State licensing boards · verified July 2026
How many hours does it take to become a journeyman plumber?
The short answer
As of July 2026, 8,000 hours of supervised on-the-job training is the most common requirement for a journeyman plumber license, used by 9 of the 21 states that publish an explicit hour figure. The full published range runs from 4,000 hours in Maine to 12,000 hours in 2 states. At a 40-hour week that is roughly 2 to 6 years of full-time work.
Journeyman plumber hour requirements in every state
Every figure below comes from the state licensing board's own published rules or statute, with the source linked in the last column and the date it was checked. Where a state sets a classroom requirement in addition to on-the-job hours, both appear.
Source: individual state licensing boards, statutes and administrative rules. Each figure was read from the official source and last verified in July 2026.
Why 29 states publish no hour figure
A blank is not missing research. Most states that do not publish an hour count genuinely do not set one, and the reason differs by state.
- 24 states license the trade but set the requirement in years of experience, or only license at the contractor level rather than certifying individual journeymen: Alabama, Arizona, Arkansas, California, Delaware, Georgia, Illinois, Indiana, Iowa, Kentucky, Mississippi, Nevada and 12 more.
- 6 states leave licensing to cities and counties, so there is no statewide figure to publish: Kansas, Missouri, Nebraska, New York, Pennsylvania, Wyoming. In these states the requirement is set by the municipality you work in.
Which state has the lowest hour requirement?
Maine alone sets the lowest published on-the-job requirement at 4,000 hours, about 2 years of full-time work. The longest is 2 states at 12,000 hours. Hours are only part of the cost of entry: the exam, the fee schedule and the renewal cycle differ too, and a state with fewer required hours can still be slower to license in practice if its board processes applications on a fixed calendar. Price the whole path with the license cost estimator.
Do classroom hours count toward the total?
They are counted separately in most states. Of the 21 states publishing an on-the-job figure, 7 also set a classroom requirement on top of it, shown in the table above. Several states allow approved schooling to substitute for a capped portion of on-the-job hours, which is a different rule from adding classroom time — the state page for each state states which applies.
Do hours transfer between states?
Hours generally do not transfer directly; a license does, and only where the two states have a formal reciprocity agreement. 10 of the 50 states publish at least one reciprocity agreement for this trade, and California publishes the most at 5 states. Agreements are usually conditional on holding the out-of-state license for a minimum period and having passed an equivalent exam, so check the specific agreement rather than assuming a listed state accepts your credential automatically.
Related comparisons for this trade
- Which states accept a plumber license from where, taken from each board's own list
- Plumbers pay and outlook
- License cost estimator for a state-by-state fee breakdown
How these figures were compiled
Each state record was researched from that state's own licensing board, statute or administrative rules, with at least one official source URL stored per record. Records whose sources were ambiguous or unreachable were re-verified independently a second time before publication, and any that remained unclear are held back rather than guessed at. The full process, including what we refuse to publish, is on the methodology page. Corrections are published on the corrections page.
Sources and verification
- State licensing boards, statutes and administrative rules for all 50 states, linked per state in the table above.
- Each record carries its own source URLs and verification date; see the state pages for the full per-fact citations.
Last verified July 2026 · 50 state records · Found an error? Report it and it will be corrected and logged.
Licensing requirements change between our verification sweeps. This page is informational only, so confirm current requirements with the state board linked for your state before making decisions. Not legal advice.