather than to a person: the entity has to exist before an application can name it.
Forming an LLC as a plumbing business in Missouri covers the filing itself, step by step.
Insurance Missouri plumbers are asked to show
Plumbing license and registration schemes commonly require proof of general liability cover, and water damage from a failed connection is the claim these policies are bought for.
We do not publish Missouri premium figures for this trade, so nothing here is a quote. Our business insurance guide for plumbers covers what each policy does and does not pay for.
This guide is general information, not legal or tax advice, and reading it does not create an attorney-client relationship. It reports what each state licensing board publishes for this trade, with the sources this page cites. It cannot tell you whether your own work needs a licence: that turns on the scope of the job, the value of the contract, and the city or county you work in, which commonly adds its own registration on top of the state's. Confirm your own position with the board named on this page and with your local building or business licensing office before you bid or start work.
Frequently Asked Questions
Sources
2 documents
Each entry below is a document recorded in our verified Missouri sources, and each entry says what the document is. Some statutory text is read from an accurate mirror rather than from the state's own host, and those say so. Where we hold the citation but no stable public link, the citation is printed on its own rather than pointed at a guessed address.
- revisor.mo.gov/main/OneSection.aspx?section=341.010Missouri plumbers licensing, primary source: Section 341.010, Plumbers must have certificates, Missouri Revisor of Statutes (verified 2026-09-03)
- Missouri statute: Chapter 341 of the Revised Statutes (local plumber certificates)
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Edmond Hui · Founder, MyStateLLC
Edmond Hui is a software engineer and serial entrepreneur based in New York who has founded multiple online businesses across e-commerce, media, and information publishing. Before transitioning into tech, he spent years as a commercial real estate professional closing deals totaling over 100,000 square feet, giving him firsthand experience with business formation and entity structuring. He built MyStateLLC to provide the free, state-specific LLC guidance he wished existed when forming his own companies.