About 34,650 gallons of untreated sewage was discharged near near 101 South Middleton Drive NW, indicated by the teal dot, and reached the Little Cawcaw Swamp. Image: Brunswick County GISMore than 34,000 gallons of untreated wastewater is believed to have been discharged from a damaged sewer line tap in Calabash on Wednesday. Brunswick County Public Utilities staff determined that a 2-inch sewer tap gate valve had failed. Officials believe about 34,650 gallons of untreated sewer was discharged and reached the Little Cawcaw Swamp. Samples were taken downstream of the discharge and remediation of the affected site was completed, according to the release.