Sec. 3. (a) The department shall prepare a list of impaired waters for the purpose of complying with federal regulations implementing Section 303(d) of the federal Clean Water Act (33 U.S.C. § 1313(d)). In determining whether a water body is impaired, the department shall consider all existing and readily available water quality data and related information. The department, before submitting the list to the United States Environmental Protection Agency, shall:

(1) post the list to the department’s Internet web site;

(2) publish in the Indiana Register a link to the list posted to the department’s Internet web site;

(3) make the list available for public comment for at least forty-five (45) days; and

(4) provide information about the list to the board.

     (b) The board shall adopt a rule that:

(1) establishes the methodology to be used in identifying waters as impaired; and

(2) specifies the methodology and criteria for including and removing waters from the list of impaired waters.

     (c) In the establishment of the total maximum daily load for a surface water under Section 303(d)(1)(C) of the federal Clean Water Act (33 U.S.C. § 1313(d)(1)(C)), the department shall, in identifying the surface water under Section 303(d)(1)(A) of the federal Clean Water Act (33 U.S.C. § 1313(d)(1)(A)), make every reasonable effort to identify the pollutant or pollutants under consideration for the establishment of the total maximum daily load.

     (d) The department shall comply with subsection (e) if either of the following applies:

(1) The department:

(A) is unable, in identifying the surface water as described in subsection (c), to identify the pollutant or pollutants under consideration for the establishment of the total maximum daily load; and

(B) determines, after identifying the surface water as described in subsection (c), that one (1) or more pollutants should be under consideration for establishment of the total maximum daily load.

(2) The department:

(A) in identifying the surface water as described in subsection (c), identifies the pollutant or pollutants under consideration for the establishment of the total maximum daily load; and

(B) determines, after identifying the pollutant or pollutants as described in clause (A), that one (1) or more other pollutants should be under consideration for establishment of the total maximum daily load.

     (e) The department complies with subsection (d) if the department does the following before making a pollutant or pollutants the subject of consideration for the establishment of the total maximum daily load:

(1) Determines and demonstrates that either or both of the following apply:

(A) The surface water does not attain water quality standards (as established in 327 IAC 2-1 and 327 IAC 2-1.5) due to an individual pollutant, multiple pollutants, pollution, or an unknown cause of impairment.

(B) The surface water:

(i) receives a thermal discharge from one (1) or more point sources; and

(ii) does not have or maintain a balanced indigenous population of shellfish, fish, and wildlife.

(2) Posts on the department’s Internet web site the determination referred to in subdivision (1).

(3) Makes the determination referred to in subdivision (1) available for public comment for at least forty-five (45) days.

(4) Presents the determination referred to in subdivision (1) to the commissioner for final approval after the comment period under subdivision (3).

As added by P.L.140-2000, SEC.16. Amended by P.L.78-2009, SEC.14; P.L.100-2021, SEC.7.