Section 1106. Limitations; city of New York

Nothing contained in this
  chapter shall extend the sanitary control of the board of  water  supply
  of  the  city  of  New York, beyond the sources of potable water supply,
  tributary to the Catskill and Delaware aqueducts; and the powers granted
  by this chapter to the board of water supply of the  city  of  New  York
  shall cease at the time of the transference of the jurisdiction over the
  source of water supply, by the board of water supply to the commissioner
  of  environmental  protection  of  the  city of New York; and at no time
  shall the commissioner of environmental protection of the  city  of  New
  York  and  the  board  of  water  supply  of  said city have or exercise
  concurrent powers or sanitary control over any source of  potable  water
  supply tributary to the Catskill or Delaware aqueduct.