(1) "Board" means the state plumbing board.

(1.5) "Gas piping" means any arrangement of piping used to convey fuel gas, supplied by one meter, and each arrangement of gas piping serving a building, structure, or premises, whether individually metered or not. "Gas piping" or "gas piping system" does not include the installation of gas appliances where existing service connections are already installed, nor does such term include the installations, alterations, or maintenance of gas utilities owned by a public utility certified pursuant to article 5 of title 40, C.R.S., or a public utility owned or acquired by a city or town pursuant to article 32 of title 31, C.R.S.

(2) "Journeyman plumber" means any person other than a master plumber, residential plumber, or plumber's apprentice who engages in or works at the actual installation, alteration, repair, and renovation of plumbing in accordance with the standards, rules, and regulations established by the board.

(3) "Master plumber" means a person who has the necessary qualifications, training, experience, and technical knowledge to properly plan, lay out, and install and repair plumbing apparatus and equipment including the supervision of such in accordance with the standards, rules, and regulations established by the board.

(4) "Colorado plumbing code" or "the code" means a code established by the board that consists of standards for plumbing installation, plumbing materials, conservation, medical gas, sanitary drainage systems, and solar plumbing that could directly affect the potable water supply.

(4.1) "Colorado fuel gas code" means a code adopted by rule by the board for the inspection of plumbing fuel gas pipe installations.

(4.5) (a) "Conservation" means efficiency measures that meet national guidelines and standards and are tested and approved by a nationally recognized testing laboratory, including:

(I) Water-efficient devices and fixtures; and

(II) The use of locally produced materials, when practicable, to reduce transportation impacts.

(b) When conservation conflicts with safety, the board shall give primary consideration to safety.

(c) Nothing in this subsection (4.5) affects the board's authority to establish the Colorado plumbing code as specified in section 12-58-104.5.

(5) (a) "Plumbing" includes the following items located within the building or extending five feet from the building foundation, excluding any service line extending from the first joint to the property line: All potable water supply and distribution pipes and piping; all plumbing fixtures and traps; all drainage and vent pipes; all water conditioning appliances connected to the potable water system; all building drains, including their respective joints and connections, devices, receptacles, and appurtenances; all multipurpose residential fire sprinkler systems in one- and two-family dwellings and townhouses that are part of the potable water supply; and all medical gas and vacuum systems in health care facilities.

(b) Notwithstanding paragraph (a) of this subsection (5), the following is not included within the definition of "plumbing":

(I) Installations, extensions, improvements, remodeling, additions, and alterations in water and sewer systems owned or acquired by counties pursuant to article 20 of title 30, C.R.S., cities and towns pursuant to article 35 of title 31, C.R.S., or water and sanitation districts pursuant to article 1 or article 4 of title 32, C.R.S.; or

(II) Installations, extensions, improvements, remodeling, additions, and alterations performed by contractors employed by counties, cities, towns, or water and sewer districts which connect to the plumbing system within a property line; or

(III) Performance, location, construction, alteration, installation, and use of on-site wastewater treatment systems pursuant to article 10 of title 25, C.R.S., which are located within a property line.

(6) "Plumbing apprentice" means any person other than a master, journeyman, or residential plumber who, as his principal occupation, is engaged in learning and assisting in the installation of plumbing.

(7) "Plumbing contractor" means any person, firm, partnership, corporation, association, or other organization that undertakes or offers to undertake for another the planning, laying out, supervising, installing, or making of additions, alterations, and repairs in the installation of plumbing. In order to act as a plumbing contractor, the person, firm, partnership, corporation, association, or other organization must either be or employ full-time a master plumber. "Plumbing contractor" does not include a water conditioning contractor, a water conditioning installer, or a water conditioning principal.

(8) "Potable water" means water which is safe for drinking, culinary, and domestic purposes and which meets the requirements of the department of health.

(8.5) "Qualified state institution of higher education" means:

(a) One of the state institutions of higher education established under, specified in, and located upon the campuses described in sections 23-20-101 (1)(a) and 23-31-101, C.R.S., limited to the buildings owned or leased by those institutions on said campuses;

(b) The institution whose campus is established under and specified in section 23-20-101 (1)(b), C.R.S., but limited to the buildings located in Denver at 1380 Lawrence street, 1250 Fourteenth street, and 1475 Lawrence street; and

(c) The institution whose campus is established under and specified in section 23-20-101 (1)(d), C.R.S., but limited to current and future buildings owned or leased or built on land owned on or before January 1, 2015, by the university of Colorado on the campus described in section 23-20-101 (1)(d), C.R.S.

(9) "Residential plumber" means any person other than a master or journeyman plumber or plumbing apprentice who has the necessary qualifications, training, experience, and technical knowledge, as specified by the board, to install plumbing and equipment in one-, two-, three-, and four-family dwellings, which shall not extend more than two stories aboveground.

(10) (a) "Water conditioning contractor" means a person that:

(I) Undertakes or offers to undertake for another the planning, laying out, supervising, installing, or making of additions, alterations, or repairs in the installation of water conditioning appliances in one-, two-, three-, or four-family dwellings, which must not extend more than two stories aboveground; and

(II) Is required to be registered pursuant to section 12-58-105 (4).

(b) "Water conditioning contractor" does not include a plumbing contractor.

(11) (a) "Water conditioning installer" means a person that:

(I) Has the necessary qualifications, training, experience, and technical knowledge to properly plan, lay out, and install water conditioning appliances in one-, two-, three-, and four-family dwellings, which must not extend more than two stories aboveground, in accordance with the standards and rules established by the board;

(II) Is certified by a national water conditioning association recognized by the board, with the type of certification specified by the board; and

(III) Is required to be registered pursuant to section 12-58-105 (5).

(b) "Water conditioning installer" does not include a licensed plumber.

(12) (a) "Water conditioning principal" means a person that:

(I) Has the necessary qualifications, training, experience, and technical knowledge to properly plan, lay out, and install water conditioning appliances in one-, two-, three-, and four-family dwellings, which must not extend more than two stories aboveground, including the supervision of such work in accordance with the standards and rules established by the board;

(II) Is certified by a national water conditioning association recognized by the board, with the type of certification specified by the board; and

(III) Is required to be registered pursuant to section 12-58-105 (6).

(b) "Water conditioning principal" does not include a licensed plumber.