Indiana Code Title 36. Local Government § 36-9-23-36

Sec. 36. (a) Except as provided in subsections (b) and (c), a municipality may exercise powers granted by this chapter in areas within ten (10) miles outside its corporate boundaries.

(b) The mileage limitation in subsection (a) does not apply to the provision of sewage treatment service for an entity that is described in section 16(b)(2) of this chapter.

(c) In an area referred to in subsection (a), a municipality may not:

to provide storm water management services to the area if the county provides storm water management services to the area under IC 8-1.5-5.