Sec. 46.3. (a) The following definitions apply throughout this section:
(1) "Bedroom" has the meaning set forth in 410 IAC 6-8.3-6.
(2) "Bedroom equivalent" has the meaning set forth in 410 IAC 6-8.3-7.
(3) "Septic tank soil absorption system" has the meaning set forth in IC 13-11-2-199.5.
(b) Subject to the rules provided under IC 13-26-5-2.5 and IC 36-9-23-30.1, if a property owner makes an improvement to the property owner's dwelling, the property owner is not required to upgrade the property's septic tank soil absorption system or to connect to a sewer system, and to discontinue use of a septic tank soil absorption system if:
(1) the improvement does not include the addition of a bedroom or bedroom equivalent; and
(2) the property owner has a written determination as required by section 125(f)(2) of this chapter provided by a qualified inspector (as defined in IC 36-9-23-30.1) that the septic tank soil absorption system is not failing.