A plumbing contractor provides a means for a supply of safe water, ample in volume and of suitable temperature for the purpose intended and the proper disposal of fluid waste from the premises in all structures and fixed works. This classification includes but is not limited to: (a) Complete removal of waste from the premises or the construction and connection of on-site waste disposal systems; (b) Piping, storage tanks and venting for a safe and adequate supply of gases and liquids for any purpose, including vacuum, compressed air and gases for medical, dental, commercial and industrial uses; (c) All gas appliances, flues and gas connections for all systems including suspended space heating units. (This does not include forced warm air units.); (d) Water and gas piping from the property owner’s side of the utility meter to the structure or fixed works; (e) Installation of any type of equipment to heat water or fluids, to a temperature suitable for the purposes listed in this section, including the installation of solar equipment for this purpose; and (f) The maintenance and replacement of all items described above and all health and safety devices such as, but not limited to, gas earthquake valves, gas control valves, back flow preventers, water conditioning equipment and regulating valves.
Besides its basic business license, known as a Business Tax Certificate, the City of Los Angeles uses licenses and permits to regulate a number of businesses in several industries. The city primarily licenses businesses that can lend themselves to crime and endanger local residents’ safety. Los Angeles still uses traditional paper forms for its license applications and has a number of city departments including the Los Angeles Police Commissioner’s Office, involved in overseeing businesses. Many Los Angeles businesses also require licenses from Los Angeles County and the State of California. As one of America's and the world's largest cities, Los Angeles has a large and diverse economy. Major industries include entertainment, banking, securities, e-commerce, high tech, defense, aerospace, biotech, medicine, education, shipping, transportation and light manufacturing.