Colniza has the highest homicide rate in Brazil with 165 deaths per year per 100 thousand inhabitants.

The municipality of Colniza has a mosaic of conservation units consisting of the Rio Madeirinha Ecological Station, the Rio Roosevelt Ecological Station, the Tucumã State Park and the Guariba-Roosevelt Extractive Reserve.

Satellite monitoring showed that Colniza had the highest level of deforestation in Mato Grosso in the six years from 2010 to 2016, with 78,556 hectares (194,120 acres) cleared, most of it illegally.

[4] The 13,683 hectares (33,810 acres) Rio Madeirinha Ecological Station is a fully protected environmental unit created in 1997.

[5] The 96,925 hectares (239,510 acres) Rio Roosevelt Ecological Station is a strictly protected conservation unit created in 1997.