Code Stories · why the rule exists
Licensing: Why Massachusetts Licenses Plumbers (and Why Apprenticeship Hours)
The rule in Massachusetts today
Journeyman (apprentice licensed on/after 9/1/2008): 6,800 clock hours of experience and 550 clock hours of theory; before 9/1/2008: 8,000 and 300; 12 CE hours per 2-year renewal; 70% to pass each exam part (facts.json).
- Journeyman (apprentice licensed on/after 9/1/2008): 6,800 clock hours experience (248 CMR 11.02(1)(b))
- Journeyman (on/after 9/1/2008): 550 clock hours theory (248 CMR 11.02(1)(b))
- Journeyman (apprentice licensed before 9/1/2008): 8,000 clock hours experience (248 CMR 11.02(1)(a))
- Journeyman (before 9/1/2008): 300 clock hours theory (248 CMR 11.02(1)(a))
- No more than 165 theory hours per calendar year; at least four years (248 CMR 11.02(1))
- Each theory tier is 110 hours (five tiers = 550) (248 CMR 11.02)
- Vocational graduates: up to the first three tiers (330 hours) credited (248 CMR 11.02)
- Journeyman continuing education: 12 hours per 2-year renewal (248 CMR 11.04)
- Pass mark 70% on each part (PSI bulletin 598)
Why it exists
Plumbing mistakes are mostly invisible, often buried in walls, and tend to show up later as disease, poisoning, scalding, explosion or flooding, frequently in someone else's home. The customer cannot judge the work, so the state tests the worker. Massachusetts' early law defined a qualified 'practical plumber' by time served learning under a journeyman, and required a written, oral and practical exam. That structure survives in today's apprenticeship-hours-plus-exam model. The Board was originally set up to include a sanitary expert, which shows the law treated plumbing as a public-health job, not just a building trade.
How it came to be
- 1893 — Licensing predates the state board. The law as printed in 1916 exempts only those already plumbing before July 10, 1893. archive.org
- pre-1909 — The statute defines a 'practical plumber' by apprenticeship time. archive.org
- 1909 — Acts of 1909, chapter 536 (approved June 19, 1909) creates the State Examiners of Plumbers, appointed by the State Board of Health. archive.org
- 1916 — Early exam rules: minimum service time, three-part exam, 70% to pass. archive.org
- 1916 — The same rules say examinations 'shall consist of tests in written, oral and practical plumbing' and that masters need three years as journeymen. archive.org
Make it stick
True: when Massachusetts created its state plumbing examiners in 1909, one of the three seats had to be filled by a 'sanitary expert.' From the start, the state treated a plumbing license as a public-health credential.
On the exam
The journeyman exam is more likely to test current licensing law than history. Know the current numbers: 6,800 clock hours of apprentice work experience and 550 hours of theory (five 110-hour tiers) for apprentices licensed on or after 9/1/2008 (8,000 and 300 before then); no more than 165 theory hours per calendar year; vocational graduates may be credited up to 330 hours; 12 hours of continuing education per 2-year renewal; PSI pass mark 70% on each part (248 CMR 11.02, 11.04; PSI bulletin 598). Also know who may do what work (apprentice supervision, journeyman vs. master) and permits. The 70% pass mark of 1916 survives today.
What people get wrong
- Massachusetts plumbing licensing started with the state board in 1909. Local licensing and examination existed earlier. The statute's grandfather date is July 10, 1893. The 1909 act created the State Examiners.
- The early board also supervised and inspected plumbing. The 1916 notice says the State Examiners 'have to do with the licensing of plumbers only'. Supervision and inspection were local.
- Apprenticeship hours are a union or guild tradition, not a legal safety requirement. In Massachusetts they were written into statute: the 'practical plumber' was defined by apprenticeship time (Revised Laws c.103).
Try it: 3 real practice questions
Q1. How many clock hours of licensed apprentice work experience are required to qualify for the MA journeyman plumber exam?
Per 248 CMR 11.02, an applicant must document no less than 6,800 clock hours of practical work experience as a licensed apprentice, under the direct supervision of a Massachusetts licensed journeyman or master plumber. That is four years at the required pace: each year an apprentice earns 165 education hours (1½ tiers) must be paired with 1,700 clock hours of qualifying work experience — 4 × 1,700 = 6,800. (The 8,000-hour figure is the older standard that applied to apprentices licensed before September 1, 2008.)
248 CMR 11.02Q2. How many total clock hours of tier education are required for journeyman licensure in Massachusetts?
The Board-approved tier program totals 550 clock hours — five tiers of 110 hours each (Tiers 1 through 5) — completed alongside the required apprentice work experience.
248 CMR 11.02Q3. A plumbing apprentice in Massachusetts must be:
The apprentice license (registration) lets the Board track an apprentice's hours and education toward licensure, and the apprentice may work only under the direct supervision of a Massachusetts licensed plumber. Supervision by a general contractor or construction supervisor does not count, because only plumbing licensees are responsible for plumbing work under 248 CMR.
248 CMR 3.03(2); 248 CMR 11.02These come from the PressureTest bank. Start 7 days free for the full bank, timed exam simulations and drawn isometric problems.