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Minnesota Department of Labor and Industry Minnesota Department of Labor and Industry Powered by Google


Plumbing and Engineering home page

For general inquiries call (651) 284-5067.

The Minnesota Plumbing Code contains information about approved materials, safe installation methods and basic plumbing principles. It is important to hire knowledgeable, qualified plumbers and plumbing contractors to make the proper decisions regarding the best materials and methods for plumbing installation.

The Minnesota Department of Labor and Industry licenses plumbers to verify that they have the necessary training and knowledge to work safe and legally. It administers additional programs for apprenticeship registration, plumbing inspections and plumbing plan review.

Plumbing webpage highlights:

bullet Fire sprinklers
Information about multipurpose potable water piping systems for residential fire sprinklers (PDF). More information about residential fire sprinklers is available on DLI's 2015 Minnesota state building codes Web page.

bullet Changes to the Federal Safe Drinking Water Act (SDWA) regarding "lead-free" plumbing
Effective Jan. 4, 2014, the Reduction in Lead Drinking Water Act requires all drinking water system materials and products including plumbing pipes, fittings and fixtures introduced into commerce or for use must meet the new "lead-free" definition. This definition has been revised from not more than 8 percent to mean "not more than a weighted average of 0.25% lead when used with respect to the wetted surfaces of pipes, pipe fittings, plumbing fittings and fixtures."

For more information about "lead-free" requirements and exemptions, visit the U.S. EPA’s website at,

bullet View the Reduction in Lead Drinking Water Act here.

Plumbing licensing information

Plumbing inspection information

Changes in plumbing plan review process

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