(a) The scope of plumbing work that an individual may perform is dictated by the type of license, endorsement, or registration held.
(b) An individual who holds a current Master Plumber License and meets the requirements of a Responsible Master Plumber (RMP):
  (1) may advertise or otherwise offer to perform or provide plumbing to the general public;
  (2) may enter into contracts or agreements to perform plumbing;
  (3) shall obtain plumbing permits to perform plumbing work;
  (4) may perform plumbing work without supervision; and
  (5) shall supervise plumbing work performed by other licensees or registrants.
(c) An individual who holds a current Journeyman or Master Plumber License may perform or supervise plumbing work:
  (1) under the supervision of a RMP; and
  (2) only under contracts or agreements to perform plumbing work secured by a RMP or a person who has secured the services of a RMP.
(d) An individual who holds a current Tradesman Plumber-Limited License may:
  (1) perform or supervise plumbing work on one or two-family dwellings:
    (A) under the supervision of a RMP; and
    (B) only under contracts or agreements to perform plumbing secured by a RMP or a person who has secured the services of a RMP; or
  (2) assist in the installation of plumbing other than for one or two-family dwellings under the on-the-job supervision of a Journeyman or Master Plumber.
(e) An individual who holds a current Plumbing Inspector License may perform plumbing inspections as an employee or independent contractor of a political subdivision or state agency for compliance with health and safety laws and ordinances.
  (1) An individual who holds a current Plumbing Inspector License with a current Medical Gas Piping Installation Endorsement may perform inspections of piping that is used solely to transport gases used for medical purposes.
  (2) An individual who holds a current Plumbing Inspector License with a current Water Supply Protection Specialist Endorsement may perform inspections of plumbing work associated with the treatment, use and distribution of rainwater to supply a plumbing fixture, appliance, or irrigation system.
  (3) An individual who holds a current Plumbing Inspector License with a current Multipurpose Residential Fire Protection Sprinkler Specialist Endorsement may perform inspections of multipurpose residential fire protection sprinkler systems installed in a one or two-family dwelling.
(f) An individual who holds a current Journeyman or Master Plumber License with a current Medical Gas Piping Installation Endorsement may install piping that is used solely to transport gases used for medical purposes:
  (1) under the supervision of a RMP who holds a current Medical Gas Piping Installation Endorsement; and
  (2) only under contracts or agreements to perform medical gas piping installations secured by a RMP who holds a current Medical Gas Piping Installation Endorsement or a person who has secured the services of a RMP who holds a current Medical Gas Piping Installation Endorsement.
(g) An individual who holds a current Journeyman or Master Plumber License with a current Water Supply Protection Specialist Endorsement may:
  (1) perform Customer Service Inspections pursuant to 30 Texas Administrative Code §290.46(j). Minimum Acceptable Operating Practices for Public Drinking Water Systems; or
  (2) install, service or repair plumbing associated with the treatment, use and distribution of rainwater to supply a plumbing fixture, appliance, or irrigation system:
    (A) under the supervision of a RMP who holds a current Water Supply Protection Specialist Endorsement; and
    (B) only under contracts or agreements to perform, install, service, and repair plumbing associated with the use and distribution of rainwater to supply a plumbing fixture, appliance, or irrigation system secured by a RMP who holds a current Water Supply Protection Specialist Endorsement or a person who has secured the services of a RMP, in accordance with Board Rules, who holds a current Water Supply Protection Specialist Endorsement.
  (3) A Water Supply Protection Specialist Endorsement shall not be used in lieu of a Plumbing Inspector License to perform plumbing inspections. A Plumbing Inspector may perform a Customer Service Inspection even if the individual does not hold a Water Supply Protection Specialist Endorsement.
(h) An individual who holds a current Journeyman or Master Plumber License with a current Multipurpose Residential Fire Protection Sprinkler Specialist Endorsement may install a multipurpose residential fire protection sprinkler system in a one or two-family dwelling:
  (1) under the supervision of a RMP who holds a current Multipurpose Residential Fire Protection Sprinkler Specialist Endorsement; and
  (2) only under contracts or agreements to perform multipurpose residential fire protection sprinkler system installations secured by a RMP who holds a current Multipurpose Residential Fire Protection Sprinkler Specialist Endorsement or a person who has secured the services of a RMP who holds a current Multipurpose Residential Fire Protection Sprinkler Specialist Endorsement.
(i) An individual who holds a current Plumber's Apprentice Registration may assist a licensee with the installation of plumbing:
  (1) under the direct supervision of a person licensed by the Board;
  (2) under the supervision of a RMP; and
  (3) only under contracts or agreements to perform plumbing work secured by a RMP or a person who has secured the services of a RMP.
(j) An individual who holds a current Plumber's Apprentice Registration and a current Residential Utilities Installer Registration may construct and install only yard water service piping and building sewers for one or two-family dwellings:
  (1) under the supervision of a RMP; and
  (2) only under contracts or agreements to perform plumbing work secured by a RMP or a person who has secured the services of a RMP.
(k) An individual who holds a current Tradesman Plumber-Limited License or Plumber's Apprentice Registration and a current Drain Cleaner Registration may install cleanouts and remove and reset p-traps for the purposes of eliminating obstructions in building drains and sewers:
  (1) under the supervision of a RMP; and
  (2) only under contracts or agreements to perform plumbing work secured by a RMP or a person who has secured the services of a RMP.
(l) An individual who holds a current Plumber's Apprentice Registration and a current Drain Cleaner-Restricted Registration may clear obstructions in sewer and drain lines through any existing code-approved opening:
  (1) under the supervision of a RMP; and
  (2) only under contracts or agreements to perform plumbing work secured by a RMP or a person who has secured the services of a RMP.

Source Note: The provisions of this §365.1 adopted to be effective May 18, 1982, 7 TexReg 1748; amended to be effective September 9, 1982, 7 TexReg 3143; amended to be effective September 1, 1983, 8 TexReg 3186; amended to be effective June 2, 1987, 12 TexReg 1661; amended to be effective August 25, 1993, 18 TexReg 5399; amended to be effective December 8, 1993, 18 TexReg 8786; amended to be effective August 8, 1994, 19 TexReg 5710; amended to be effective June 7, 1996, 21 TexReg 4688; amended to be effective January 31, 1999, 24 TexReg 557; amended to be effective December 18, 2000, 25 TexReg 12386; amended to be effectiveDecember 30, 2001,26 TexReg 10587; amended to be effective November 8, 2004, 29 TexReg 10266; amended to be effective May 2, 2010, 35 TexReg 3497; amended to be effective February 11, 2014, 39 TexReg 659; amended to be effective September 1, 2017, 42 TexReg 3774; amended to be effective November 23, 2022, 47 TexReg 7685