The lands of the Rio Pomba basin are severely deforested, a process that began throughout the Zona da Mata during the coffee era and did not spare even the headwaters of the river. It is a factor that contributes to the degradation of the river and is also affected by the release of industrial and domestic effluents. In 2003, a major spill of more than 1 billion liters of toxic chemical waste from one industry in Cataguases caused enormous environmental damage, and the effect was detected from the Paraiba do Sul River to its mouth in the Atlantic Ocean in the state of Rio de Janeiro.