I imagine the Elves being quite adverse to the smell of faeces, just doesnt seem right for them, so they must have invented plumbing as one of the first things.
For the humans, I imagine them being like "real humans" - Gondor probably quite clean, owing to the Elven influence.
I imagine Rohan and Bree as quite filthy, like historic Medieval cities.
The plumbing of Barad-Dur YEECH no wonder it was called the Black Tower
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