Do You Need a Plumber License? Requirements by State (2026)

Plumbing is one of the most heavily regulated trades in the United States. Because plumbers work with water supply, drainage, and gas systems that directly affect public health and safety, most states require some form of licensure. Requirements typically distinguish between apprentice, journeyman, and master plumber levels, with each tier demanding additional experience and examination. Even in the few states that do not mandate a state-level license, local jurisdictions frequently impose their own licensing requirements.

State-by-State Plumber License Requirements

The table below shows whether each state requires a state-level plumber license, the regulation level, and a link to the relevant licensing board.

What If My State Doesn't Require a License?

In the handful of states without a state-level plumber license, local regulations almost always fill the gap. Cities and counties commonly require plumbing permits for any work that involves modifying water or gas lines, and inspections are typically required before work can be approved. Some municipalities require plumbers to register or obtain a local license before pulling permits. Always check with your local building or plumbing department to understand the rules that apply in your area.

How to Get Licensed

The path to becoming a licensed plumber generally starts with an apprenticeship program, followed by accumulating the required number of supervised work hours. Candidates must then pass a licensing examination that covers plumbing codes, safety practices, and technical knowledge. Requirements differ by state and license level. For a complete walkthrough, see our guide on how to become a plumber.

Requirements change — always verify with your state's licensing authority.