What are the requirements for scattering ashes at sea?

Ashes must be scattered at least three nautical miles out to sea. Any scattering performed in the ocean requires that a report be sent to the United States Environmental Protection Agency (EPA) within 30 days of the date of the scattering. The report form can be found at http://www.epa.gov/region4/water/oceans/documents/burialatsea.pdf.