It's actually the exact opposite to what he says. In the US you can do almost anything you want with human remains, while in Europe it's much more restricted. In Denmark for example, you have to have the body/ashes buried in a licensed cemetery. You can't keep the ashes yourself, you can't bury them in your backyard, you can't spread them at some random special place (except for the sea in rare circumstances).
The reason for restrictions in Denmark is to protect our clean ground water. If people could just place dead corpses or ashes everywhere, the drinking water would be polluted with heavy metals and other chemicals.
So like your drinking water isn't cleaned or filtered? It's simply just the groundwater in Denmark? I can't imagine creamed remains actually being a problem with a water supply, seems extreme.