Ind. Code § 6-2.5-5-12
Transactions involving tangible personal property are exempt from the state gross retail tax if:
(2) the person acquiring the property is a public utility that furnishes or sells water in a retail transaction described in IC 6-2.5-4-5 .
As added by Acts 1980, P.L.52, SEC.1. Amended by P.L.23-1988, SEC.10; P.L.71-1993, SEC.8; P.L.91-1995, SEC.1; P.L.88-2007, SEC.1.