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How to get a plumber license in Missouri

Hours, exam, fees, renewal and continuing education for Missouri plumbing licenses, pulled from official MO sources and checked .

Quick answer
  • Licensing body: No statewide plumber board: cities/counties license plumbers (RSMo Chapter 341)
  • State journeyman license: No (Missouri has no statewide plumber license. Political subdivisions license apprentices, journeymen and masters under Chapter 341 and local ordinances.)
  • Plumber license (local): Set by each city or county. RSMo 341.170 baseline for a journeyman plumber applicant: at least 21 years old and at least 5 years as an apprentice under a master plumber licensed under Chapter 341 (or under equal local laws). Master plumber applicants: at least 25 with 3+ years as a licensed journeyman under equal laws. Local boards may add exams and fees.
  • Exam: see below, via Set locally (city/county board of examiners)
  • Code edition: Local boards set exam references to their adopted plumbing code. Confirm with the city or county before you schedule.

Requirements by license

Plumber license (local)

ExperienceSet by each city or county. RSMo 341.170 baseline for a journeyman plumber applicant: at least 21 years old and at least 5 years as an apprentice under a master plumber licensed under Chapter 341 (or under equal local laws). Master plumber applicants: at least 25 with 3+ years as a licensed journeyman under equal laws. Local boards may add exams and fees.Source: revisor.mo.gov · as of
ExamSet locally (city/county board of examiners). Each jurisdiction runs or picks its own exam. City of St. Louis: Plumbers and Drainlayers Board of Examiners reviews applications and sets test content/passing scores.Source: stlouis-mo.gov · as of · Statute framework: revisor.mo.gov
FeesSet locally / not listedSource: stlouis-mo.gov · as of · Set by each city or county; see the local table. St. Louis City fee dollars were not listed on the Board overview page we checked.
RenewalSet locally. Ask the city or county that issued your card.Source: stlouis-mo.gov · as of
CE to renewSet locally. Not confirmed on the St. Louis Board overview page.Source: stlouis-mo.gov · as of

License types in Missouri

  • No statewide plumber license
  • Local apprentice / journeyman / master plumber (and drainlayer) licenses
  • Local business/contractor licenses as required
Source: revisor.mo.gov · as of

Local plumber licenses (by city)

Missouri has no state plumber license. Below is the City of St. Louis Board of Examiners. Elsewhere (Kansas City, St. Louis County, Springfield, etc.), ask the local plumbing board before you apply.

City of St. Louis

Office: Plumbers and Drainlayers Board of Examiners (Building Division)
Licenses journeymen?Yes
ExperienceBoard reviews qualifications for master plumbers, journeyman plumbers, drainlayers and apprentices under City ordinance (and Chapter 341 baselines). Confirm current experience hours with the Board before you apply.
ExamCity of St. Louis Board of Examiners. Board prescribes administration, form and content of licensing tests and passing grades
FeesNot confirmed
RenewalConfirm with Board. Confirm with Building Division / Board
CENot listed on the Board overview page we checked.
NotesBoard meets about monthly; contact Building Division for applications and exams.
Still openExact experience hours, exam fees and renewal dollars for City of St. Louis journeyman/master plumber
ContactBuilding Division / Plumbers and Drainlayers Board · (314) 622-3313 · dps-building-division@stlouis-mo.gov (source)
Source: stlouis-mo.gov · as of

Contact the city or county plumbing/building board for the job location.

Reciprocity (licensed in another state?)

No statewide plumber reciprocity today. Local boards set their own out-of-jurisdiction rules. Proposed legislation has discussed recognizing other Missouri political-subdivision plumber licenses that used a Division-approved exam — do not assume that is law until your city confirms.Source: revisor.mo.gov · as of

What we couldn't confirm yet

We only publish what we can tie to an official source. These items aren't published anywhere we could verify, so ask the office listed:

FAQ

Does Missouri have a state plumber license?

No. RSMo Chapter 341 has cities of 15,000+ license master and journeyman plumbers locally.

What experience does the statute describe for a journeyman?

At least 21 years old with 5 years as an apprentice under a qualified master plumber — local boards add exams and fees.

Already licensed? See Missouri plumber license renewal & CE requirements.

Other states

Compare every state side by side: license requirements by state · renewal & CE by state.