In New Jersey, there are no state laws regarding the disposition of cremation ashes. You may keep them at home or scatter them, put them in a crypt, niche or grave. Many cemeteries provide gardens for scattering ashes and many places of worship have established memorial gardens as well.
Cremation ashes are rendered harmless, so there is no public health risk involved in scattering ashes. Common sense should be observed when choosing a place to scatter them.
If you wish to scatter ashes on public land, you should check State Park regulations or the National Park website. The EPA requires that cremation ashes scattered at sea be at least three nautical miles off shore. At beaches, lakes or rivers, you may have to obtain a permit from the appropriate state agency.