(a) When vacant property is to be improved, or existing improvements upgraded, and sewer service is required, and a town sanitary sewer is not available, the sewer service line shall be connected to a private sewage disposal system complying with the regulations of the state and county.
(b) At such time as a public sewer becomes available to a property served by a private sewage disposal system, as provided in this section, a direct connection shall be made to the public sewer in compliance with this section at the time of the first malfunction of the private system; and any septic tanks, cesspools and similar private sewage disposal facilities shall be abandoned and filled with suitable material.
(c) The owner shall operate and maintain the private sewage disposal facilities in a sanitary manner at all times, at no expense to the town.