The book I am reading is called the Time Traveller's Guide to medieaval england with lots of stuff about Gongfermours, privies communal latrines and the like but also the gen the King of the day had hot and cold running water - so I don't see that it is impossible that Elrond had plumbing!
Minas Tirith was surrounded by the Pelennor Fields which was farm land when it wasn't a battle field. Fertiliser one obvious use as well as use in cloth fulling and leather tanning. As well as the likes of Earth closets, they may have ha.d a reed bed system (bet the Lorien and Mirkwood elves could have them) which is superbly efficient and transforms raw waste into pure water.
There is a splendid Garderobe in the Constable's house in Christchurch near the Priory. It overhangs the mill stream.
__________________
“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
|