N.Y. Comp. Codes R. & Regs. tit. 21 § 851.3
It shall be the policy of the commission to promote and encourage planning for regional solutions to water pollution problems including problems derived from both point and nonpoint sources of pollution. The commission may recognize that the most efficient and environmentally acceptable regional solution may be small multiple facilities spread throughout a watershed. The use of regional water pollution control facilities and/or institutional arrangements providing optimum combinations of efficiency, reliability and service area will be required throughout the Delaware River Basin to the maximum extent feasible. The commission will cooperate with industries and State, county and municipal agencies seeking a regional solution to water pollution problems. The commission may provide planning, and when necessary, constructing, financing and operating services required for regional solutions to water pollution problems where other appropriate agencies do not provide such services.
N.Y. Comp. Codes R. & Regs. Tit. 21 § 851.3