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    Title: Water Conditioning Installer -Master
    Alternate Title:
    Description: Water conditioning installer: a person, other than a water conditioning contractor, who has demonstrated practical knowledge of water conditioning installation and servicing. Minnesota Department of Labor and Industry (DLI)
    Subject: Water Conditioning
    Creation Date: 9/11/2008 2:18:30 PM
    Modification Date: 9/3/2026 5:16:50 PM
    Agency Name: Labor and Industry (DLI), Minnesota Department of
    Agency URL: http://www.dli.mn.gov
    Agency Description: The agency ensures Minnesota’s work and living environments are equitable, healthy and safe. The agency oversees the state's programs for apprenticeship, construction codes and licensing, dual-training pipeline, occupational safety and health, wage and hour standards, workers' compensation and youth skills training programs. The Office of Combative Sports, within the Department of Labor & Industry, ensures Minnesota's combative sporting events are conducted in a manner that minimizes injuries and ensures fair competition.
    Agency Phone: 651-284-5005
    Agency Fax: Agency URL: http://www.dli.mn.gov
    Agency Address:
    443 Lafayette Road N.

    St. Paul
    MN 55155

    Division Name: Construction Codes and Licensing Division (CCLD)
    Division URL: http://www.dli.mn.gov/about-department/our-areas-service/construction-codes-and-licensing
    Division Description:
    Division Phone: Division Fax: Division URL: http://www.dli.mn.gov/about-department/our-areas-service/construction-codes-and-licensing
    Unit Name: Licensing and Certification Services
    Unit URL:
    Unit Description:
    Unit Phone: 651-284-5034
    Unit Fax: Contact person(s): dli.license@state.mn.us
    Unit URL:
    Audience: Hold Application URL: https://www.dli.mn.gov/ims
    Renewal URL: https://www.dli.mn.gov/ims
    Versa URL:
    Requirements:
    Review:
    Review:

    Plumbers

    Water Conditioning Licensing

    Water conditioning license basics

    What is water conditioning work
    A water conditioning system is designed to treat water to alter, modify, add or remove mineral, chemical or bacterial content, in a water distribution system. Water conditioning work includes the installation and servicing of water conditioning systems in:

    • a single-family residential unit, which has been initially established by a licensed plumber, and does not involve a direct connection without an air gap to a soil or waste pipe; or

    • a multifamily or nonresidential building, where the plumbing installation has been initially established by a licensed plumber. Isolation valves are required for all water conditioning installations and must be readily accessible.

      • In multifamily or nonresidential buildings, water conditioning does not include:

        • a valve that allows isolation of a water conditioning installation;

        • piping greater than two-inch nominal pipe size; or

        • a direct connection without an air gap to a soil or waste pipe.

    Anyone licensed by the Minnesota Department of Labor and Industry (DLI) as a plumber can perform water conditioning work in Minnesota without obtaining a separate water conditioning license.


    You can perform water conditioning work in Minnesota if you are:

    • At least 18 years old or a high school graduate (or 16 years old if you are employed by a company owned by one or both of your parents).
    • Licensed with DLI or registered with DLI as a registered unlicensed plumber or registered unlicensed water conditioner.
    • A W-2 employee of a licensed plumbing or water conditioning contractor or registered plumbing employer.
    • Licensed owner or officer of a licensed plumbing or water conditioning contractor or restricted plumbing contractor.
    You can perform water conditioning work without a license if:

    • You are registered with DLI as a registered unlicensed plumber or registered unlicensed water conditioner.

    • Your work falls under the scope of the work your employer is authorized to perform.

    • Your work is always directly supervised by a licensed journeyworker or master plumber or water conditioner journeyworker or master.

    Water conditioning master exam and license

    You must pass an exam to apply for a water conditioning master license. To qualify to take the water conditioning master license exam, you must:

    • Have been licensed as a water conditioning journeyworker for at least one year.

    • Have practical experience for the following minimum number of hours in these areas:

      • Installation:  200 hours

      • Servicing:  300 hours

      • Planning:  250 hours

      • Supervising:  250 hours

    The exam

    If you do not pass the exam you must wait 30 days before reapplying. When you pass the exam you will receive instructions on how to pay for your license.


    License renewal


    Master water conditioner licenses expire December 31 of the year after the year in which the license was first issued, and every two years from then on. To renew your license:
    Rules: 4716.0092

    Statutes: 326B.46

    Forms:
    Fees:

    Initial Application - $50

    Renwal - $93

    Late Renewal - $133


    Period of Issuance:



    Length of Determination:
    Other Info:
    Activity: Water Conditioning
    License Detail URL:

    Plumbing and Mechanical Contractors

    License and Registration Lookup

    Minnesota Department of Labor & Industry (DLI)

         


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