(a) A discharge may be classified as a spill of national significance (SONS) by the Administrator of EPA for discharges occurring in the inland zone and the Commandant of the USCG for discharges occurring in the coastal zone.

(b) For a SONS in the inland zone, the EPA Administrator may name a senior Agency official to assist the OSC in communicating with affected parties and the public and coordinating federal, state, local, and international resources at the national level. This strategic coordination will involve, as appropriate, the NRT, RRT(s), the Governor(s) of affected state(s), and the mayor(s) or other chief executive(s) of local government(s).

(c) For a SONS in the coastal zone, the USCG Commandant may name a National Incident Commander (NIC) who will assume the role of the OSC in communicating with affected parties and the public, and coordinating federal, state, local, and international resources at the national level. This strategic coordination will involve, as appropriate, the NRT, RRT(s), the Governor(s) of affected state(s), and the mayor(s) or other chief executive(s) of local government(s).