The short version: Cincinnati sits on a state line, and the two states run plumbing licenses completely differently. Ohio licenses you as a contractor through the state board — there is no state journeyman license at all. Kentucky licenses you personally as a journeyman or master plumber, statewide. If you run crews or bid work on both sides of the river, you probably need both credentials, and they do not automatically transfer. Here's what each one takes.
Ohio: no state journeyman license — the contractor license is the credential#
This is the part that trips people up. As one veteran on a trade forum put it: Ohio does not issue a state journeyman plumber license. Journeyman cards exist at the local level (cities, unions), but the state credential is a plumbing contractor license issued by the Ohio Construction Industry Licensing Board (OCILB), under the Ohio Department of Commerce's Division of Industrial Compliance.
What it takes, per the board's published requirements:
- Five years of experience in the trade, documented on permitted projects. You work under a licensed contractor; sewer service, water service, gas service, and drain cleaning don't count toward the five years.
- Paperwork proving it. A September 2024 rule change made this easier: you submit W-2s (or Schedule Cs) showing five years in the trade, plus one of four things — five years of building permits, a journeyman's card from a local city, union, or another state, an Ohio- or U.S. Department of Labor-approved apprenticeship completion certificate, or 40 hours of OCILB-approved code continuing education.
- Two exams: the trade exam plus a Business and Law exam.
- Insurance: proof of at least $500,000 in contractor liability coverage.
- Fees: a $25 application fee and a $25 exam fee.
One interesting wrinkle for Kentucky-side techs: since a "journeyman's card issued by a foreign state" is now explicitly one of the accepted experience paths, a Kentucky journeyman license may help you document the five years Ohio wants. Verify it with the board before banking on it, but the rule language is there.
Renewal is annual: the board's testimony to the state legislature puts renewal at $60 a year with 8 hours of continuing education. Fees change, so confirm current numbers on the board's application page before you budget — but that's the ballpark.
Kentucky: journeyman and master, licensed statewide#
Cross the river and the model flips. Kentucky's Division of Plumbing — part of the Department of Housing, Buildings and Construction — licenses individuals as journeyman or master plumbers under KRS Chapter 318, and the license is good anywhere in the state.
Journeyman plumber:
- At least 18 years old, of good moral character.
- At least two consecutive years working as an apprentice plumber (per 815 KAR 20:030), or a department-approved plumbing course plus one year of apprentice experience.
- Pass the state journeyman exam.
- The state's legislative review lists a $50 application fee.
Master plumber:
- Pass the master exam with at least 80% on each portion (that's per the regulation, not a rumor — 815 KAR 20:030 sets the bar).
- $250 license fee.
- Carry at least $250,000 in general liability insurance, plus proof of workers' comp and unemployment insurance compliance.
- Master is the credential that lets you pull permits and take responsible charge of journeymen. In Kentucky, plumbing work other than a homeowner's own permit must be done by a licensed master, or by a licensed journeyman under a master's supervision.
Both licenses expire on the last day of your birth month, every year, and renewal requires the Kentucky plumbing continuing-education course. Budget for it like a subscription — it's annual, not optional.
The reciprocity question: Ohio and Kentucky do talk — but verify plumbing specifically#
Ohio law (Ohio Revised Code 4740.08) lets the board issue a license without examination to someone licensed in another state when a written reciprocity agreement exists and the other state's requirements are substantially equal. And in testimony to the Ohio legislature, the OCILB has said it holds reciprocity agreements with six states — including Kentucky.
Here's the catch worth knowing before you act on it: the reciprocity verification form currently posted by Ohio's board for Kentucky lists electrical, HVAC, and refrigeration license types. There is no plumbing checkbox on that form. That doesn't prove plumbing reciprocity is dead — but it means you should not assume your Kentucky master license converts to an Ohio contractor license without a phone call to the board first. The agreement exists at the board level; whether plumbing is covered today is a question for OCILB directly at 614-644-3493.
For a lead tech, the practical reading is this: reciprocity might save you the Ohio exam, but plan as though you'll sit for it. If it works out, it's a bonus.
The Cincinnati wrinkle: the state license may not be the only license#
One more layer. Ohio's system is layered — the state contractor license sits alongside local requirements. Cincinnati-area public work has required both: a Cincinnati housing authority RFP for plumbing services explicitly required contractors to hold the licenses required by both the State of Ohio and the City of Cincinnati, with licensed, trained employees on staff. The takeaway for lead techs and shops: when you bid or staff a job, check the city or county, not just the state. On the Kentucky side, the state license covers you statewide, which is simpler — but individual project specs can still add requirements.
What this means for a lead tech weighing a move or a shop staffing both sides#
If you're a senior tech in Ohio eyeing Kentucky work: Kentucky's journeyman path is relatively short — two years of apprentice time plus an exam — but as a lead, you're realistically looking at the master license, because that's the credential that pulls permits and supervises crews. That's an exam, $250, and insurance requirements.
If you're a Kentucky journeyman or master eyeing Ohio: Ohio's contractor license wants five documented years, a Business and Law exam, and half a million in liability coverage. Start collecting your permits and W-2s now — the 2024 rule change gave you four ways to document experience, which is genuinely more forgiving than the old permits-only system.
If you're a shop owner hiring: techs who already hold credentials in both states are a genuine hiring advantage in this metro. When you interview a lead candidate, ask which side of the river they're licensed on and what's in progress on the other side. It tells you how fast they can run unsupervised work anywhere in the metro.
Keep both current. Kentucky's annual birth-month renewal and Ohio's annual renewal with continuing education will not remind each other. Put both dates on the calendar the day you're licensed, or you'll discover the lapse when you're trying to pull a permit.
Bottom line#
Cincinnati's river split isn't just geography — it's two licensing philosophies. Ohio credentials the business (contractor license, five years, insurance). Kentucky credentials the person (journeyman/master, statewide). A lead tech who holds both can work any job in the metro without waiting on paperwork, and in a market where shops are competing for experienced techs, that's leverage. Do the unglamorous paperwork now — pull your W-2s, save your permits, book the exams — and the river stops being a barrier.
Browse current plumbing openings across the Cincinnati metro on ServiceTechnician's job board — filter by journeyman, lead, and master-level roles to see which shops are hiring for both sides of the river.