Are there any laws about scattering ashes after cremation?
No. It would be a good idea to consider carefully where you want to scatter the ashes. Cremated remains should not be scattered on private property without permission. Scattering means there is no permanent memorial site, but this might be of comfort to you. Other people save the ashes in a beautiful urn, or have the ashes mixed with clay and made into ornamental pottery. Everyone is different. Just be certain that whatever decision you make is not one you will wish undone later.
