Bolinas could soon incorporate more homes into its sewer system and end a decades-old ban on new wastewater connections. The Bolinas Community Public Utility District is working to show state regulators that its sewer system, which serves 163 customers downtown and on the Little Mesa, could accommodate seven more homes on a small road that descends toward the beach from Terrace Avenue. Two Canyon Road homeowners who live just 400 feet beyond the reach of…