Indiana Code Title 16. Health § 16-41-27-11

Sec. 11. (a) A mobile home community shall dispose of sewage through the use of a public sewerage system if the sewerage system is available within a reasonable distance from the mobile home community.  If a public sewerage system is not available, sewage may be disposed of in accordance with rules adopted under section 8 of this chapter.  A water carriage system of collecting sewage shall be used.  The mobile home community operator shall require the owner of a mobile home to provide a watertight and odor-tight connection of a type acceptable to the state department under rules adopted by the state department.

(b) All occupied mobile homes, manufactured homes, and industrialized residential structures shall be connected to the sewerage system of the mobile home community at all times.  All sewer connections not in use must be closed in a manner that does not:

(c) Sewerage systems other than water carriage systems may not be approved for a mobile home community, except nonwater carriage systems may be provided for emergency use only during a temporary failure of a water or an electric system.