Tennessee to North Dakota: master plumber license reciprocity

North Dakota issues a statewide Master Plumber certificate and license through the North Dakota State Plumbing Board under NDCC chapter 43-18 and NDAC chapter 62-02-01. Any firm installing plumbing where there is a public water or sewer system must have a licensed master plumber in charge (NDCC 43-18-10). A new applicant must be at least 21 and have two years and 3,400 hours of experience 'as a journeyman plumber licensed by the state of North Dakota or any other state that has a state licensing law', then pass the board-administered master exam - four parts, one closed book and three open book, five hours, on the 2018 North Dakota Plumbing Code - with 80%. Fees are a $50 application fee, a $50 exam fee and a $200 master license fee; licenses expire every December 31 and renew for $200, with 2 to 4 hours of continuing education required in each two-year period. A master may also hold the journeyman license without paying the journeyman fee. Masters from Minnesota (license held one year) and South Dakota Contractor licensees may be licensed without examination under the Board's written agreements; other out-of-state masters apply for the North Dakota master examination with their journeyman or master license vouched for.

Tennessee does not issue a master plumber license. The state-level plumbing credentials are (1) the Limited Licensed Plumber (LLP), a personal license for work under $25,000 where the Division of Fire Prevention inspects, which the Board does not treat as a master equivalent and for which it has no exam-waiver agreements, and (2) a contractor license with the CMC-A (plumbing) or CMC (full mechanical: plumbing and HVAC) classification, issued to a business that names a qualifying agent and required for plumbing projects of $25,000 or more. CMC-A and CMC candidates need Board pre-approval ($50) before the plumbing or full-mechanical trade exam; every contractor also takes the Tennessee Business and Law exam (Prov from 2026-07-01; scores typically valid two years). Initial contractor application fee $250. The Board's trade-exam-waiver form lets a contractor whose origin board verifies a comparable plumbing or mechanical exam skip the Tennessee trade exam but not Business and Law, and it cannot be used for the LLP: Ohio plumbing maps to CMC-A, South Carolina plumbing to CMC-A, and Louisiana, Mississippi and West Virginia mechanical licenses to CMC. That waiver is contractor-to-contractor only (Ohio's OCILB listing of Tennessee as a plumbing-contractor partner is the same relationship from Ohio's side). Master plumber licenses proper exist only locally; Nashville's MPE Board issues a master plumber certificate. An out-of-state master plumber has no statewide personal recognition: to contract for $25,000 or more they need the CMC-A or CMC contractor license; to pull small-job permits they need the LLP where it is accepted, or the local master card where it is not.