A water rate increase was approved for Davis Island residents Dec. 10 following a public hearing in Edgecomb. Selectmen serve as the town's water district trustees on services received from Wiscasset. Selectman Mike Maxim served as Edgecomb's water district trustee chairman in proposing a rate increase to mirror ones adopted by Wiscasset in August. Voters approved increasing the current $41.48 per 100 cubic feet to $49.92 and anything over up to…