How Do You Get a Plumbing License in Oklahoma?

Yes.

Oklahoma licenses plumbers statewide through the Construction Industries Board (CIB) under the Oklahoma Plumbing License Law of 1955.

The CIB issues three kinds of plumbing credential: the registered apprentice, the journeyman plumber and the plumbing contractor, each offered as an unlimited or a residential license.

Contracting the work takes the contractor license — see the ladder below — and the employer-side detail lives in our plumbing contractor license by state guide.

Fees and forms change, so check with the CIB before you apply.

The CIB's ladder runs registered apprentice, journeyman plumber and plumbing contractor, each in an unlimited and a residential version.

A journeyman plumber must be employed by and work under a licensed plumbing contractor, and the rule is explicit: a journeyman shall not contract or furnish labor and materials.

Oklahoma issues no master plumber license — the individual ladder tops out at journeyman, and contracting is its own license.

One scope note: medical gas is a mechanical journeyman category in Oklahoma, not a plumbing one, so it does not come with a plumbing license.

Experience is the gate to the journeyman exam: you must be 18 and have three years of plumbing experience while employed by a licensed plumbing contractor, and approved schooling substitutes — the rules give a 1,000-hour program as counting for two years.

Hours count only if you registered with the CIB as an apprentice for work done in Oklahoma, with each year's registration signed by your licensed contractor or an approved school instructor; one licensed plumber may supervise up to three apprentice plumbers.

Fees under the CIB plumbing rules effective October 1, 2024: apprentice application $5 plus $20 registration; journeyman application $25, initial license $50, renewal $75.

The contractor license takes the journeyman requirements plus one extra year and a pass on both the business-and-law and trade portions; its bond, insurance and fee schedule sit on the contractor rung of the ladder above and the employer-side guide.

The rules we read do not say whether one plumbing contractor licensee may qualify more than one firm — the one-firm rule our research confirmed is stated for mechanical licenses — so ask the CIB.

Oklahoma's plumbing exams are scored by part: an examinee must make 75% or more on each part to pass.

Applicants for the contractor exam must also take and pass the Oklahoma business-and-law section.

On the vendor, the CIB's career-pathways material names PSI as its testing vendor, says the journeyman test is open book, and points the trade exams at the statewide codes adopted by the Oklahoma Uniform Building Code Commission (OUBCC) — but those statements are about the CIB's mechanical licenses, and the plumbing rules we read name no plumbing exam vendor, so confirm the plumbing exam's vendor and format with the CIB.

The retest waits we confirmed are stated for the mechanical exams too: 30 days after a first failure and 90 days after later failures; ask the CIB what applies to plumbing retests.

Oklahoma plumbing licenses are annual: a license lasts up to one year and expires on the last day of the licensee's birth month, so your renewal date follows your birthday.

The journeyman renewal fee is $75.

Before renewal, journeymen and contractors need six hours of approved continuing education every three years (36 months) preceding the license expiration date.

Because the fee schedule and the CE rule both live in the CIB's plumbing rules, confirm both with the CIB close to your renewal date.

The Oklahoma CIB signed a multi-year plumbing reciprocity agreement with the Arkansas Committee of Plumbing Examiners effective October 21, 2024.

As the CIB describes it, a licensed plumber who has held the license for at least one year and passed a state exam can get an unlimited Oklahoma journeyman license without taking the journeyman test — but it is not automatic.

Mind the direction of the paperwork: the agreement comes from the Oklahoma CIB, and Arkansas's own licensing pages do not mention it, so check with both boards before you rely on it.

Plumbers from states with no Oklahoma reciprocity agreement may apply for exam equivalency if the Board has approved their jurisdiction's exam, and contractor applicants still take and pass the Oklahoma business-and-law section.

The CIB's public check is the 'Are They Licensed' search at cibverify.ok.gov.

Our research took that address from the CIB site's own navigation and did not open the search page itself, so we did not confirm its coverage — treat it as the starting point and confirm anything that matters with the CIB directly.

Search it before you take a job with a contractor who says their license covers your work, and before you hire anyone under your own license.

Natural gas piping is one of the CIB's mechanical license categories, listed alongside HVAC, refrigeration, process piping and sheet metal.

Our research confirms gas piping as a mechanical category but does not settle whether it also falls within an Oklahoma plumbing license, so ask the CIB what your license covers before you take gas work.

Medical gas is a mechanical (not plumbing) journeyman category, and it requires certification under the current NFPA 99 standard or an approved medical gas certification.

The Oklahoma licensing documents we worked from do not describe a separate backflow credential for plumbers, so ask the CIB and the water utility or permit office where the work is done what they require before you take backflow work.