Commercial Plumbing Inspector

License Information

Per Wis. Admin. Code § 305.625, a person who holds a credential issued by the Department as a certified Commercial Plumbing Inspector may conduct plumbing inspections and plumbing plan reviews for the purpose of administering and enforcing Wis. Admin. Code ch. SPS 325.

A person who inspects plumbing as a certified Commercial Plumbing Inspector shall:

  • Maintain a record of the inspections made including the dates and the findings of the inspections;

  • Provide a copy of the inspection report to the property owner or his or her agent;

  • Make his or her inspection records available to the Department upon request.

Application for License

3149Application for Commercial Plumbing Inspector Certification
3073​Trades ​Payment Form

Reinstate a Commercial Plumbing Inspector Certification that has been Expired more than 4 Years

  1. Complete requirements for the method you are applying under (see Form #3149 for more information).
  2. Submit an application, supporting documentation and fee:
    • Application for Commercial Plumbing Inspector Certification (Form #3149)
    • See Form #3149 for total fee for the method you are applying under

Renewal Information


Renewal Method

Department of Safety and Professional Services

Trades Credentialing Unit
PO Box 78780
Milwaukee, WI  53293-0780​


If you have questions regarding your renewal, please email

When mailing your renewal, please allow up to 21 calendar days [per Wis. Admin. Code SPS § 305.04 (1)] from the date your payment is processed to receive an update regarding your renewal.

Getting Certified to Work with Lead Based Paint

Training and certification are required for professionals who offer or conduct regulated lead-based paint activities in pre-1978 housing and child-occupied facilities. These activities include:

  • Abatement of Lead Hazards
  • Lead Testing, Inspection, and Risk Assessment
  • Most paint-disturbing renovation work (for example, replacing windows, scraping paint prior to re-painting)
  • Post renovation and post-abatement clearance (including dust wipe sampling to measure lead dust left behind)

By getting certified and working safely, you protect your own and others' health, and show professional responsibility. For more information about certification, visit the Wisconsin Department of Health Services​ website.​​​