Sewer billing rates for Hall County residents, particularly those in South Hall, might increase in November to offset rising service costs and slower growth rates. The proposed rate hikes, which the Hall County Board of Commissioners will vote on Thursday, are designed to stabilize revenue. But residents of the Village at Deaton Creek subdivision have called for commissioners to consider a long-term strategic plan to increase sewer users and pay off debt on the Spout Springs Water Reclamation Facility, which the county purchased from a developer in 2008 for $14.5 million.