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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.