The embattled Brazilian iron ore pellet-maker unveiled details of a plan to clean up the Doce river, flooded after a tailings dam collapse in November 2015.
The project involved improving Pedasí district's potable water system, rehabilitating a wastewater pumping station and laying a new collector sewer.
At nearly US$40mn, the tender entails the construction of a new collector sewer and a second module at the water treatment plant in the city of San Carlos de Bariloche.
Sanitation and wastewater treatment are still some of the most pressing challenges for Latin American countries, according to BNamericas' latest infrastructure IS report.
Authorities began the construction of the first housing units at Santa Olga, which was flattened by fires in January.
Mayor Miguel Ángel Mancera said the city needs a large number of new potable water treatment plants to be able to meet the demand of its population.
The São Paulo state water utility called three tenders aimed at improving water supply and sewerage systems in the metropolitan region of the state capital.
Water-intensive industries are seeking to automate submersible pumps and flow control mechanisms in their water treatment plants, according to Mexican water treatment engineering firm Aguas Latinas.