@Alecia Loveless is correct--tenants need access 24/7 to their electric service panel, water and heat, assuming those are individual utilities for each unit. 

At 1500F that film of water evaporates in 2 seconds. 

It had 22 of the 25 lots occupied but we'll be fixing it up, filling it up, billing back water and raising rent up to market.

Many times, when i replace a water heater and take a look into some of the short pipes that connect, they are approx 80 percent closed. 

However once all was complete, the tub and toilet water still had a yellowish tent to them.

Sounds like you stopped water which is most important.

I'd personally say pulling your water heater out and replacing with a wall mount on demand one, would be worth the cost to have in unit washer dryer if you are staying there or renting it, it would be worth it.its always worth doing the big stuff well and correct even if you are cleaning up after someone, the long term hold always prevails, its just a little frustrating front sometimes, but hang in there!

Same property listed water bill paid by landlord so how much does it cost to put individual meters for each property so cost can be moved to tenants? 

I just don't want to buy that close to the water due to flooding concerns.  

What happens if the water service line has to be replaced?