Sec. 23-36. Secondary sources of supply; installation of air gaps or other devises.
(a) Customers shall construct an air gap or install a reduced pressure principle backflow preventer or a double check valve assembly in accordance with the provisions of section 23-38 of this article on the customer service line to:
(1) Tanks used only to store water from the public water supply for fire suppression that are constructed to maintain the bacteriological quality of the water, in compliance with 327 IAC 8-2; or
(2) Secondary sources of supply that:
a. Use well water as the only private source of supply;
b. Are constructed to maintain the bacteriological quality of the water, in compliance with 327 IAC 8-2; and
c. Produce, without treatment, water meeting the drinking water quality standards enumerated in 327 IAC 8-2.
(b) Customers shall construct an air gap or install a reduced pressure principle backflow preventer in accordance with the provisions of section 23-38 of this article on the customer service line to or into a facility having a secondary source of supply of a type other than those enumerated in subsection (a) hereinabove, that is used only for fire suppression.
(c) No secondary source of supply of a type other than those enumerated in subsections (a) and (b) herein shall be physically connected on the customer service line to or into the facility.