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STAR Plumbing Mastery

  • The initial cost for this certification is $136.00.
  • Candidates must score a minimum of 79.4% to pass.
  • Candidates can re-take the exam if they fail for an additional $136.00 fee.
  • This certification is valid for five (5) years from issuance.
  • Recertification of this certification can be accomplished by successfully passing a fifty (50) question, non-proctored, multiple choice “open book” examination within thirty days of the expiration date of certification. Candidates must answer thirty-seven of the questions (74%) correctly on the exam to achieve a passing grade. 

Effective July 1, 2020, STAR Mastery Examinations will only be administered by computer.


A STAR Plumbing Mastery certification candidate is a qualified individual who can demonstrate mastery of the trade and will be skilled and experienced in the design, installation, maintaining, servicing, and repairing water systems; drainage, waste, and vent systems; storm water systems; fuel gas systems; water heating systems; and specialty systems, utilizing knowledge of national, state, and local plumbing codes to protect the health and welfare of the general public.

A qualified plumber may perform these tasks alone, or through the supervision of other individuals.

It is expected that the STAR Plumbing Mastery examination candidate is a plumber who has completed a UA training program or equivalent, and/or has five years of experience in the industry.

To Qualify

  • Candidates must provide five (5) years of documented work experience installing and servicing of plumbing systems or provide documentation of being in the fifth (5th) year of a plumbing training program involving the installation and servicing of plumbing systems.

Application and Examination Request Forms

Submit Application Online (PSI ONLY)

Online Recertification Examinations

Locate PSI Centers

To find the nearest PSI location follow steps 1 – 5:
1. Click on the link: Nearest PSI Location
2. On the Select Organization drop down select Certification/Professional Associations
3. On the Select Sponsor Name drop down select National Inspection, Testing and Certification Corporation ( NITC)
4. On Select the Examination Name, Select the exam you are interested in taking, the click on continue at the bottom of the page.
5. Next enter you zip code and search for the nearest location.
If you need any help please feel free to call NITC at (877) 457-6482.