Plumbing License Requirements by State
Plumbing licensing splits along similar lines to electricians: many states license plumbers through a state board, while several delegate licensing to cities and counties. Requirements typically combine apprenticeship hours with a plumbing code examination. The exact hours, fees and exams are set by each state's board - here is the state-by-state breakdown, sourced from official licensing authorities.
Last updated August 7, 2026. Licensing rules change - confirm with the official board before applying.
National exam basics
No national plumber license exists. States that license plumbers set their own hours and exams; some defer to local jurisdictions.
Plumbing License requirements by state
FAQ
Do I need a state plumber license?
It depends on the state. Most states license plumbers at the state level, but states like Illinois, Kentucky, Missouri, New York, and Pennsylvania defer to city or county licensing, so verify with your local jurisdiction.
How many apprenticeship hours are required?
State programs generally require 4,000-10,000 hours (2-5 years) of supervised on-the-job training plus classroom education before sitting for the journeyman exam.
What exams do plumbers take?
Journeyman and master plumbers take a state or local plumbing code exam covering installation, drainage, venting, and gas piping; many boards also require continuing education to renew.
Is there reciprocity between states?
Reciprocity is uncommon for plumbers. Most states require their own exam even when apprenticeships and hours from another state are accepted.