Eventually, Unity Will Help Grow Greater Oneonta By JIM KEVLIN It wouldn’t be cheaper right now, but the town and city of Oneonta should eventually form a “single entity” to provide municipal water in “the most cost-efficient and cost-effective manner.” That’s the conclusion of an ad hoc citizens group – former interim school superintendent David Rowley, former DEC commissioner Mike Zagata of Davenport and Roger France, a former state Health Department engineer – who took it upon themselves to delve…