An authority may enter upon and take and hold by purchase, condemnation or otherwise the whole or any part of any real property or interest therein which it determines is necessary or desirable for use in connection with a wastewater system. No authority shall acquire or construct all or any part of a wastewater system until after a public hearing at which the affected property owners shall have an opportunity to be heard concerning the proposed acquisition or construction. Notice of the time, place and purpose of such hearing shall be mailed not later than fifteen days before the date of the hearing by certified mail, return receipt requested, to the owner of any property to be taken for the proposed acquisition or construction at such owner’s address as shown in the last-completed grand list of the municipality in which such property is located or at any later address of which the authority may have knowledge, and shall be published at least ten days before the date thereof in a newspaper having a general circulation in the municipality in which such property is located.