Mexican President Felipe Calderón has inaugurated a 370mn-peso (US$27.4mn) wastewater treatment plant in Querétaro state's capital city of the same name.
National water authority Conagua covered 94mn pesos of the cost, while private investors supplied the remainder, according to a release.
The new plant will treat 750l/s, equivalent to 90% of the city's wastewater, bringing total treatment levels in the city to 100%.
Treated wastewater will be reused in the industrial sector and for irrigation of agricultural land, reducing the amount of potable water currently used for these purposes, said Conagua director José Luis Luege.
Conagua aims to increase national wastewater treatment levels to 60% by 2012 and has so far funded the construction of 682 plants, the release said.