Authority: IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3-1; IC 13-18-4-1

Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-2

Sec. 5. (a) Customers shall construct an air gap, or install a reduced pressure principle backflow preventer or double check valve assembly, in accordance with section 7 of this rule, on the customer service line to:

(1) tanks used only to store water from the PWS for fire suppression that are constructed to maintain the bacteriological quality of the water, in compliance with 327 IAC 8-2.7; 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 8-2.7; and

(C) produce, without treatment, water meeting the drinking water quality standards enumerated in 327 IAC 8-2.7.

(b) Customers shall construct an air gap, or install a double check valve assembly or reduced pressure principle backflow preventer, in accordance with section 7 of this rule, for a fire sprinkler system, to prevent stagnant water from backflowing into the drinking water supply. For a fire sprinkler system with a chemical additive, customers shall install a reduced pressure principle backflow preventer to prevent the chemical additive backflowing into the drinking water supply.

(c) A secondary source of supply of a type other than those enumerated in subsections (a) and (b) must not be physically connected on the customer service line to or into the facility.

(Water Pollution Control Division; 327 IAC 8-10-5; filed Sep 24, 1987, 3:00 p.m.: 11 IR 716; filed Mar 31, 1999, 1:50 p.m.: 22 IR 2517; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; filed Nov 13, 2012, 11:39 a.m.: 20121212-IR-327100414FRA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA; readopted filed Jun 14, 2019, 1:59 p.m.: 20190710-IR-327190246BFA; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA; filed Nov 24, 2025, 9:07 a.m.: 20251224-IR-327240428FRA)