Indiana Code Title 8. Utilities and Transportation § 8-1-13-23

(a) A general district corporation is a corporation formed under this chapter for the purpose of furnishing services to local district corporations.  A general district corporation may be formed to do business in all, or a stated number of the counties of this state.  No such corporation shall have the authority or right to do business with a local district corporation in any county already named as a part of the territory of another general district corporation unless, prior to its incorporation, consent for it to transact business in that county shall have been given by the existing general district corporation or corporations then authorized to furnish services to the local district corporations in that county.  However, nothing in this chapter shall be construed to allow such a newly formed general district corporation to engage in the business to acquire, own, operate, maintain, and improve a system or systems.  A general district corporation may be organized by:

(b) A local district corporation is a corporation formed under this chapter for the purpose of furnishing services to its members.  A local district corporation shall not be permitted to exercise any of the powers granted under this chapter until at least one-half ( 1/2 ) of the heads of farm families residing in the territory described in its proposed articles of incorporation shall have agreed in writing to become members of the corporation and made a minimum payment for such membership as in said articles provided.