There is no single number: a plumbing license takes as long as your state's supervised-experience rule, and the rules cited on this page run from Kentucky's 2 consecutive apprentice years to Alaska's 8,000 logged hours — with New Hampshire's apprenticeship program running the same 8,000.
The master license adds more where it exists.
Here is the timeline rung by rung, the ranges by state, and the school and military credit that can legally shorten it.
Apprentice to journeyman: the first license clock
Apprentice to journeyman is the first clock, and it runs on supervised hours, not calendar years.
There is no national number of hours — each licensing authority sets how much apprentice experience unlocks its journeyman exam.
Texas shows the rung in its simplest form: the Texas State Board of Plumbing Examiners (TSBPE) licenses plumbers statewide, and Journeyman Plumber is one of its four licenses, alongside Tradesman Plumber-Limited, Master Plumber and Plumbing Inspector.
Before anything else, start the clock.
In Texas, plumbing hours count toward the Tradesman or Journeyman exam only after the worker registers with TSBPE as a Plumber's Apprentice — registration requires age 16 or older and costs $15, renewing for $15 a year — and apprentice hours only accrue under direct supervision, with a TSBPE licensee on the job site at all times.
The fastest legal start is registering as early as your state allows and working under supervision from day one; unregistered hours may simply not count.
What the first stretch takes, in the states we can cite exactly:
- Kentucky — 2 consecutive years as an apprentice plumber, or 1 year plus a department-approved course.
- Michigan — at least 6,000 hours over at least 3 years as an actively registered plumbing apprentice under a licensed master or journey plumber.
- Arkansas — 4 years' experience (or the equivalent) before the journeyman plumber exam.
- New Hampshire — the plumbing apprenticeship itself is 8,000 hours (about 4 years) of on-the-job training plus 144 hours of related classroom instruction a year.
- Alaska — 8,000 hours of plumbing installation work logged while holding an Alaska Trainee certificate.
Pass the exam and the journeyman license is yours.
The hours, classroom time, exam formats and legal scope behind that rung are detailed in our journeyman plumber license guide.
These are each state's numbers, not the nation's
Journeyman to master: the second license clock
The second clock only exists where a master license exists.
As of September 29, 2026, 24 states run the classic apprentice → journeyman → master ladder at the state level.
Where the rung is real, the board sets the extra experience and the exam, and the stretch is measured in years, not months.
Arkansas makes the shape concrete: the master plumber exam requires 5 years' experience, and a journeyman must hold that license one full year before sitting the master exam — so at least one year of the journeyman-to-master stretch is spent holding the journeyman license by rule.
In other states the second clock never starts.
Five — Connecticut, Idaho, Indiana, Oklahoma and South Dakota — top the individual ladder at a contractor license instead of a master, and four — Alaska, New Mexico, Oregon and Washington — license at the journeyman level with no state master license.
There, the answer to "how long to master?" is that the state rung never arrives; the next step up is a business credential, not a master title.
And where a state issues no individual license at all, the license clock that matters is the contractor qualifier's.
A California C-36 Plumbing Contractor license needs a qualifier with at least 4 years of journey-level experience in the classification within the 10 years before applying.
An Arizona Registrar of Contractors qualifying party needs at least 4 years of practical or management trade experience, at least 2 of them within the last 10 years.
Arizona and California appear to have no individual worker license — the state licenses contractors only — though our research could not confirm that absence.
Where that contractor clock is the clock, it reads 4 years in both states.
State ranges: how the license timeline differs by state
Because the rungs differ, the timelines differ — how many license clocks stand between you and the top depends on which shape your state runs.
As of September 29, 2026:
- 24 states run the classic statewide apprentice → journeyman → master ladder — the two-clock timeline.
- 5 states — Connecticut, Idaho, Indiana, Oklahoma and South Dakota — stop the individual ladder at a contractor license.
- 4 states — Alaska, New Mexico, Oregon and Washington — license at the journeyman level with no master.
- 4 states have a statewide license with no journeyman rung at all: Illinois licenses apprentice then plumber, Delaware licenses masters only, New Jersey licenses masters while only registering journeymen, and North Carolina uses technician and contractor classes. In Illinois the first state license is the licensed apprentice plumber, and in Delaware it is the master plumber — the years between the rungs each board names are the board's own.
- 7 states — Florida, Kansas, Missouri, Nebraska, Nevada, New York and Wyoming — have no state plumber license; cities, counties or an industry board set the timeline instead.
- Ohio is a verified edge case: the state licenses plumbing contractors — the businesses — only, with no individual plumber license.
Other patches of the map stay unconfirmed in our research: Tennessee appears to have only a limited state plumber credential, with journeyman and master tiers handled locally; Pennsylvania appears to have no state plumber license, with cities and counties licensing instead; and Arizona, California, Mississippi and South Carolina appear to license contractors only.
Treat all of that as a question for the state agency, not an answer.
On the clocks we can read, the verified examples run from Kentucky's 2 consecutive apprentice years to Alaska's 8,000 hours logged while holding a Trainee certificate; New Hampshire's apprenticeship program runs the same 8,000 hours.
The full state-by-state map, with every jurisdiction's requirements, is on our plumbing license requirements page.
Credit for school or military: the fastest legal routes
School and military service can shorten the license clocks — where the licensing authority says so.
The credit is always the board's to give, and the verified examples look like this:
- Arizona — accredited technical training can count for up to 2 of the 4 years a Registrar of Contractors qualifying party needs.
- Alaska — of the 8,000 hours a journeyman applicant logs, up to 4,000 military or vocational hours and 1,000 classroom hours can count.
- South Dakota — military plumbing service earns one year of credit for every two years served, up to a maximum of five; its journeyman applicants otherwise need 4 years as an apprentice with at least 1,900 hours a year.
- Oklahoma — school hours can substitute for experience: a 1,000-hour approved program counts for 2 years of the 3 years of experience its journeyman exam applicants need.
Clocks can also expire.
Arizona counts qualifying experience only if at least 2 of the 4 years fall within the last 10 years, and California counts journey-level experience only within the 10 years before the application.
Hours logged a decade ago and abandoned may be worth nothing — one more reason to keep the clock running.
So the fastest way to become a licensed plumber is not a shortcut course; it is arithmetic.
Register as an apprentice at the earliest age your state allows — 16 in Texas, for a $15 fee — keep the supervised hours continuous, claim the school or military credit your board actually allows, and sit the exam when the hours clear.
We did not find any verified route to a plumbing license that beats that clock.
When you are ready to start logging hours, browse plumber jobs with contractors hiring now.
Career information, not legal or licensing advice. Requirements and credit rules are set by state boards — or the city or county office where licensing is local — and they change; confirm the current rules with your licensing authority before you act on anything here.