We present the realization of the Regional Cadaster of radiofrequency electromagnetic field (RF-EMF) sources of Basilicata Region (CA.CEM.Bas.). CA.CEM.Bas. is a georeferenced database, which contains a structured set of technical, logistical and administrative information regarding the RF and low-frequency sources installed in Basilicata territory and can be easily consulted and updated via the web. The Regional Cadaster was developed in compliance with a decree of the Italian Ministry of the Environment and the protection of territory and sea, which set up the National Electromagnetic Cadaster. CA.CEM.Bas. represents a crucial tool supporting the public entities in the activities devoted to the monitoring, prevention and safety related to environmental exposure to EMF.