So, I think it was yesterday, I finally decided to not ignore it and explore the Vegas sewers, and found something very interesting, much like the Vault 21 power supply, I noticed there was a terminal named something akin to 'Central Sewage Control', and it too was locked down under House. My question is, what would it be controlling? Perhaps fresh water/running water? This COULD Explain The Strip having the Ultra Luxe fountain and running plumbing works.

Anywho, what's your opinion on this forumers?

I think you hit the nail on the head.