Section 56-A. Use by the state, individuals and corporations outside corporate limits

1. Any city having a population of fifty  thousand  or
  less  may  sell to a public or private corporation, or to an individual,
  the right to make connection with its sewer system for  the  purpose  of
  discharging  sewage  therein  from  outside the city limits, and fix the
  term, consideration and conditions therefor. The board  shall  not  sell
  nor  permit  the  use  of its sewer system under this section if thereby
  such sewer system will be  rendered  inadequate  for  the  city  or  its
  inhabitants.   The   term  "public  corporation"  shall  mean  a  public
  corporation as defined in section three of the general corporation law.
    2. Any city having a population of fifty thousand or less may contract
  with the state of New York or with the state  authority  having  control
  and  supervision  of any state institution, and the state of New York or
  the  state  authority  having  control  and  supervision  of  any  state
  institution  may  contract  with the board of sewer commissioners of any
  such city, to provide sewerage and sewage disposal  facilities  for  the
  conveyance,  treatment and disposal of the sewage of such state or state
  institution either within or without the corporate limit of said city on
  such conditions and conveying such powers to the  state  or  such  state
  authority  and  for  such  consideration and such period of time as said
  sewer commissioners and the state of New York or  such  state  authority
  may agree.
    3. Any city having a population of fifty thousand or less may contract
  with   the  United  States  of  America  or  with  the  federal  agency,
  administration or  authority  having  control  and  supervision  of  any
  federal  institution  or  installation  to  provide  sewerage and sewage
  disposal facilities for the conveyance, treatment and  disposal  of  the
  sewage  of  such  federal  institution  or installation either within or
  without the corporate limits of the city on such  conditions,  for  such
  consideration  and  for  such period of time as said sewer commissioners
  and the United States of America or such federal agency,  administration
  or authority may agree.