Section 11-1108. Supervision and extension of system

A system of water works
  acquired  or  established  under this article shall be under the control
  and supervision of the board of water  commissioners.  The  board  shall
  keep  it  in  repair  and  may,  from  time to time, extend the mains or
  distributing pipes within the  village,  replace  obsolete,  inadequate,
  damaged,  destroyed  or  worn-out  apparatus  and  equipment, improve or
  reconstruct  existing  facilities  and  appurtenances  and  acquire   or
  construct  additional  facilities.  The board of water commissioners may
  determine that the cost of extending the mains or distributing pipes, as
  herein provided, shall be borne wholly by the village, or wholly by  the
  owners of land benefited or abutting on the street on which said work is
  done,  or  partly  at  the  expense of each. If such expense or any part
  thereof is to be assessed  upon  adjoining  land,  the  board  of  water
  commissioners  may  apportion  it upon the land and assess the same as a
  whole or by installments. Such assessment  and  the  collection  thereof
  shall  be  made  pursuant  to  the  provisions  of  article five of this
  chapter.