The Emergency  Management Assistance Compact (EMAC) is a national  compact among almost all states which provides form and structure to  interstate mutual aid. It establishes procedures whereby a disaster-impacted  state can request and receive assistance from other member states quickly and  efficiently. EMAC resolves two key issues up front: liability and  reimbursement. The requesting State agrees to (1) assume liability for  out-of-state workers deployed under EMAC and (2) reimburse assisting States  (once proper, EMAC-specific, documentation is provided) for  deployment-related costs.
   To the extent the specific agreement between  States meets the requirements of the FEMA policy on mutual aid agreements and  the work meets FEMA eligibility requirements, costs may be eligible for FEMA  reimbursement (see Mutual Aid Agreement) and would be subject to the Federal/non-Federal cost share  for that disaster.
   References:   Mutual Aid Agreements for Public Assistance and Fire Management  Assistance, FEMA Policy 9523.6, dated August 13, 2007
   Public Assistance Guide, FEMA 322, page 51