Mexico's Jalisco state has wrapped up the first phase of a 192mn-peso (US$14.4mn) cleanup operation on the Ahogado river basin.
The first phase saw the construction of 19.4km of sewerage and rainwater drainage pipes that will connect to a wastewater treatment plant and drainage pipelines to be completed under the next phase of works.
Funds for the project were provided by federal, state and municipal governments.
The municipality of Tlajomulco de Zúñiga has also demolished six poorly functioning wastewater treatment plants and plans to tear down another five that are not in use, the municipality said in a release.
The El Ahogado wastewater treatment plant, with eventual capacity to treat 2,250l/s, is scheduled to open next year. Mexican firm Atlatec, in association with Servicios de Agua Trident, was awarded a 17-year concession for the plant in November 2008.