The departmental government says users in small districts have been hit with increases of up to 140%.
Following a request filed with national transparency agency INAI, the water authority will have to provide the documents that were prepared prior to launching construction of the now-cancelled mega airport in Texcoco.
The state governor promised to construct more facilities to store rainwater.
The mayor of Santa Marta will visit desalination facilities in Israel this week.
Authorities in the Brazilian state are concerned that tailings following the January dam collapse could contaminate the São Francisco river.
The national government and Antofagasta's regional council will invest US$21mn in reconstruction works in Loa province.