Indiana Code Title 13. Environment § 13-11-2-0.4

(1) that is used to contain an accumulation of regulated substances;

(2) the volume of which, including the volume of the aboveground connected pipes described in subsection (b), is not more than ten percent (10%) below the surface of the ground;

(3) with a capacity of over one thousand five hundred (1,500) gallons but not more than twenty thousand (20,000) gallons;  and

(4) that is used at:

(1) single tank;  or

(2) combination of tanks;

(1) that meets the definition set forth in subsection (a);  and

(2) in which there are separate compartments.

(1) A farm or residential tank with a capacity of not more than one thousand one hundred (1,100) gallons that is used for storing motor fuel for noncommercial purposes.

(2) A tank used for storing heating oil for consumptive use on the premises on which the tank is stored.

(3) A septic tank.

(4) A surface impoundment, pit, pond, or lagoon.

(5) A storm water or wastewater collection system.

(6) A flow-through process tank.

(7) A liquid trap or associated gathering lines directly related to oil or gas production and gathering operations.

(8) Any other tank exempted by a rule adopted by the board in accordance with regulations adopted by the Administrator of the United States Environmental Protection Agency.

(9) A pipe connected to a tank described in subdivisions (1) through (8).