Arizona to Maryland: journeyman plumber license reciprocity

The Board's home page states that State plumber and natural-gas-fitter licenses are required throughout Maryland except (1) Baltimore County and (2) areas served by WSSC in Prince George's and Montgomery Counties; those two jurisdictions issue their own licenses and have their own plumbing code. Propane-gas-fitter certificates from the State Board are valid statewide, including those counties. Inbound plumbers who will work only in Montgomery or Prince George's County should apply to WSSC, not (or not only) to the State Board; work only in Baltimore County goes through Baltimore County. Work in the remaining counties and Baltimore City uses the State Board license. The reciprocal-license page states the Board may issue a State journey or master plumber license to a person already licensed by WSSC or Baltimore County if that person holds both plumbing and gas licenses obtained by examination.

How local licensing works. Arizona licenses plumbing contractors at the state level through the Registrar of Contractors and leaves individual tradesperson licensing to cities. The Registrar's classification page, application page and A.R.S. 32-1122 describe no journeyman, master or individual plumber licence; the state credential is a business contractor licence in the C-37, R-37 or CR-37 classification qualified by a named qualifying party. Phoenix is the only jurisdiction verified here that licenses individual plumbers.

Phoenix. The Planning and Development Department issues Journeyman licences in the Plumber and Gas Fitter, Mechanical, Gas Fitter, Mechanical and Gas Fitter, and combined Plumbing, Mechanical and Gas Fitter trades, plus Apprentice licences. A journeyman plumber applicant must first pass a journeyman exam at an approved testing site (Arizona Sheet Metal JATC in Phoenix for union and non-union candidates, or P.I.P.E. in Tempe for union members; $100 paid to the site; based on the 2024 Uniform Plumbing Code and 2024 International Fuel Gas Code, or the 2024 International Plumbing Code and 2024 IFGC), then apply in person or by mail to 438 W. Adams St. with proof of at least four years of experience in the trade (a United Association Journeyman Plumber, Fitter or Refrigeration Fitter union card, a Sheet Metal Workers union card, or a notarized statement on company letterhead signed by a company official), photo ID, the exam result and the $50 fee (paid within 60 days of the exam; $100 for the combined Plumbing, Mechanical and Gas Fitter card). The licence is valid three years and renews for $20 ($40 combined). An apprentice licence (one year, no exam) requires a notarized letter confirming current employment as a plumber, mechanical or gas fitter apprentice and work under a licensed journeyman or Arizona-licensed contractor at all times. The qualifying party of an ROC-licensed contractor does not need a journeyman licence to perform or observe work under the Phoenix code, and may optionally buy one for $50.

Other cities. Tucson, Mesa, Chandler, Scottsdale, Glendale, Tempe and other municipalities were not checked for this entry; a plumber should confirm local requirements before pulling permits outside Phoenix.

Out-of-state holders. Neither the Registrar of Contractors nor Phoenix recognizes an out-of-state journeyman plumber licence or exam. Phoenix's page and brochure contain no reciprocity or endorsement language: every applicant passes the local exam and documents four years of experience, although the experience letter may come from an out-of-state employer or a national union card. Outside Phoenix no personal licence is required to work for a licensed contractor. Documented out-of-state experience does count toward the four years of practical trade experience an ROC qualifying party needs to open a plumbing contracting business (see the master level).