1. (a) Subject to subsection (b), for all rules concerning residential and nonresidential onsite sewage systems, the state department shall update:

   1. (1) all matters incorporated by reference in the rules, including all bulletins, standards, and specifications incorporated by reference; and

   2. (2) all industry standard practices reflected in the rules;

      upon the recognition of new bulletins, standards, specifications, and industry standard practices that supersede the bulletins, standards, specifications, and industry standard practices incorporated by reference or otherwise reflected in the rules.

2. (b) The technical review panel established under section 27.5(b) of this chapter:

   1. (1) may recognize and notify the state department of:

      1. (A) new bulletins, standards, and specifications; and

      2. (B) new industry standard practices;

         for the purposes of subsection (a); and

   2. (2) must approve updates described in subsection (a) before the state department may update the rules concerning residential and nonresidential onsite sewage systems under subsection (a).
3. (c) Updates approved by the technical review panel described in subsection (b) and updated by the state department under subsection
4. (a) must be adopted in accordance with IC 4-22-2 .

As added by P.L.232-2023, SEC.5. Amended by P.L.151-2025, SEC.2.