Stoneham residents beach

Just wondering how the residents of Stoneham could initiate a petition to open Spot Pond as a legal place to swim.As Spot Pond is no longer a part of the areas drinking water system, it would be great if residents could access this beautiful body of water as a place to swim. There are areas which could easily be turned into "beaches" and the addition of a "swimming hole" would be a nice asset to the town.