(a) Any township may by agreement connect with an existing sanitary sewer owned by any municipal corporation or municipality authority for either sewage collection or treatment purposes.

(b) When any township desires to connect with the existing sewer of any municipal corporation or municipality authority, a petition shall be presented by the board of supervisors to the court of common pleas setting forth the facts. The court shall fix a day for hearing upon the petition and direct public notice be given to all interested parties. If the court is of the opinion that the connection can be made without impairing the usefulness of the existing sanitary sewer system, it shall appoint three viewers to view the premises, investigate the facts of the case, assess the necessary costs and expenses of making the connection and the proportionate part of the expense of building the original sanitary sewer system upon the township, determine the proportion of the expense for repairs which the municipal corporation or municipality authority and the township shall bear and determine all other questions liable to arise in connection therewith.