Garbage disposal units are extremely common in the US but virtually unknown in Europe, mostly because of local regulations which ban them. What is the rationale behind this? Is there really a risk of damaging the local sewage if you install one despite the ban?
Part One: valid reasons
Different communities will have built different sewage treatment facilities, with different design load capacities. There are newer communities in various spots in the USA which actually require food waste to be Dispos-al-ed, as this cuts down on edible waste in dumps (reducing gas emission and vermin population). Their treatment facilities were built with capacity in mind. Other communities, or older regions, do not have such capacity and need to minimize the amount of solid waste in the sewer system.
Part Two actual reasons
Sadly, many laws and regulations get passed with the best of intentions, and 5or 10 or 50 years later the world has changed. Getting a legislature to review and fix old laws is almost as difficult as getting quarks to exist as solo particles.