Led by the attorney general's office and the ombudsman's office, the inquiry will also focus on the handling of the crisis that unfolded due to a strike by workers who had been excluded from the new concessions.
The damaged infrastructure that reportedly caused water shortages in some neighborhoods has already been repaired, according to authorities.
BNamericas takes a look at the pipeline project to transport treated wastewater from Tijuana to producers in Mexico's most important wine region.
As part of compensation measures for the 2015 catastrophe, Brazil's Samarco will provide funding for sanitation and solid waste collection.
The US$10mn proposal entails increasing the biogas co-generation capacity of a wastewater treatment plant operated by the utility.
Brazil's government has promised to step up financing for the recovery of the São Francisco river basin with funds from Eletrobras' privatization, if northeastern lawmakers support the sale.