Knowing how to deal with the aftermath of a tsunami is important. Additional severe activity may follow initial quakes and early waves, so remain at a higher elevation until the tsunami threat has completely passed. Local officials will issue an "all clear" advisory when appropriate. Once the "all clear" advisory has been given, use caution or seek professional help when returning to your home. Upon returning, try to: Inspect damage. Make note of any visible damage carefully. Be mindful and careful of all visible and potential dangers including live wires, electrical shorts and gas or sewage leaks. Check your water supplies. Use your emergency water or boil tap water before drinking until you are told the water supply is safe. Check food supplies. Food that came in contact with floodwaters may be contaminated and should be discarded.