Plumbers in Missouri

How Missouri licenses plumbers

There is no statewide plumber license; cities or counties license plumbers.

Businesses: Missouri's Division of Professional Registration has no plumbing board, so any plumbing contractor license comes from the city or county where the work is done.

Local rules: Plumber licenses are issued by the cities and counties (political subdivisions) that require them, and requirements vary by jurisdiction.

Ask your city or county building department whether it requires a plumbing license and permit, and confirm the plumber holds that local license before hiring.

We could not confirm every detail from Missouri’s own sources, so treat this as a starting point and check with the agency.

Sources: revisor.mo.gov, documents.house.mo.gov, pr.mo.gov. Checked October 2026 from official sources. This is not legal advice.

Before you hire

Ask for the license number and check it on the official lookup where one exists. Ask for proof of insurance and a written, itemized estimate, and ask who pulls the permit if the job needs one – water heaters, repiping and sewer lines often do.

Eight questions to ask every plumber