For the control or enforcement of the transit of waste, the Interregional Packaging Commission (IRPC) and the regional authorities are competent since 1 July 2014 (the sixth reform of the state):

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The new authority for the notification of transit of waste is the Interregional Packaging Commission (IRPC):

IRPC
Gaucheretstraat 92-94 Rue Gaucheret
1030 Brussel / Bruxelles
E-mail: info@ivcie.be
www.ivcie.be 

The Régions are competent for the control and management of waste transit:

Brussels-Capital Region : www.bruxellesenvironnement.be / www.leefmilieubrussel.be

Walloon Region : environnement.wallonie.be

Flemish Region : www.omgevingvlaanderen.be