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The license information below is specific to the state of Minnesota.
Plumbers, Pipefitters, and Steamfitters
Supervisors of Construction and Extraction Workers
A license is required for a water conditioning installer or contractor to work in a city with a population of 5 000 or more Licensed water conditioning persons can only install and service water conditioning equipment in single family dwellings
Minnesota Department of Labor and Industry
443 Lafayette Road North
St. Paul,
MN
55155
Phone: (651) 284-5005
Email: dli.communications@state.mn.us
Data is collected by the Department of Employment and Economic Development.