States you can search
The plumber finder covers all 50 states and the District of Columbia, grouped by Northeast, Midwest, South and West.
How plumbing licenses work
Most states license plumbers through a state board, often with levels such as apprentice, journeyman and master plumber. A master plumber can usually run a plumbing business and pull permits. In some states licensing is handled locally by cities or counties instead.
Search your state's official licensing site for a "plumbing license lookup" to check a license number before you hire.
Permits and inspections
Local building departments often need permits for water heater replacement, repiping, new fixtures in a remodel, gas lines and sewer work. Inspections check the work meets your local plumbing code. Unpermitted work can cause problems with insurance and when you sell your home.
Insurance and bonding
Ask for proof of general liability insurance, and workers' compensation if the plumber has employees. Some states and cities also require contractors to be bonded.
Last updated: 14 October 2026
