|(a) The licensing requirements of this chapter do not apply to a person who: (1) is licensed by the Texas State Board of Plumbing Examiners and is working within the scope provided by the plumbing laws; (2) is registered or licensed as a professional engineer or architect or landscape architect if the work is related to the pursuit of the profession; (3) is under the direct supervision of a licensed irrigator and assists in the installation, maintenance, alteration, repair, or service of an irrigation system; or (4) is an owner of a business that employs a licensed irrigator to supervise the business' sale, design, consultation, installation, maintenance, alteration, repair, and service of irrigation systems. For the purpose of this subchapter, employs means steadily, uniformly, or habitually working in an employer-employee relationship with the intent to earn a livelihood, as opposed to working casually or occasionally. (b) The licensing requirements of this chapter do not apply to: (1) irrigation or yard sprinkler work that is performed by a property owner in a building or on premises owned or occupied by the owner as the owner's home; (2) irrigation or yard sprinkler repair work, other than extension of an existing irrigation or yard sprinkler system or installation of a replacement system that is: (A) performed by a maintenance person who does not act as an irrigator or engage in yard sprinkler construction or maintenance for the public; and (B) incidental to and on premises owned by the business in which the person is regularly employed or engaged; (3) irrigation or yard sprinkler work that is performed: (A) by a regular employee of a railroad who does not act as an irrigator or engage in yard sprinkler construction or maintenance for the public; and (B) on the premises or equipment of the railroad; (4) irrigation and yard sprinkler work that is performed on public property by a person who is regularly employed by a county, city, town, special district, or political subdivision of the state; (5) irrigation or yard sprinkler work that is performed by a person using a garden hose, hose sprinkler, hose-end product, including soaker hose, or agricultural irrigation system; (6) an activity that includes a commercial agricultural irrigation system; (7) irrigation or yard sprinkler work that is performed by an agriculturist, agronomist, horticulturist, forester, gardener, contract gardener, garden or lawn caretaker, nurseryman, or grader or cultivator of land on land owned by the individual performing the work; (8) irrigation or yard sprinkler work that is performed by a member of a property owners' association as defined by Property Code, §202.001, on real property owned by the association or in common by the members of the association if the irrigation or yard sprinkler system water real property that is less than 1/2 acre in size and is used for aesthetic or recreational purposes. (c) A person who is exempt from the license requirements of this subchapter shall comply with the standards established by Chapter 344 of this title (relating to Landscape Irrigation). The term irrigation system does not include a system used on or by an agricultural operation as defined in Texas Agriculture Code, §251.002.