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SAN DIEGO — Mexico has broken ground on a long-awaited replacement for a crumbling wastewater treatment plant in Baja California that officials said will dramatically reduce the discharge of sewage that has fouled San Diego and Tijuana shorelines.

The failing and outdated San Antonio de los Buenos treatment plant in Punta Bandera, about six miles south of the border, is one of the biggest sources of water pollution in the region. Every day, the facility releases millions of gallons of mostly raw sewage into the ocean that routinely reaches San Diego County’s southernmost beaches.