Commission awards contract for cross-border sewage line July 13, 2021 FacebookTwitterEmail NOGALES, Ariz. (AP) — The U.S. Section of the International Boundary and Water Commission has awarded $13.8 million for rehabilitation of an aging cross-border sewage pipeline that has created flooding problems for years in a community north of the border with Mexico. The commission on Monday announced the contract for SAK Construction to undertake the first phases of work on the pipeline in Arizona's Santa Cruz County, which shares the border with Mexico's Sonora state. Installed a half-century ago, the line is made of concrete pipe that varies from 24-42 inches (61-107 cm) in diameter. It moves wastewater from Mexico into the U.S. for treatment in Rio Rico, Arizona.