(a) Any premises not exempted in subsection (b) of this section, which is provided water service by a public or private water supply system and which has or is proposed to have any of the following systems, is subject to this division:
(1) A secondary water supply.
(2) A water treatment system.
(3) A boiler, water or steam.
(4) A commercial or industrial process or equipment which uses water including, but not limited to, plating tanks, water-cooled equipment, product washing equipment and air conditioning units.
(5) A sewage liquid waste or solid waste treatment or process system.
(6) A lawn irrigation system.
(7) A location which supplies potable water for mobile units for cleaning or transport.
(8) A temporary water service.
(9) A wet fire protection system.
(10) Any other possible source of backflow.
(11) Any pressure-increasing equipment over system pressure.
(b) The following are not subject to this division:
(1) Except for lawn irrigation systems, any premises which contains only structures not exceeding two stories in height and which utilizes only such plumbing fixtures as drinking fountains, lavatories, water closets and urinals, or appliances such as residential dishwashers or residential clothes washing machines.
(2) A boiler at a residential structure serving less than six dwelling units which utilizes no chemical treatment.
(Ord. No. 144, 5-16-2005)