1. The board of supervisors of a county or major part of a county in which a proposed combined water and sanitary district will be located may proceed with the establishment, operation, or dissolution of a combined water and sanitary district as provided in section 357.1B.
 2. For the purpose of establishing, operating, or dissolving a combined water and sanitary district under chapter 357 and this chapter, the term “sanitary district” includes a combined water and sanitary district where applicable.