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Wastewater treatment in Mexico's Santiago river basin region will reach 92% by 2012, national water authority Conagua said in a release.
Wastewater treatment levels in the Santiago basin, which includes Aguascalientes, Guanajuato, Jalisco, Nayarit and Zacatecas states, were at 27% in 2008 and will have tripled by 2012.
In coordination with Conagua, the Jalisco state government is currently building the Agua Prieta and El Ahogado wastewater treatment plants, which will treat 100% of wastewater in state capital Guadalajara.
Conagua aims to increase wastewater treatment levels across the country to 60% by July 2012 and has so far built 600 treatment plants, with a further 70 in the pipeline.
The largest wastewater treatment plant in Latin America, Atotonilco, is currently under construction and will treat 60% of wastewater in Mexico City.
Local municipalities currently receive 50 cents for every cubic meter of water treated, which comes from a 1.6bn-peso (US$121mn) fund set up during the current administration.