Does Wyoming Require a Plumbing License? Who Licenses Plumbers Instead

No. As of our September 2026 review, Wyoming has no state plumber license: the state's trade licensing agency, the Wyoming Department of Fire Prevention and Electrical Safety (the State Fire Marshal's office), licenses electricians and runs no plumbing or HVAC license program.

Plumbing licensing instead happens city by city.

Casper issues its own individual plumbing licenses, and Cheyenne licenses plumbers through its Contractor Licensing Board, which sets the examination requirements for its plumbing and mechanical licenses.

The license you need, and the steps to get it, therefore depend on the city where the work is done; confirm with that city's building or licensing department before you take paid plumbing work.

There are no state levels; the rungs are city licenses.

Casper's individual licenses include Apprentice Plumber, Journeyman Plumber and Master Plumber, plus Gas Utility Installer and a Plumbing Contractor license for businesses.

The apprentice license is issued to the employing contractor in the apprentice's name and is valid only while the apprentice works for that contractor.

The Plumbing Contractor license is the business rung: the firm must possess or employ a full-time licensed master plumber.

Our research documents the exam and experience requirements each level requires, but not a written scope-of-practice difference between them; the city's licensing office can say exactly what each license permits.

In Casper, journeyman and master plumber applicants each need an approved ICC exam (G27-N or G28-N, or the equivalent) and either a federally recognized plumbing apprenticeship or four years in a Casper-licensed shop; a Master Plumber additionally needs five years as a journeyman or master in a Casper-licensed shop.

Casper's fee table lists apprentice $3, journeyman $25, master $75 and mechanical/plumbing contractor $300 in its first column; the table's second column is unlabeled in the copy we reviewed, so ask the city which fee applies to you.

In Cheyenne, a journeyman-level craft license requires at least 4 years / 8,000 hours of documented experience as a licensed apprentice, or certified equivalent training, plus a satisfactory exam, with journeyman fees of $50 application, $30 initial and $15 renewal, and master/qualified supervisor fees of $50, $50 and $25.

Casper requires an approved ICC exam for both of its plumber licenses: G27-N or G28-N, or an equivalent, with the Master Plumber requirement naming ICC G27-N specifically.

In Cheyenne, the Contractor Licensing Board determines the examinations for plumbing and mechanical licenses, and its regulations name ICC, the City, NICET and others as administrators.

Our research did not collect the content outline for either city's exam, so get the current exam list and booking steps from the licensing office where you will test.

The clearest renewal rule our research found is Cheyenne's: licenses under its Contractor Licensing Board renew annually, with journeyman fees of $50 application, $30 initial and $15 renewal, and master/qualified supervisor fees of $50, $50 and $25.

Our research did not confirm Casper's renewal cycle or renewal fee.

We also found no continuing-education hours stated for either city's plumbing licenses; that is an absence in our research, not a confirmed exemption, so ask the city that issued your license what renewal and CE it requires.

Wyoming has no state plumbing license for another state's license to transfer into: the Department of Fire Prevention and Electrical Safety runs no plumbing program, and licensing is a city matter.

Any recognition of an out-of-state license is therefore decided by whichever city issues the license you would work under.

Our research did not surface any reciprocity or recognition agreement covering plumbing licenses, either between Wyoming cities or between a Wyoming city and other states, so ask the city where you plan to work how it treats your out-of-state license.

There is no statewide license lookup in Wyoming, because there is no statewide license: records sit with the city that issued the credential.

Casper's Building and Inspections division publishes its contractor licensing requirements, including the individual plumber licenses, on its website, and Cheyenne's Contractor Licensing Board keeps its own records.

Before you hire a plumber or take work from a contractor, contact the building or licensing department of the city where the job is done and confirm the license directly.

Cities license plumbers in Wyoming.

Casper issues Apprentice Plumber, Journeyman Plumber, Master Plumber, Gas Utility Installer and Plumbing Contractor licenses through its Building and Inspections contractor licensing.

Cheyenne licenses plumbers through its Contractor Licensing Board, which also sets the exams for its plumbing and mechanical licenses.

Our research did not confirm plumbing license programs in Laramie, Gillette or Rock Springs; those cities may or may not issue their own licenses, so check with the building or licensing department where the work will be done.

Casper issues a separate Gas Utility Installer license alongside its plumber licenses; our research did not collect what that license covers or requires.

Beyond that, our research did not surface a separate gas-fitter credential in another Wyoming city, nor any statewide backflow certification requirement for plumbers.

If a project involves gas piping or backflow prevention, ask the city where the work is done, and the water utility if one is involved, what certification it requires.