Section 250. Purpose

The board of supervisors of each county may establish,
  consolidate, or extend county water,  water  quality  treatment,  sewer,
  wastewater  disposal, drainage or refuse districts (hereinafter referred
  to in  this  article  as  the  "district")  in  the  manner  hereinafter
  provided:
    1.  For  the  purpose of developing or acquiring a supply of water for
  (a)  wholesale  distribution  to  other  municipalities,  districts   or
  persons,  corporate  or otherwise, within the county water district, (b)
  retail distribution, except as hereinafter provided, or  (c)  both  such
  wholesale and retail distribution;
    1-a.  For  the  purpose  of  (a) procuring by purchase, lease or other
  means and installing  water  quality  treatment  units  or  devices,  if
  required;  providing periodic testing and monitoring of raw and finished
  water  from  private  wells  in  the  district;  monitoring,  modifying,
  repairing,  replacing,  operation  and  maintenance,  regenerating water
  quality treatment  units  and  devices  and  the  administering  of  the
  treatment  and  disposal  of residuals generated in the operation of the
  district pursuant to rules and regulations adopted by the public  health
  council  under section two hundred twenty-five of the public health law;
  (b) assisting local, state and federal agencies and officials in efforts
  to establish causes of, and implement remedial measures to reduce  water
  contamination  and  protect  future water resources within the district;
  (c) conduct public meetings and issue an annual public report to members
  of the district on the operation, financial position and  water  quality
  condition  of said district; provided, however, that with respect to any
  town in the county the board of supervisors shall first  determine  that
  such  district  or  service  will not be established or provided by such
  town.
    2. For the purpose of (a) the conveyance from other municipalities and
  districts within the  county  of  sewage,  and  treatment  and  disposal
  thereof,  (b)  collection,  except  as hereinafter provided, or (c) both
  such conveyance and such collection;
    3.  For  the  purpose  of  administration  and   planning   (including
  educational     programs),     design,    installation,    construction,
  rehabilitation,  replacement,  operation  and   maintenance   (including
  pumping  and  inspections),  monitoring, residual treatment and disposal
  and regulation of private on-site wastewater disposal  systems  of  such
  district;
    4. For the purpose of drainage of storm water and other waters, either
  surface or subsurface, within the county;
    4-a.  For the purpose of effecting lake protection and rehabilitation,
  and any activities necessarily related thereto.
    5.  For the purpose of the  collection  and  disposition  of  garbage,
  ashes, rubbish and other waste matter within the county.
    6.  A county district established hereunder may consist of two or more
  noncontiguous  areas  in  which  the  water, sewer, wastewater disposal,
  drainage or refuse system (hereinafter referred to in  this  article  as
  the  "system")  will  be  interrelated  and  interdependent, however, in
  Suffolk county the  term  "interrelated  and  interdependent"  shall  be
  deemed  to  mean  that the noncontiguous areas must be within the county
  and  have  the  same  administrative  head.  However,  a  water  quality
  treatment district established hereunder may consist of noncontiguous or
  contiguous  benefited  parcels  of  property  and  shall be created by a
  resolution of the county board of supervisors,  upon  petition  after  a
  public hearing.
    7.  Except  in  the  county  of  Suffolk,  no county district shall be
  established hereunder which shall consist wholly of territory within one

  city, within one village or within that portion of one town outside of a
  village.
    8.  Notwithstanding  any  other  provision of law a sewer district may
  also exercise all the powers of a wastewater disposal  district  if  the
  map  and  plan  prepared  pursuant to section two hundred fifty-three of
  this chapter, or amended pursuant to section two  hundred  fifty-three-b
  of this chapter, includes on-site wastewater disposal systems.