A.
On January 22, 1985, Section 1100 of the New York State Public Health Law was amended by Section 136.3 to Part 136 of Chapter III of Title 10 of the Official Compilation of Codes, Rules and Regulations of the State of New York, referred to herein as Public Law 1100: "This chapter shall apply to Otsego Lake and all watercourses tributary thereto or which may be developed in the future to serve as sources of water supply of the Village of Cooperstown in the Towns of Otsego, Middlefield and Springfield. . . "excluding "any areas not within Otsego County and, in addition, shall also exclude Allen Lake and its tributary watercourses."
B.
Public Health Law § 136.3(d)(6)(ix) states: "Before any existing sewage disposal system is altered or any new septic system is constructed on the watershed, the plans in relation thereto shall have first been approved by the Board of Water Commissioners of the Village of Cooperstown. Standards for water treatment works as published from time to time by the New York State Department of Health shall comprise the criteria to approve any proposed sewage disposal system. For existing systems that cannot meet these standards due to lot restriction, the guidelines shall be as outlined by the Board of Water Commissioners."
C.
The Village of Cooperstown Water Board established the Watershed Supervisory Committee (WSC) in 1985 as a means to administer Public Law 1100 on behalf of the Water Board, with representation from each of the affected municipalities, two members from the Village and one member from each of the Towns (five members in all).
D.
In 1994 the Otsego Lake Watershed Council was established with "representatives from the Towns of Middlefield, Otsego and Springfield and the Village of Cooperstown" with participation from the public and a broad base of stakeholders for the purpose of preparing a management plan for the Otsego Lake watershed. "A Plan for the Management of the Otsego Lake Watershed" was published in April 1998, and subsequently endorsed for implementation by each of the municipalities noted above. Page 7 of the 1998 Plan presents a list of recommendations containing 14 items. Item 13, "Plan Administration and Financing," states in part "continue and further define the Otsego Lake Watershed Supervisory Committee's role in coordinating the management of the lake and watershed."
E.
The Watershed Council voted itself out of existence in March 2003, whereupon the Otsego County Water Quality Coordinating Committee (WQCC), a broadly based coalition of environmental groups, voted to accept the responsibility for continued management of the 1998 Plan on March 31, 2003. Subsequently WQCC disbanded and WSC continued under the original laws, supported by the Village of Cooperstown. On August 22, 2016 following a Public Hearing, the Cooperstown Village Board combined the separate Water and Sewer boards into a single Water and Sewer Board.
