How to Verify a Licensed Plumber in Montana

Montana requires plumbers to hold a license from the Montana Plumbing Board under the Department of Labor and Industry before performing any plumbing work. Licensed plumbing contractors must also carry a $10,000 surety bond. Verifying a plumber's license at erd.dli.mt.gov before hiring takes two minutes and can prevent costly problems down the line.

This guide covers Montana's plumber licensing requirements, how to verify credentials, what bond is required, and what else to check before signing a contract.

Does Montana require plumbers to be licensed?

Yes. Montana requires plumbers to hold a valid license from the Montana Plumbing Board under the Department of Labor and Industry (DLI) at erd.dli.mt.gov. The licensing requirement applies to both individual plumbers and plumbing contracting businesses. All paid plumbing work in Montana requires a licensed plumber — there is no project-size threshold below which a license is not required.

Montana's plumbing licensing law covers installation, repair, and replacement of plumbing systems in residential and commercial buildings. The DLI maintains the public license database and investigates complaints against licensed plumbers. The Montana Plumbing Board sets licensing standards, administers exams, and approves apprenticeship programs.

In Montana, where temperatures can drop well below zero, frozen and burst pipes are a significant risk. According to the Insurance Information Institute, water damage and freezing account for more than 20 percent of all homeowners insurance claims. A licensed plumber with Montana-specific experience knows how to install systems that resist freeze damage.

What plumber license types does Montana issue?

Montana's Plumbing Board issues Master Plumber, Journeyman Plumber, and Apprentice Plumber licenses to individuals. A Master Plumber has passed a comprehensive exam, holds multiple years of journeyman experience, and can supervise others and qualify plumbing contracting businesses. A Journeyman Plumber is licensed to perform most plumbing work under master oversight. Apprentices must work under direct supervision and are enrolled in an approved apprenticeship program.

Montana plumbing license tiers:

• Master Plumber— Highest individual license. Can supervise, permit, and qualify as the responsible party for a licensed plumbing contracting business.
• Journeyman Plumber— Licensed to perform plumbing installations and repairs under master oversight.
• Apprentice Plumber— Must work under direct supervision. Enrolled in an approved apprenticeship.

When hiring a plumbing contractor in Montana, the business should hold a DLI contractor license and the individual doing the work should hold a current Master or Journeyman Plumber license.

What bond does a Montana plumbing contractor need?

Montana plumbing contractors must carry a $10,000 surety bond as a condition of their DLI contractor license. The bond provides financial protection if the contractor fails to complete work or violates code requirements. Beyond the bond, verify general liability insurance (at least $300,000 for residential projects) and workers' compensation for employees. Request certificates and confirm active coverage with the insurer before any work begins.

How do I verify a plumber's license in Montana?

Go to erd.dli.mt.gov and use the Montana DLI's public license lookup. Search by the plumber's name, business name, or license number. Confirm the license type is Master or Journeyman Plumber, the status is active, and the expiration date has not passed. Montana plumbing licenses require periodic renewal — an expired license is not valid. Also confirm the contracting business holds a current DLI contractor license.

What to verify in the search results:

• License type— Master Plumber for supervisors and contractors; Journeyman for field work.
• Status— Active. Any other status means no current authorization.
• Expiration date— Must be current.
• Business license— Confirm the contracting company also holds a valid DLI license.
• Complaint history— Review any prior disciplinary actions in the DLI database.

What else should I check before hiring a Montana plumber?

Beyond the DLI license, verify the $10,000 surety bond, active general liability insurance, and workers' compensation. Get a written contract with scope of work, materials, timeline, and payment schedule. Ask for references from recent Montana plumbing projects. Check the DLI complaint history and the Better Business Bureau for any patterns of problems.

For larger projects — new construction, bathroom remodels, or whole-house repiping — confirm the contractor will pull the required permits from the local building department. Unpermitted plumbing work can fail a home sale inspection and create liability issues if a subsequent owner discovers the work was not inspected.

CheckLicensed.com lets you verify any Montana plumber's license status instantly for $0.99. Confirm the DLI license is active at erd.dli.mt.gov or use CheckLicensed.com to check credentials before any plumbing work begins.