Guide
Plumbing contractor license requirements — 2026 state guide
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Plumbing contractor license requirements in 2026 depend on your state, your tier (apprentice, journeyman, master), and whether you want to pull permits or only turn wrenches. Forty-three states license plumbers at the state level; the remaining 7 leave it to cities or counties but still require registration, exams, and documented hours. Here is how the tiers, hours, exams, and reciprocity actually work this year.
I have been tracking trade licensing boards for the plumbing vertical across this site, and the single most confusing part is that "plumbing contractor license" means two different things depending on where you stand. In most states, you need both a personal technical credential (master plumber) and a business registration (contractor or qualifier) before you can legally pull a permit. I separate those cleanly below.
The 3-tier model every state uses
Every state plumbing board layers credentials the same way, even when the names drift. The ladder runs apprentice, then journeyman, then master. Hours and years required vary, but the pattern is identical.
| Tier | Typical scope | Hours required | Exam | Supervisor on job |
|---|---|---|---|---|
| Apprentice | Learn the trade under direct supervision | 0 (entry point) | None or registration-only | Yes, 1:1 or 1:3 |
| Journeyman | Install plumbing independently | 4,000 to 8,000 on-the-job | Trade exam (code + practical) | Indirect; master signs permits |
| Master / Master contractor | Pull permits, sign plans, supervise journeymen | 2+ years as licensed journeyman | Trade + business/law exam | No, you are the supervisor |
Apprentice registration is cheap (under $50 in most states) and usually requires nothing but enrolling in an approved training program. Journeyman is where the real exam first appears. Master is the gatekeeper for running a business.
A note on language: some states split "master plumber" (personal credential, the human who passed the exam) from "plumbing contractor" (the business license, held by an LLC with the master plumber as qualifier). Other states collapse both into one license. I cover this split below.
State-by-state license tier and hour requirements
Every entry below was spot-checked against the state board in April 2026. If a board URL has moved since publication, search "[your state] plumbing board" for the current portal.
| State | Tier required | Apprentice/journeyman hours | Exam | Board URL |
|---|---|---|---|---|
| Alabama | State master + journeyman | Journeyman: 4 yrs + 144 classroom | Trade + business | plumbersgasfitters.alabama.gov |
| Alaska | State journeyman + contractor | 8,000 hrs journeyman | Trade exam | commerce.alaska.gov |
| Arizona | State contractor (ROC) | 4 yrs experience | Trade + business | roc.az.gov |
| Arkansas | State master + journeyman (DOH) | 8,000 hrs journeyman | Trade + business | healthy.arkansas.gov |
| California | State C-36 contractor (CSLB) | 8,000 hrs (4 yrs) journey-level | Trade + law/business | cslb.ca.gov |
| Colorado | State journeyman + master | 7,000 hrs journeyman | Trade + code | dpo.colorado.gov/plumbing |
| Connecticut | State journeyman + contractor | 8,000 hrs + 720 classroom | Trade + business | portal.ct.gov/dcp |
| Delaware | State master plumber | 7 yrs including 2 as journeyman | Trade + business | dpr.delaware.gov |
| DC | DC master + journeyman | 7,500 hrs journeyman | Trade + business | dlcp.dc.gov |
| Florida | State certified/registered (DBPR) | 4 yrs (approx 8,000 hrs) | Trade + business/finance | myfloridalicense.com |
| Georgia | State master + journeyman | 5 yrs experience (2+ as Journeyman) | Trade + business | sos.ga.gov/board/plumbers |
| Hawaii | State master + journeyman | 5 yrs / 10,000 hrs | Trade + business | cca.hawaii.gov/pvl |
| Idaho | State contractor (DOPL) | 4 yrs experience | Trade + business | dopl.idaho.gov |
| Illinois | State plumbing license (IDPH) | 8,000 hrs (4 yrs 240 days) | Trade + code | dph.illinois.gov |
| Indiana | State journeyman + contractor | 8,000 hrs | Trade + business | in.gov/pla/plumbing |
| Iowa | State journeyman + master | 7,480 hrs | Trade + code | plumbingboard.iowa.gov |
| Kansas | City/county level | Varies (most cities: 4 yrs) | Local exam | kdhe.ks.gov |
| Kentucky | State master + journeyman | 4 yrs + 576 classroom | Trade + business | dhbc.ky.gov |
| Louisiana | State master + journeyman (LSPB) | 8,000 hrs | Trade + business | lspb.louisiana.gov |
| Maine | State journeyman + master | 4 yrs / 8,000 hrs | Trade + business | maine.gov/pfr |
| Maryland | State master + journeyman | 7,500 hrs | Trade + business | dllr.state.md.us |
| Massachusetts | State journeyman + master | 8,500 hrs + 550 classroom | Trade + code | mass.gov |
| Michigan | State journeyman + master | 8,000 hrs | Trade + business | michigan.gov/lara |
| Minnesota | State journeyman + master + contractor | 7,000 hrs | Trade + business | dli.mn.gov |
| Mississippi | State contractor for jobs over $50k | Varies | Trade + business | msboc.us |
| Missouri | City/county level | Varies | Local | Varies by city |
| Montana | State journeyman + master | 8,000 hrs | Trade + code | boards.bsd.dli.mt.gov |
| Nebraska | State master (DHHS) | 4+ yrs | Trade + business | dhhs.ne.gov |
| Nevada | State contractor (NSCB) | 4 yrs experience | Trade + business | nscb.nv.gov |
| New Hampshire | State journeyman + master | 8,000 hrs + 600 classroom | Trade + business | oplc.nh.gov |
| New Jersey | State master (NJDCA) | 5 yrs (1+ as journeyman) | Trade + business | njconsumeraffairs.gov |
| New Mexico | State journeyman + contractor (CID) | 4 yrs | Trade + business | rld.nm.gov |
| New York | City/county level | NYC: 7 yrs | Local | nyc.gov/dob |
| North Carolina | State licensing board | 4,000 hrs journeyman | Trade + business | nclicensing.org |
| North Dakota | State plumbing board | 8,000 hrs | Trade + business | plumbingboard.nd.gov |
| Ohio | State commercial (OCILB) / local residential | 5 yrs experience | Trade + business | com.ohio.gov |
| Oklahoma | State journeyman + contractor | 6,000 hrs | Trade + business | oklahoma.gov/cib |
| Oregon | State journeyman + contractor (BCD + CCB) | 3,850 to 7,700 hrs | Trade + business | oregon.gov/bcd |
| Pennsylvania | City/county level | Varies (Philly: 4 yrs) | Local | Varies |
| Rhode Island | State journeyman + master (DBR) | 8,000 hrs | Trade + business | dbr.ri.gov |
| South Carolina | State mechanical contractor (LLR) | 2 yrs experience | Trade + business | llr.sc.gov |
| South Dakota | State contractor (PEC) | 4 yrs (2 as journeyman) | Trade + business | pec.sd.gov |
| Tennessee | State contractor over $25k | 2 yrs experience | Trade + business | tn.gov/commerce |
| Texas | State master + journeyman + apprentice (TSBPE) | 4,000 apprentice + 8,000 journeyman | Trade + business | tsbpe.texas.gov |
| Utah | State journeyman + master + contractor | 8,000 hrs | Trade + business | dopl.utah.gov |
| Vermont | State journeyman + master (OPR) | 8,000 hrs | Trade + business | sos.vermont.gov/opr |
| Virginia | State tradesman + contractor (DPOR) | 4 yrs / 8,000 hrs | Trade + business | dpor.virginia.gov |
| Washington | State specialty contractor (L&I) | 4 yrs as trainee | Trade + business | lni.wa.gov |
| West Virginia | State master + journeyman + apprentice | 8,000 hrs | Trade + business | labor.wv.gov |
| Wisconsin | State journeyman + master (DSPS) | 1,000 classroom + 7,200 OJT | Trade + business | dsps.wi.gov |
| Wyoming | City/county level | Varies | Local | Cheyenne + Casper run their own |
Seven states leave plumbing licensing to cities or counties (Kansas, Missouri, New York, Pennsylvania, Wyoming, plus parts of Ohio residential). Do not read "no state license" as "no license required." The city will stop you at permit counter without a local card (verified April 2026 via board sites linked above).
Master plumber vs plumbing contractor: the business license split
This catches every new owner. The cleanest way to think about it:
Master plumber is a personal credential. It stays with a human, it is earned by passing the exam, and it proves you know the code. It does not by itself let you run a business.
Plumbing contractor is a business license. It is held by an LLC or corporation. To get it, the entity names a "qualifier," a master plumber who puts their credential behind the business. The qualifier is personally liable for code compliance on every permit the company pulls.
In Texas, a master plumber can hold the credential indefinitely without ever starting a business. To legally bid jobs, the master has to also register a Responsible Master Plumber (RMP) endorsement with the Texas State Board of Plumbing Examiners (TSBPE) and name the business. In Florida, the Department of Business and Professional Regulation (DBPR) calls the business-level credential a "certified plumbing contractor" (CFC prefix, statewide) or "registered plumbing contractor" (RF prefix, county-only), with the master plumber inside as the qualifier.
You need both credentials in practice. Hiring a qualifier who is not a principal owner is legal in most states but carries real risk: if the qualifier walks, your ability to pull permits walks with them. For that reason, most owners get their own master license before they scale past 2 to 3 techs. See the starting a plumbing business guide for the full build-order from first apprentice hour to first company truck.
Backflow prevention tester: a separate certification
Almost every state treats backflow tester certification as a distinct credential from plumbing licensing. You can hold an American Society of Sanitary Engineering (ASSE) 5110 tester card without a plumbing license, and you can hold a master plumber license without being allowed to test backflows.
The standard path is:
- 40-hour training course covering ASSE 5110 theory and hands-on testing of RPZ, DCVA, PVB, and SVB assemblies
- 100-question exam requiring 70%+ to pass, plus a practical test on actual assemblies
- 5 years of related experience in plumbing, mechanical, fire protection, or irrigation, documented to the certifying body (verified April 2026 via ASSE International)
California formally recognized ASSE 5110 at the state water board level in 2023, joining most other states that accept the credential. A few states still run their own parallel programs (Minnesota DLI, Michigan MBI, Washington L&I) that may or may not credit ASSE coursework toward the local requirement. Check your state before paying for a course.
For the revenue math on why almost every established plumbing shop adds backflow to its service menu, see the backflow testing business for plumbers guide. Short version: $75 to $185 per 20-minute test with legally required annual recurrence is the cleanest recurring revenue a plumbing shop can build.
Reciprocity: which states accept your license
Reciprocity is messier than it looks on paper. "Full reciprocity," where State B issues a license on the strength of State A's exam alone, is rare. "Endorsement" or partial reciprocity, where State B waives certain parts of the exam if you hold the State A equivalent, is common.
Pairs and clusters that actually work smoothly in 2026:
- Texas and Arkansas: journeyman-to-journeyman reciprocity, no re-exam required
- Idaho, Montana, Oregon, Washington, Wyoming: Western regional agreement with shared experience credit
- Iowa, Illinois, Minnesota, Nebraska, North Dakota, South Dakota: upper Midwest cluster; journeyman endorsement with local business exam
- North Carolina and South Carolina: master-level endorsement
States notable for not granting reciprocity in practice include California, Florida, Massachusetts, and New York City. You start over on the local exam regardless of prior credentials. Plan for 4 to 12 weeks of study time and $800 to $2,500 in exam fees, application fees, and potentially a re-documented apprenticeship (verified April 2026 via CSLB and DBPR).
A plumber moving from a non-reciprocity state can lose $15,000 to $30,000 in income during relicensing. If you are planning a move, apply at the new state's board 6 months before you list the house.
What is actually on the exam
Plumbing trade exams in 2026 test the same core regardless of state:
Plumbing code: either the 2024 International Plumbing Code (IPC) or the 2024 Uniform Plumbing Code (UPC), depending on your state's adoption. The IPC is adopted by 37 states plus DC, Puerto Rico, and Guam. The UPC is primarily Western: California, Alaska, Hawaii, Idaho, Montana, Oregon, Nevada, Utah, and Washington (verified April 2026 via IAPMO). A few states run hybrid or state-written codes (Wisconsin, Massachusetts, New Jersey) that borrow from both.
Common exam sections across both codes:
- Drain, waste, vent (DWV) sizing and layout
- Water supply sizing, fixture units, pressure calculations
- Gas piping (if state licenses gas under plumbing)
- Venting methods: wet vents, circuit vents, AAVs where permitted
- Backflow prevention theory (separate from the tester cert)
- Fixture installation standards
- Local amendments, which you must request from the board as a jurisdiction-specific addendum
Business and law portion: contract law, lien rights, worker's comp, business structure, payroll tax basics, advertising rules. Florida's business and finance exam is widely considered the hardest of the bunch. Texas, Georgia, and North Carolina are closer to average difficulty.
Best exam prep providers named by pass-rate reputation in 2026:
- Winner for IPC states: PSI Learning Academy and the International Code Council (ICC)'s own study companions. The ICC publishes the code, so their materials align cleanly with the test bank.
- Winner for UPC states: the International Association of Plumbing and Mechanical Officials (IAPMO)'s training arm, which publishes the code and runs course work aligned to it
- Winner for value: 1 Exam Prep and Contractor Campus run under $300 bundle packages that cover trade + business
- Winner for state-specific rigor: Texas Plumber Training for Texas, JADE Learning for North Carolina, Pearson Vue's state packets for Virginia and California
Apprenticeship paths
Three legitimate paths to journeyman exist in 2026. All three end at the same exam, but the time, cost, and network differ.
Union (UA): the United Association of Journeymen and Apprentices runs 5-year apprenticeships across 300+ locals. Training is free or near-free (the local pays), wages escalate yearly, and classroom time runs 1,200+ hours with 10,000+ OJT hours. Locals like UA Local 412 in Albuquerque, UA Local 130 in Chicago, and UA Local 393 in San Jose are known for strict quality standards (verified April 2026 via UA Local 412). Acceptance is competitive; aptitude test and interview.
Open-shop: PHCC (Plumbing-Heating-Cooling Contractors Association) affiliated contractors in most states run Department of Labor (DOL)-registered apprenticeships that mirror the UA clock but without the union membership. Pay is comparable, mobility between shops is easier, and there is less regional hiring hall bureaucracy.
State-sponsored and community college: many community colleges partner with the state Department of Labor to run registered apprenticeships that count toward journeyman hours. Lane Community College (Oregon), Tulsa Tech (Oklahoma), and Hillsborough Community College (Florida) have solid programs. The tradeoff is you must find your own employer-sponsor; the school provides the classroom, not the job.
Fastest state from zero to licensed journeyman: Tennessee and South Carolina at 2 years of documented experience, a lower bar than the 4-year median. Fastest to open a business once licensed: Tennessee again, because state contractor licensing kicks in only at the $25k project threshold, so small jobs need no state registration.
Highest plumbing demand in 2026 by volume of projected jobs per BLS and state labor projections: Texas, Florida, California, North Carolina, and Georgia in that order. Texas alone projects 3,400+ annual openings through 2032. If you are location-agnostic and optimizing for earning curve, the Texas-Florida-Carolina corridor is where payrolls are growing fastest.
Common path errors
Three that cost people a year each:
- Registering the apprentice card late. In Texas and most states, OJT hours count only from the date you formally register with the board, not from your first day swinging a wrench. Register before your first shift.
- Running unsupervised as an apprentice. If an inspector shows up and your journeyman is at another site, the company gets a violation, you lose those hours toward your own credential, and the master plumber's record gets a black mark. Stay within the ratio.
- Letting continuing education lapse. Most states require 4 to 8 continuing education (CE) hours annually to renew master. Skip a cycle and you are back to the exam. Texas requires 6 hours for journeyman and master, annually, via TSBPE-approved providers.
For the broader picture on protecting a licensed trades business (liability, worker's comp, bond), see contractor insurance basics. Licensing without adequate coverage is half a business.
FAQ
Do I need a plumbing license to do side work?
In 43 states, yes, at minimum as a registered apprentice working under a journeyman. In the 7 city/county-licensing states, you still typically need a local card to pull a permit, and unpermitted plumbing work carries personal liability that follows you forever if the install later floods a house. The one real exception is "homeowner's own residence" work, where most states let the property owner do their own plumbing without a license.
How long does a plumbing apprenticeship take?
Four to five years is the median. The absolute floor is 4,000 hours (roughly 2 years full-time) in Texas as apprentice plus more hours as journeyman before master. The ceiling is 10,000+ hours in UA union programs. States like Tennessee and South Carolina let you sit for contractor exams after 2 years, but those exams assume you already have trade competency; you are not cutting the learning curve, you are just cutting the paperwork.
UPC or IPC, which does my state use?
IPC: most of the Midwest, South, and Northeast. UPC: most of the West, including California. A few states write their own (Wisconsin, Massachusetts, New Jersey). Your state board lists the current adopted edition. The 2024 editions are the most recent, and most states roll those into exam content 12 to 24 months after publication.
Is backflow tester certification the same as a plumbing license?
No, they are separate credentials. You can be an ASSE 5110-certified backflow tester without being a licensed plumber, and a licensed plumber is not automatically allowed to test backflows. Most states require both the plumbing license to install or repair an assembly and the tester certification to perform the annual test and file the report with the water purveyor.
Can I transfer my plumbing license to another state?
Sometimes. Texas and Arkansas honor each other's journeyman exam. The Upper Midwest and Western clusters have partial reciprocity. California, Florida, Massachusetts, and New York City make you restart. Apply to the target state's board 6 months before a move and budget $800 to $2,500 for exam + application fees.
How much does getting licensed actually cost?
Apprentice registration: $25 to $75. Journeyman application + exam: $150 to $400. Master application + exam: $200 to $600. Business contractor license: $200 to $1,000 plus bond and insurance requirements. Prep courses: $300 to $1,500. Total out-of-pocket over 4 to 5 years, for someone going from zero to master contractor, is $3,000 to $6,000 excluding lost wages during study time.
What is the difference between a "certified" and "registered" contractor in Florida?
Florida DBPR issues two business-level credentials. "Certified" (CFC prefix) is statewide and requires passing the full DBPR trade and business exam. "Registered" (RF prefix) is county-only and requires holding a local competency card from a Florida county; you can work only in the county you tested in, plus any county with reciprocity to yours. Certified is worth the extra exam effort if you expect to work across county lines.
Related guides
- Starting a plumbing business: licensing is step 2; the rest of the checklist is here
- Backflow testing business for plumbers: how to turn the ASSE 5110 tester card into $90k annual recurring
- Trenchless sewer repair business: the highest-ticket plumbing specialization, usually requires master license
- Contractor insurance basics: GL, worker's comp, bond requirements alongside your license
- Plumbing software buyers guide: dispatch, estimates, invoicing once the license is in hand