# COMAR Title 09 — Maryland Department of Labor

## Subtitle 20 — Board of Plumbing

### Chapter 01 — State Plumbing Code

**Authority:** Business Occupations and Professions Article, §§12-205 and 12-207, Annotated Code of Maryland

**Administrative History:** Effective date:

**Administrative History:** COMAR 09.20.01—09.20.25 repealed and new Regulations .01 and .02 adopted under a new chapter, State Plumbing Code, effective October 20, 1997 (24:21 Md. R. 1448)

**Administrative History:** Regulation .01B amended effective July 23, 2001 (28:14 Md. R. 1321); May 9, 2005 (32:9 Md. R 848); May 18, 2009 (36:10 Md. R. 716); May 13, 2013 (40:9 Md. R. 789); January 2, 2017 (43:26 Md. R. 1444)

**Administrative History:** Regulation .02 amended effective July 23, 2001 (28:14 Md. R. 1321); May 9, 2005 (32:9 Md. R. 848); May 18, 2009 (36:10 Md. R. 716); May 13, 2013 (40:9 Md. R. 789); January 2, 2017 (43:26 Md. R. 1444)

**Administrative History:** Regulation .02G, H amended effective January 29, 2000 (27:1 Md. R. 75)

**Administrative History:** Regulation .02I amended effective May 12, 2003 (30:9 Md. R. 614)

**Administrative History:** Regulation .03 adopted as an emergency provision effective January 1, 2012 (39:2 Md. R. 139); emergency extended at 39:13 Md. R. 785; adopted permanently effective February 4, 2013 (40:2 Md. R. 72)

**Administrative History:** Regulation .03E amended effective January 2, 2017 (43:26 Md. R. 1444)

**Administrative History:** Regulation .04 adopted effective May 13, 2013 (40:9 Md. R. 789)

**Administrative History:** Regulation .04 amended effective January 2, 2017 (43:26 Md. R. 1444)

**Administrative History:** Regulation .05 adopted effective January 2, 2017 (43:26 Md. R. 1444)

**Administrative History:** Chapter revised effective December 30, 2019 (46:26 Md. R. 1163)

**Administrative History:** Regulation .01 amended effective November 24, 2025 (52:23 Md. R. 1138)

**Administrative History:** Regulations .02.—.04, .06, .07 repealed effective November 24, 2025 (52:23 Md. R. 1138)

#### Regulation .01 Incorporation by Reference.

*COMAR 09.20.01.01*

A. In this chapter, the documents set forth in §B of this regulation are incorporated by reference.

B. In compliance with Business Occupations and Professions Article, §§12-101(p) and 12-205(a), Annotated Code of Maryland, the Board adopts the most recent version of the following Codes as they may be amended, modified, or updated from time to time.

  (1) The International Plumbing Code (International Code Council, 500 New Jersey Avenue, N.W., 6th Floor, Washington, DC 20001), which has been incorporated by reference in COMAR 09.12.50.02-1B(2).

  (2) The International Residential Code, (International Code Council, 500 New Jersey Avenue, N.W., 6th Floor, Washington, DC 20001), which has been incorporated by reference in COMAR 09.12.50.02-1B(4) and 09.12.51.04A(2).

  (3) The International Fuel Gas Code (International Code Council, 500 New Jersey Avenue, N.W., 6th Floor, Washington, DC 20001).

  (4) The most recent version of the National Fuel Gas Code, NFPA 54.

  (5) The Liquefied Petroleum Gas Code, NFPA 58.

#### Regulation .02 Modifications to the International Plumbing Code. — Repealed.

*COMAR 09.20.01.02*

#### Regulation .03 Modifications to the International Residential Code. — Repealed.

*COMAR 09.20.01.03*

#### Regulation .04 Modifications to the National Fuel Gas Code, ANSI Z223.1, NFPA 54. — Repealed.

*COMAR 09.20.01.04*

#### Regulation .05 Limit on Lead Content.

*COMAR 09.20.01.05*

A. Definitions.

  (1) In this regulation, the following terms have the meanings indicated.

  (2) Terms Defined.

    (a) “Lead-free” means:

      (i) Containing not more than a weighted average of 0.25 percent lead when used with respect to the wetted surface of pipes, pipe fitting, plumbing fittings, and fixtures; and

      (ii) Not containing more than 0.2 percent lead when used with respect to solder and flux.

    (b) “NSF” means the standards of the National Sanitation Foundation.

B. Weighted Average Lead Content Formula.

  (1) The weighted average lead content of a lead-free pipe, pipe fitting, plumbing fitting, or fixture shall be calculated by using the following formula: For each wetted component, the percentage of lead in the component shall be multiplied by the ratio of the wetted surface area of that component to the total wetted surface area of the entire product to arrive at the weighted percentage of lead of the component. The weighted percentage of lead of each wetted component shall be added together, and the sum of these weighted percentages shall constitute the weighted average lead content of the product. The lead content of the material used to produce wetted components shall be used to determine compliance with lead-free requirements. For lead content of materials that are provided as a range, the maximum content of the range shall be used.

  (2) The use of platings, coatings, or acid wash treatments may not be used to meet the 0.25 percent weighted average lead content requirements set forth in Business Occupations and Professions Article, §§12-101(h-1)(4) and 12-101(q)(4) and(5), Annotated Code of Maryland.

C. Materials used to dispense water intended for human consumption through drinking or cooking, including piping, faucets, and valves as set forth in §§F and G of this regulation, shall be lead-free, containing not more than a weighted average of 0.25 percent lead with respect to the wetted surface as defined in §A(2)(a)(ii) of this regulation.

D. Soldered Joints.

  (1) Solder and flux for soldered joints in potable water piping shall be lead-free, containing not more than 0.2 percent lead, as defined in §A(2)(a)(ii) of this regulation.

  (2) Flux shall be recommended by the manufacturer for making soldered joints in lead-free potable water supply system piping.

E. Components.

  (1) Potable water supply components that are within the scope of NSF 61 for drinking water system components and are required to be lead-free shall comply with NSF 61 and NSF 372.

  (2) Potable water system components that are not within the scope of NSF 61 for drinking water system components but are required to be lead-free shall comply with NSF 372.

  (3) Potable water system components that are not required to be 0.25% lead-free shall be suitable for distributing potable water but may contain up to 8% lead.

F. Potable water end-use devices and potable water supply system piping that are intended to dispense water for human consumption through drinking or cooking include, but are not limited to:

  (1) Kitchen sink faucets;

  (2) Bar sink faucets;

  (3) Private bathroom sink faucets;

  (4) Drinking fountain faucets;

  (5) Kitchen hot water dispensers;

  (6) Water supply to:

    (a) Ice makers;

    (b) Potable water heaters;

    (c) Commercial grocer or supermarket misting systems used for produce;

    (d) Commercial kitchen cooking equipment; and

    (e) Production equipment for processed food containing water; and

  (7) Any other end-use device or piping that is intended to dispense or convey water for human consumption.

G. Piping components that shall be lead-free when used with lead-free end-use devices and piping that are required to be lead-free include, but are not limited to:

  (1) Main service shut-off valves;

  (2) Water service backflow prevention devices;

  (3) Water meters;

  (4) Pressure booster pumps;

  (5) Pressure reducing valves;

  (6) Strainers;

  (7) Water filters;

  (8) Check valves;

  (9) Control valves;

  (10) Vacuum breakers;

  (11) Water hammer arrestors;

  (12) Master hot water mixing valves;

  (13) In-line tempering valves;

  (14) Hot water recirculating pumps;

  (15) Branch piping shut off valves;

  (16) Balancing valves;

  (17) Fixture shut off valves;

  (18) Solenoid valves;

  (19) Tankless water heaters; and

  (20) Any other piping component associated with an end-use device or water supply piping that is required to be lead-free.

H. Materials Not Required to Be Lead-Free.

  (1) Pipes, pipe fittings, plumbing fittings or fixtures, including backflow preventers, that are used exclusively for nonpotable services such as manufacturing, industrial processing, irrigation, outdoor watering, or any other uses where the water is not anticipated to be used for human consumption are not required to be lead-free.

  (2) Potable water end-use devices and water supply system components not anticipated to dispense or convey water to be used for human consumption and not required to be lead-free, including the associated supply piping of such devices and components, include, but are not limited to:

    (a) Tub faucets or fillers;

    (b) Shower fixtures, including:

      (i) Valves;

      (ii) Heads; and

      (iii) Adapters;

    (c) Flush valves for:

      (i) Water closets;

      (ii) Urinals; and

      (iii) Bidets;

    (d) Shut off valves for clothes washers;

    (e) Lavatory faucets in public restrooms;

    (f) Laundry sink faucets;

    (g) Service sink faucets;

    (h) Faucets for laboratory applications;

    (i) Hose bibbs;

    (j) Trap seal priming devices;

    (k) Backflow prevention devices that supply nonpotable applications;

    (l) Fire hose valves;

    (m) Water hammer arrestors;

    (n) The water supply to:

      (i) Dishwashers;

      (ii) Whirlpools;

      (iii) Spas;

      (iv) Therapy pools;

      (v) Swimming pools;

      (vi) Boilers;

      (vii) Heating hot water generators;

      (viii) Humidifiers; and

      (ix) Irrigation systems;

    (o) Food production equipment that does not contact the food; and

    (p) Any other end-use device or water supply piping that is not anticipated to dispense or convey water that is to be used for human consumption.

### Chapter 02 — Enforcement of the Plumbing Law by the Board

**Authority:** Business Occupations and Professions Article, §§12-205, 12-207, 12-302(d), (e), (g)(2), and (h)(3), 12-304(d)(1), and 12-503(a), Annotated Code of Maryland

**Administrative History:** Effective date: 1971

**Administrative History:** Regulation .02, .13 amended effective January 7, 1976 (3:1 Md. R. 41)

**Administrative History:** Regulation .07 amended effective February 8, 1980 (7:3 Md. R. 263)

**Administrative History:** Regulation .15 amended effective May 26, 1976 (3:11 Md. R. 592)

**Administrative History:** Regulation .17 amended effective December 24, 1975 (2:29 Md. R. 1735)

**Administrative History:** Chapter revised effective October 26, 1981 (8:21 Md. R. 1706)

**Administrative History:** Regulation .04 amended effective August 12, 1985 (12:16 Md. R. 1605)

**Administrative History:** Regulation .04A amended effective April 21, 1986 (13:8 Md. R. 898)

**Administrative History:** Regulation .05 amended effective April 21, 1986 (13:8 Md. R. 898)

**Administrative History:** Regulation .05D adopted effective March 25, 1985 (12:6 Md. R. 595)

**Administrative History:** Regulation .06 amended as an emergency provision effective July 1, 1983 (10:14 Md. R. 1257); adopted permanently effective September 26, 1983 (10:19 Md. R. 1690)

**Administrative History:** Regulation .06 amended effective April 21, 1986 (13:8 Md. R. 898)

**Administrative History:** Regulation .06G adopted effective March 25, 1985 (12:6 Md. R. 595)

**Administrative History:** Regulation .10A amended effective February 13, 1984 (11:3 Md. R. 199)

**Administrative History:** Regulation .12A amended effective August 12, 1985 (12:16 Md. R. 1605)

**Administrative History:** Regulation .12D adopted effective July 28, 1986 (13:15 Md. R. 1734)

**Administrative History:** Regulation .15 adopted effective June 26, 1989 (16:12 Md. R. 1335)

**Administrative History:** Chapter revised effective June 22, 1992 (19:12 Md. R. 1133)

**Administrative History:** Regulation .11 adopted as an emergency provision effective March 1, 1995 (22:6 Md. R. 471); emergency status expired September 1, 1995

**Administrative History:** Regulation .11 adopted effective March 25, 1996 (23:6 Md. R. 475)

**Administrative History:** Chapter recodified from COMAR 09.20.26 to COMAR 09.20.02 effective October 20, 1997 (24:21 Md. R. 1448)

**Administrative History:** Regulation .02 amended effective May 22, 2017 (44:10 Md. R. 472)

**Administrative History:** Regulations .03B amended effective October 20, 1997 (24:21 Md. R. 1448); June 17, 2019 (46:12 Md. R. 536)

**Administrative History:** Regulations .04E amended effective October 20, 1997 (24:21 Md. R. 1448)

**Administrative History:** Regulation .05 amended effective June 17, 2019 (46:12 Md. R. 536)

**Administrative History:** Regulation .06A amended effective June 24, 2002 (29:12 Md. R. 927)

**Administrative History:** Regulation .07A amended effective May 22, 2017 (44:10 Md. R. 472)

**Administrative History:** Regulation .09 amended effective November 29, 1999 (26:24 Md. R. 1857); March 18, 2002 (29:5 Md. R. 503)

**Administrative History:** Regulation .10B amended effective February 4, 2013 (40:2 Md. R. 72)

**Administrative History:** Regulation .11 amended as an emergency provision effective December 1, 2005 (32:26 Md. R. 1993); emergency status expired April 28, 2006

**Administrative History:** Regulation .11 amended effective July 3, 2006 (33:13 Md. R. 1063)

**Administrative History:** Regulation .11 repealed effective May 22, 2017 (44:10 Md. R. 472)

**Administrative History:** Regulation .11 adopted effective June 17, 2019 (46:12 Md. R. 536)

#### Regulation .01 Qualifications of Plumbers—How Certificates May Be Issued.

*COMAR 09.20.02.01*

A. All plumbing work shall be performed, or supervised and approved, by a licensed master plumber who is:

  (1) Familiar with its design and purpose; and

  (2) Available to direct and control all journey and apprentice plumbers.

B. The license of a master plumber will be issued in the name of the master plumber.

C. All plumbing work performed, or supervised and approved, by a licensed master plumber shall be of ordinary worker-like skill and quality and shall conform both to the regulations promulgated by the Board and to applicable local laws and regulations.

#### Regulation .02 Required Training for Apprentice Plumbers.

*COMAR 09.20.02.02*

A. Before an apprentice plumber may be examined for a license as a journey plumber, the apprentice plumber shall:

  (1) Receive at least 7,500 working hours of instruction and experience in the installation and repair of plumbing material and systems, under the direction and control of a master plumber; and

  (2) Be registered with the Board for the duration of the apprenticeship training.

B. To avoid undue hardship, the Board may give credit for hours worked in the installation and repair of plumbing material and systems by an unregistered apprentice plumber.

C. It is recommended that the instruction and experience include:

  (1) Installation of piping for waste, soil, sewerage, vent and rain leader lines in copper,

    (a) Name and size of sewer fittings, wyes, tees, bend, packing, pouring, caulking joints;

    (b) Use of proper fittings in making connections;

    (c) Proper pitch in sewer lines;

    (d) Regulations on cesspools and septic tanks;

    (e) Local codes governing plumbing.

  (2) Installation of piping for hot and cold water for domestic purposes:	1,400 hrs.

    (a) Rough-in water and gas piping for fixtures;

    (b) Cut holes in floors and joist;

    (c) Measure up piping;

    (d) Run pipe in copper, steel, or plastic;

    (e) Installation of domestic water boilers and hot water heaters;

    (f) Install tankless or tank-type copper coil heaters in boilers;

    (g) Automatic gas water heaters with vent to chimney;

    (h) Measure up piping and connect to hot and cold water lines;

    (i) Use of pipe cutters and reamers;

    (j) Cut threads with stocks and dies, or with pipe threading machines;

    (k) Use of joint compound on threads and screw up fittings on pipe with pipe wrenches;

    (l) Local codes governing plumbing.

  (3) Installation of lead pipe, tin pipe, sheet lead, and solder work: 	180 hrs.

    (a) Proper use of tools;

    (b) Kinds of materials and fluxes;

    (c) Correct heating temperatures.

  (4) Assembly in position and connection of fixtures and appliances used in the plumbing

    (a) Rough-in waste, soil, and vent lines for fixtures;

    (b) Pack, pour, and caulk fittings and pipe;

    (c) Make up fittings, run piping, and hook up main sewer;

    (d) Lay out water lines, hot and cold;

    (e) Place and connect various plumbing fixtures;

    (f) Local codes governing plumbing.

  (5) Service work—maintenance and repair of plumbing:	480 hrs.

    (a) Leaks;

    (b) Renewals;

    (c) Stoppage of lines;

    (d) Alterations;

    (e) Trouble shooting plumbing systems.

  (6) Operation, care, safety, and use of all tools and materials connected with the trade:	 850 hrs.

    (a) Pipe and fittings, tees, ells, 45-degree ells and nipples;

    (b) Black, galvanized, wrought iron, wrought steel, copper, and plastic pipe;

    (c) Use and care of tools;

    (d) Pipe cutters, reamers, stocks and dies, size of wrenches, caulking irons, lead pots,

    (e) Types of tubs—corner or recess, left or right;

    (f) Lavatories—cast iron, vitreous china, and stainless steel;

    (g) Closet combinations—vitreous china, closed couples, siphon action, flushometer types.

  (7) Gas installation: 	750 hrs.

    (a) Types of gas installations—natural and LPG;

    (b) Venting gas systems;

    (c) Gas appliances and controls;

    (d) Local codes governing gas fitting.

  (8) Special purpose installations: 	180 hrs.

    (a) Swimming pools;

    (b) Fountains and planters;

    (c) Lawn sprinkling and vacuum systems;

    (d) Local codes governing plumbing.

  (9) Plan reading:	 375 hrs.

    (a) Sketching;

    (b) Sleeve drawing and deck layout;

    (c) Drawing coordination.

  (10) Builders level transit: 	275 hrs.

    (a) Layout of sewer and water lines;

    (b) Shoot grades and elevations.

  (11) Welding connected with the trade: 	480 hrs.

    (a) Gas, metallic arc, and heliarc welding;

    (b) Use of torch;

    (c) Proper flame, fluxes, and solder;

    (d) Pipe welding;

    (e) Proper welding procedures and techniques;

    (f) Identification of welding rods and materials;

    (g) Flame cutting;

    (h) Brazing.

  (12) Rigging: 	375 hrs.

    (a) Materials;

    (b) Equipment.

#### Regulation .03 Examinations for Journey Plumber Certificates.

*COMAR 09.20.02.03*

A. Each applicant for the journey plumber's examination shall provide certification that the applicant has accrued at least 7,500 working hours, that is, 4 years of apprenticeship instruction and experience in the installation and repair of plumbing material and systems, under the direction and control of a master plumber. The following conditions apply:

  (1) Up to 1,500 hours of accredited, approved school study may be applied towards the 7,500-hours requirement, which may be composed of classroom plumbing work or study under a vocational or technical program accredited by the State Department of Education or under the apprenticeship agreement registered with the Maryland Apprenticeship and Training Council;

  (2) The applicant shall furnish the certification, made under penalty of perjury, with the examination application;

  (3) Hours accrued may not be credited to an individual serving under an apprenticeship agreement registered with the Maryland Apprenticeship and Training Council unless the individual is also licensed with the Board as an apprentice plumber.

B. Examinations.

  (1) The Board shall examine qualified applicants by written examination.

  (2) If the applicant satisfactorily documents that the applicant has a disability as defined under The Americans With Disabilities Act (ADA), the Board will make those accommodations necessary for the administration of the examination.

  (3) An applicant shall attain a passing grade of 70 to qualify for licensure as a journey plumber.

C. Out-of-State Applicants.

  (1) A nonresident applicant or an applicant whose work experience has not been in Maryland shall provide certification that:

    (a) The applicant has accrued at least 7,500 working hours, that is, 4 years of apprenticeship instruction and experience in the installation and repair of plumbing material and systems, under the direction and control of a licensed master plumber; and

    (b) The master plumber under whom the applicant trained received a license by passing a written competency examination.

  (2) Up to 1,500 hours of accredited, approved school study may be applied towards the 7,500-hour requirement.

  (3) The applicant shall furnish the certification as to accrued work experience and the qualifications of the supervisory master plumber, under penalty of perjury, with the examination application.

#### Regulation .04 Examinations for Master Plumber Certificates.

*COMAR 09.20.02.04*

A. Each applicant for the master plumber's examination shall provide certification, under penalty of perjury, that the applicant has accrued at least 2 years, that is, 3,750 working hours of practical experience as a journey plumber, in the installation and repair of plumbing material and systems under the direction and control of a master plumber.

B. The candidate shall be examined on:

  (1) General knowledge of the regulations as may be provided by the Board;

  (2) Knowledge of physics and hygiene as may deal with the proper and safe methods of supplying water to a building, and of removing water and sewage from it; and

  (3) Drainage, hydraulics, pneumatics, and hydrostatics insofar as they relate to the proper construction of work required in providing plumbing services.

C. Applicants shall also be required to demonstrate their ability to comprehend and interpret plans and drawings, showing the arrangements of plumbing fixtures and other related parts of the plumbing system.

D. Unless specifically provided for, each applicant shall answer all examination questions in writing.

E. If the applicant satisfactorily documents that the applicant has a disability as defined under The Americans With Disabilities Act (ADA), the Board will make those accommodations necessary for the administration of the examination.

F. If an applicant successfully completes the examination under §E of this regulation, the Board shall grant to the applicant a license as a master plumber upon a showing that the:

  (1) Applicant's ability to function as a master plumber is not significantly impaired by the dyslexia or other reading disability; and

  (2) Applicant is otherwise competent and qualified to become a master plumber.

G. Out-of-State Applicants.

  (1) A nonresident applicant or an applicant whose work experience has not been in Maryland shall accrue a total of at least 11,250 working hours, that is, 6 years of practical experience in the installation and repair of plumbing material and systems.

  (2) The applicant shall furnish information about the applicant's work experience, under penalty of perjury, as follows:

    (a) Certification of at least 4 years of the required total number of years, that is, 7,500 working hours spent in the installation and repair of plumbing material and systems under the direction and control of a licensed master plumber;

    (b) Certification of at least 2 years, that is, 3,750 hours of work in the plumbing trade as a journey plumber;

    (c) Certification that the journey plumber's license was received by passing a written competency examination; and

    (d) Certification that the master plumber for whom the applicant worked received a license by passing a written competency examination.

  (3) If the nonresident applicant is from an area that does not require licensure of journeyperson plumbers, and the applicant holds a master plumber's license, the applicant shall provide certification with the application that:

    (a) The applicant accrued at least 7,500 hours of practical experience in the plumbing trade under the direction and control of a licensed master plumber;

    (b) The master plumber for whom the applicant worked received a license by passing a written competency examination;

    (c) The applicant's master plumber license was received by passing a written competency examination; and

    (d) The applicant has accrued at least 2 years, that is, 3,750 working hours in the installation and repair of plumbing material and systems since receiving the master plumber's license.

#### Regulation .05 Passing Grade Required for a Master's License.

*COMAR 09.20.02.05*

An applicant shall attain a passing grade of 70 to quality for a license as a master plumber.

#### Regulation .06 Applicants Failed.

*COMAR 09.20.02.06*

A. Any applicant who failed the examination for either a master or journey license may apply and pay the prescribed fee for another examination. A period of 1 month shall elapse before a failed applicant may retake an examination.

B. Applicants who have failed an examination may review their examination papers upon written request to the Board. This request shall be made within 30 days after the applicant has been notified that the applicant failed to attain the required grade.

#### Regulation .07 Applicants for Renewal of License.

*COMAR 09.20.02.07*

A. All apprentice, journey, and master plumbers eligible for renewal shall renew their licenses every 2 years.

B. All applicants for renewal, after submitting their written application for renewal accompanied by the required fee, shall be issued a new license by the Board.

C. Any applicant for renewal who has for 5 consecutive years failed to renew a license is subject to examination before being issued a new license.

#### Regulation .08 Issuing of License on a Reciprocal Basis.

*COMAR 09.20.02.08*

A. The Board shall issue a master or journey plumber license on a reciprocal basis to applicants living in Baltimore County or the Washington Suburban Sanitary District who:

  (1) Have passed the master or journey plumber examination in either jurisdiction;

  (2) Are in good standing in that jurisdiction; and

  (3) Intend to do business in Maryland outside of Baltimore County or Washington Suburban Sanitary District.

B. The Board shall give examinations for journey or master plumber licenses to applicants living outside the State who:

  (1) Demonstrate that they have served an apprenticeship, or had practical experience, under supervision equivalent to that required in Maryland; or

  (2) Demonstrate the same level of proficiency and study required of applicants serving an apprenticeship or gaining practical experience in Maryland.

#### Regulation .09 Advertisements.

*COMAR 09.20.02.09*

A. Definitions. In this regulation, the following terms have the meanings indicated:

  (1) “Current master plumber” means the individual responsible for supervising and controlling the work of all individuals providing or assisting in providing plumbing services in a business.

  (2) “Current natural gas fitter” means the individual responsible for supervising and controlling the work of all individuals providing or assisting in providing natural gas services in a business.

  (3) “Current propane gas fitter” means the individual responsible for supervising and controlling the work of all individuals providing or assisting in providing propane gas services in a business.

  (4) “License number” means the license registration certificate number displayed on the license document or propane gas fitter certificate issued to a licensee or certificate holder by the Board.

B. Requirements for Plumbers.

  (1) The license number of the current master plumber shall be displayed on all documents used by any person holding themselves out to the public as providing plumbing services.

  (2) Each vehicle that advertises plumbing services shall display the words “MD Licensed Plumber” and the license number of the current master plumber on both sides of the vehicle.

C. Requirements for Licensed Natural Gas Fitters.

  (1) The license number of the current natural gas fitter shall be displayed on all documents used by any person holding themselves out to the public as providing natural gas services.

  (2) Each vehicle that advertises natural gas services shall display the words “MD Licensed Natural Gas Fitter” and the license number of the current natural gas fitter on both sides of the vehicle.

D. Requirements for Propane Gas Fitters.

  (1) The license number of the current propane gas fitter shall be displayed on all documents used by any persons holding themselves out to the public as providing propane gas services.

  (2) Each vehicle that advertises propane gas services shall display the words “MD Certified Propane Gas Fitter” and the license number of the current propane gas fitter on both sides of the vehicle.

E. Additional Requirements for Licensees and Certificate Holders.

  (1) Each vehicle that advertises plumbing, natural gas, or propane gas services shall display the information required by this regulation on both sides of the vehicle. Display of wording shall be not less than 1-1/2 inches in height.

  (2) Each printed, audio, video, or computerized advertisement of any type, including all estimate forms, contract forms, and final statements of payment, shall clearly contain the words “MD Licensed Plumber”, “MD Licensed Natural Gas Fitter”, or “MD Certified Propane Gas Fitter” and the license number as required by §§B(2), C(2), and D(2) of this regulation.

#### Regulation .10 Qualifications for Plumbing Inspectors.

*COMAR 09.20.02.10*

A. Plumbing inspectors hired by the State, a county, or a local government after October 1, 1988, shall meet minimum standards that are established by the county or local government in consultation with the State Board, or, if there is no standard established by the county or local government, the minimum standards established by the State Board. The minimum standards established by the State Board are as follows:

  (1) The plumbing inspector shall be a licensed master or journey plumber;

  (2) The plumbing inspector shall:

    (a) Have at least 4 years experience as an inspector or craftsman in a building and construction trade, and

    (b) Pass a written examination prepared and administered by the State Board, or prepared and administered by the county or local government, provided that the examination is approved by the State Board, and certified copies of all results are provided to the State Board.

B. Each plumbing inspector shall:

  (1) Attend, at least once each year, continuing education pursuant to Business Occupations and Professions Article, §12-503(a)(1), Annotated Code of Maryland, to be conducted by the State Board, or a course which is consistent in content with the State Board's course and which is conducted by a county or local government; and

  (2) In accordance with Business Occupations and Professions Article, §12-503(a)(1), Annotated Code of Maryland, obtain a cumulative 8 hours of qualifying continuing education each calendar year.

#### Regulation .11 Passing Grade for License and Certificate Examinations.

*COMAR 09.20.02.11*

In accordance with Business Occupations and Professions Article, §12-304(d)(1), Annotated Code of Maryland, and as set forth in Regulations .03B(3) and .05 of this chapter, an applicant for any license or certificate issued by the Board shall attain a passing score of 70 to qualify for the license or certificate.

### Chapter 03 — General Regulations

**Authority:** Business Occupations and Professions Article, §§12-205, 12-207, 12-303(1), 12-311(c), and 12-312(a)(1)(xiii), Annotated Code of Maryland

**Administrative History:** Effective date: November 29, 1999 (26:24 Md. R. 1857)

**Administrative History:** Regulation .01D adopted effective March 18, 2002 (29:5 Md. R. 503)

**Administrative History:** Regulation .02 adopted effective December 12, 2013 (40:24 Md. R. 2016)

**Administrative History:** Regulation .03 adopted effective December 31, 2018 (45:26 Md. R. 1241)

#### Regulation .01 Responsibilities of Licensees.

*COMAR 09.20.03.01*

A. A licensee shall undertake to provide plumbing services only if the licensee is qualified by education, training, and experience to provide the required services.

B. A licensee shall undertake to provide plumbing services related to gas only if the licensee is qualified by education, training, and experience with the specific gas, gas system, gas utilization equipment, and associated accessories to provide the required services.

C. A licensee may not use or allow the use of a license issued by the Board for the purpose of obtaining or attempting to obtain a permit or other authority to provide plumbing services from a county or local government agency unless the licensee is:

  (1) Familiar with the design and purpose of the plumbing services to be provided, and, when any portion of the services provided is to be outside of a permanent structure, the ground conditions of the area;

  (2) Available to direct and control all journey and apprentice plumbers who will provide or assist in the providing of the plumbing services; and

  (3) Responsible for the services performed or to be performed pursuant to a contract.

D. A licensee shall maintain appropriate insurance covering any plumbing service the licensee provides. Insurance provided by an employer does not satisfy the insurance requirements of Business Occupations and Professions Article, §12-501, Annotated Code of Maryland, if a licensee provides plumbing services outside the scope of employment with the insured person or business entity.

#### Regulation .02 Street Address Required.

*COMAR 09.20.03.02*

A. This regulation applies to all applications, both original and renewal, received on or after January 1, 2014.

B. An applicant for a license shall provide to the Board the actual street address of the individual’s residence or principal business office. An applicant may not provide a post office box or private mail drop as the applicant's business address of record.

#### Regulation .03 Failure to Respond.

*COMAR 09.20.03.03*

A. If an applicant or licensee receives from the Board a written communication requesting a response, the applicant or licensee shall respond in writing within 30 days of the date of the mailing.

B. The Board shall send a written communication by first-class mail to the last address furnished to the Board by the applicant or licensee.

C. It is the responsibility of an applicant or licensee to notify the Board in writing if there has been a change in an applicant’s or licensee’s address.

D. Failure to respond as required by this regulation may be considered by the Board to be a violation of Business Occupations and Professions Article, §12-312(a)(1)(xiii), Annotated Code of Maryland.

### Chapter 04 — Cross Connection/Backflow Prevention Certification Training Program

**Authority:** Business Occupations and Professions Article, §§12-207 and 12-306(c), Annotated Code of Maryland

**Administrative History:** Effective date: July 22, 2013 (40:14 Md. R. 1174)

#### Regulation .01 Definitions.

*COMAR 09.20.04.01*

A. In this chapter, the following terms have the meaning indicated.

B. Terms Defined.

  (1) “Certified instructor” means an individual who possesses a master plumber or a journey plumber license issued by the Board or a reciprocating jurisdiction and has successfully completed an instructional certification program sponsored by an organization recognized by the Board, including, but not limited to, the University of Florida Treeo Center (TREEO), American Society of Sanitary Engineering (ASSE) Instructor Accreditation Certification, and University of Southern California Foundation for Cross Connection Control.

  (2) “Certified provider” means a person or organization who provides Board-approved cross connection/backflow prevention certification training in accordance with Business Occupations and Professions Article, §12-306(c), Annotated Code of Maryland, and meets the requirements of Regulation .02A—C of this chapter.

  (3) “Certified technician” means an individual who is certified to install, test, repair, and make reports on a mechanical cross connection/backflow prevention device or assembly after successful completion of a 32-hour cross connection/backflow prevention certification program approved by the Board in accordance with Business Occupations and Professions Article, §12-306(c), Annotated Code of Maryland.

#### Regulation .02 Approved Cross Connection/Backflow Prevention Certification Program.

*COMAR 09.20.04.02*

A. In accordance with Business Occupations and Professions Article, §12-306(c), Annotated Code of Maryland, a cross connection/backflow prevention certification program may be eligible for approval by the Board if:

  (1) The certified provider submits to the Board an application on the form that the Board provides, identifying the course provider and the provider’s credentials to offer cross connection/backflow prevention certification training;

  (2) Each program instructor is a certified instructor in accordance with Regulation .01B(1) of this chapter;

  (3) The course materials include a cross connection/backflow prevention training manual prepared by an organization identified in Regulation .01B(1) of this chapter;

  (4) In the opinion of the Board, the course curriculum provides, at a minimum, adequate training in:

    (a) Introduction to backflow prevention;

    (b) Hazards of cross connection/backflow;

    (c) Laws of backflow prevention;

    (d) Responsibilities of certified technician;

    (e) The methods, mechanisms, and installation techniques used for the prevention of backflow;

    (f) Field testing;

    (g) Field reports;

    (h) Troubleshooting;

    (i) Repair of a backflow occurrence; and

    (j) Recertification;

  (5) The program is conducted at a facility that provides adequate space and a suitable training environment in the opinion of the Board that is:

    (a) Accessible for inspection by an authorized representative or agent of the Board during normal business and class hours without prior notice; and

    (b) Equipped with adequate apparatus necessary for adequate training in the opinion of the Board including:

      (i) A test kit;

      (ii) One of each mechanical cross connection control device and assembly necessary for compliance with ASSE 1011, 1012, 1013, 1015, 1019, 1020, 1022, 1024, 1035, and 1056; and

      (iii) Mechanical cross connection control assembly set up for field testing;

  (6) The certified provider issues to an individual who successfully completes the program a:

    (a) Certificate that includes:

      (i) The name of the certified provider;

      (ii) The name of the certified technician to whom it is issued;

      (iii) A statement that the course constitutes a 32-hour cross connection/backflow prevention certification program approved by the Maryland State Board of Plumbing;

      (iv) The date of completion of the certification program;

      (v) The name and signature of the course instructor; and

      (vi) The certification technician number; and

    (b) Pocket identification card that includes:

      (i) The name of the certified technician to whom it is issued;

      (ii) The title “Certified Backflow Prevention Technician”;

      (iii) The dates for which the certification is valid; and

  (7) The certified provider notifies the Board within 10 days of any change of a certified course instructor.

B. In order for a cross connection/backflow prevention certification program to be and remain eligible for approval by the Board in accordance with Business Occupations and Professions Article, §12-306(c), Annotated Code of Maryland, the program must be able to demonstrate adequate recertification credentials including the:

  (1) Offer of recertification training for technicians every 5 years; and

  (2) Requirement that course instructors maintain instructor certification by meeting the requirements of, but not limited to, the University of Florida Treeo Center (TREEO), American Society of Sanitary Engineering (ASSE) Instruction Accreditation Certification, and University of Southern California Foundation for Cross Connection Control, which shall include completion of recertification training at a minimum of once every 5 years.

C. In addition to the requirements of §B of this regulation, in order for a cross connection/backflow prevention certification program to remain eligible for approval by the Board in accordance with Business Occupations and Professions Article, §12-306(c), Annotated Code of Maryland, every 3 years, the program provider shall provide the Board with updated information about the program which shall include:

  (1) A current list of certified instructors; and

  (2) Notification from the certified provider of changes to the course curriculum or the location of the training facility.

D. The Board may rescind its approval of a cross connection/backflow prevention certification program at any time if, in the opinion of the Board:

  (1) The certified provider demonstrates misconduct or incompetence in the performance of supervisory duties over the program;

  (2) A certified course instructor demonstrates misconduct or incompetence in the provision of applicable training; or

  (3) The certified provider fails to meet any of the requirements of §§A—C of this regulation.

E. In accordance with Business Occupations and Professions Article, §§12-306(c)(3) and 12-503, Annotated Code of Maryland, an individual appointed, designated, or employed by a county or local government as an inspector of mechanical cross connection/backflow prevention devices shall have completed a cross connection/backflow prevention certification program approved by the Board.

F. Completion of an approved cross connection/backflow prevention certification program does not authorize an individual to:

  (1) Install, test, or certify a mechanical cross connection/backflow prevention device unless the individual is licensed by the Board as a master or journey plumber in accordance with Business Occupations and Professions Article, §12-101(g) or (l), Annotated Code of Maryland; or

  (2) Assist in installing, testing, or certifying a mechanical cross connection/backflow prevention device unless the individual is licensed by the Board as an apprentice plumber in accordance with Business Occupations and Professions Article, §12-101(c), Annotated Code of Maryland.

### Chapter 05 — Fees

**Authority:** Business Occupations and Professions Article, §§12-207, 12-209, 12-303, 12-304.1, 12-306, 12-308, and 12-503; Business Regulation Article, §§2-106.9 and 2-106.10; Annotated Code of Maryland

**Administrative History:** Effective date: August 27, 2018 (45:17 Md. R. 803)

**Administrative History:** Regulation .03 amended effective March 4, 2024 (51:4 Md. R. 202)

#### Regulation .01 Purpose.

*COMAR 09.20.05.01*

This chapter is intended to carry out the provisions of Business Occupations and Professions Article, Title 12, Annotated Code of Maryland. and Business Regulation Article, §§2-106.9 and 2-106.10, Annotated Code of Maryland, In particular, it is intended to set various fees in order to cover the actual documented direct and indirect costs of fulfilling the statutory and regulatory duties of the State Board of Master Electricians, the State Board of Stationary Engineers, the State Board of Plumbing, and the State Board of Heating, Ventilation, Air-Conditioning, and Refrigeration Contractors.

#### Regulation .02 Definitions.

*COMAR 09.20.05.02*

A. In this chapter, the following terms have the meanings indicated.

B. Terms Defined.

  (1) “Board” means the State Board of Plumbing.

  (2) “License fee” means the fee paid by an applicant or licensee, as applicable, in connection with the issuance and renewal of a license and the issuance of a limited license and a reciprocal license.

  (3) “Mechanical boards” means collectively the:

    (a) State Board of Master Electricians;

    (b) State Board of Stationary Engineers;

    (c) State Board of Plumbing; and

    (d) State Board of Heating, Ventilation, Air-Conditioning, and Refrigeration Contractors.

  (4) “Secretary” means the Secretary of Labor.

#### Regulation .03 Fees and Costs.

*COMAR 09.20.05.03*

A. The Secretary and the mechanical boards have agreed to average their direct and indirect costs, based on the calculation of costs performed by the Secretary in consultation with the mechanical boards. Based on these calculations, the Board sets the following nonrefundable fees as of January 1, 2024:

  (1) Application:

    (a) Master Natural Gas Fitter — $56;

    (b) Journey Natural Gas Fitter — $28;

    (c) Apprentice Plumber/Gas Fitter — $16.50;

    (d) Apprentice Natural Gas Fitter —$16.50; and

    (e) Propane Gas Fitter Certificate — $28.

  (2) Original license and certificate:

    (a) Master Plumber/Gas Fitter — $78;

    (b) Journey Plumber/Gas Fitter — $39;

    (c) Limited Master Plumber — $78;

    (d) Limited Journey Plumber — $39;

    (e) Master Natural Gas Fitter — $78;

    (f) Journeyman Natural Gas Fitter — $39;

    (g) Propane Gas Fitter — $39;

    (h) Master Inspector — $50;

    (i) Journeyman Inspector — $50; and

    (j) Plumbing Inspector — $50.

  (3) License and certificate renewal:

    (a) Master Plumber/Gas Fitter — $78;

    (b) Journey Plumber/Gas Fitter — 39;

    (c) Apprentice Plumber/Gas Fitter —$16.50;

    (d) Limited Master Plumber — $78;

    (e) Limited Journey Plumber — $39;

    (f) Master Natural Gas Fitter — $39;

    (g) Journeyman Natural Gas Fitter — $28;

    (h) Apprentice Natural Gas Fitter — $16.50;

    (i) Propane Gas Fitter — $39;

    (j) Master Inspector — $50;

    (k) Journeyman Inspector — $50; and

    (l) Plumbing Inspector — $50.

  (4) License reactivation:

    (a) Master Plumber/Gas Fitter — $56;

    (b) Journey Plumber/Gas Fitter — $22.50;

    (c) Limited Master Plumber — $56; and

    (d) Limited Journey Plumber — $22.50.

  (5) Miscellaneous: Letter of Good Standing — $50.

B. The Secretary and the mechanical boards have agreed to average their direct and indirect costs, based on the calculation of costs performed by the Secretary in consultation with the mechanical boards. Based on these calculations, the Board sets the following nonrefundable fees as of January 1, 2025:

  (1) Application:

    (a) Master Natural Gas Fitter — $63;

    (b) Journey Natural Gas Fitter — $31.50;

    (c) Apprentice Plumber/Gas Fitter — $18.50;

    (d) Apprentice Natural Gas Fitter — $18.50; and

    (e) Propane Gas Fitter Certificate — $31.50.

  (2) Original license and certificate:

    (a) Master Plumber/Gas Fitter — $87.50;

    (b) Journey Plumber/Gas Fitter — $43.50;

    (c) Limited Master Plumber — $87.50;

    (d) Limited Journey Plumber — $43.50;

    (e) Master Natural Gas Fitter — $87.50;

    (f) Journeyman Natural Gas Fitter — $43.50;

    (g) Propane Gas Fitter — $43.50.

    (h) Master Inspector — $56;

    (i) Journeyman Inspector — $56; and

    (j) Plumbing Inspector — $56.

  (3) License and certificate renewal:

    (a) Master Plumber/Gas Fitter — $87.50;

    (b) Journey Plumber/Gas Fitter — $43.50;

    (c) Apprentice Plumber/Gas Fitter — $18.50;

    (d) Limited Master Plumber — $87.50;

    (e) Limited Journey Plumber — $43.50;

    (f) Master Natural Gas Fitter — $43.50;

    (g) Journeyman Natural Gas Fitter — $31.50;

    (h) Apprentice Natural Gas Fitter — $18.50;

    (i) Propane Gas Fitter — $43.50;

    (j) Master Inspector — $56;

    (k) Journeyman Inspector — $56; and

    (l) Plumbing Inspector — $56.

  (4) License reactivation:

    (a) Master Plumber/Gas Fitter — $63;

    (b) Journey Plumber/Gas Fitter — $25;

    (c) Limited Master Plumber — $63; and

    (d) Limited Journey Plumber — $25.

  (5) Miscellaneous Letter of Good Standing — $50.

C. An applicant for an appropriate license or certification examination shall pay the examination fee directly to the testing service chosen by the Board to develop or administer the examination, as such fees are established by the testing service selected by the Board.