The water engineer can also give a basic water and sewer gallon usage for a certain sq ft of space for a 1 bed , 2 bed etc. and what that runs.It will not be 100% accurate because your clients will have their own usage patterns and if leaks occur the bill can be thrown off.

They fill the property with inappropriate tenants in the months preceding the sale.

Same as the other case, I cover utilities, and usage was low, and the place looked like it's in move in condition as the roommate who lived there was hardly ever there either due to his job.Besides not violating the lease, in my case, as landlord, I came out ahead.

There are gauges that you can attach to the meter that feeds into individual units that read how much water usage is being used for each unit. 

Hi Estate AgentsI'm an app developer, exploring pain points around phone usage within the real estate industry.

Your residents are then billed for their water/sewer usage every month based on local rates by the submeter company.  

Suggestion :  pick at least two different days for open house.Do not go around showing property every time someone request a rental viewing at least not until you have one or two open houses.Reason : My experiences rental open house saves on your personal schedule,                 stress level, and car gas usages.

If you can’t sub meter then raise rent accordingly to include it all and put processes in place to help control utility usage.

Aside from a major event like a bankruptcy or foreclosure, often times its that your credit card usage balance to available credit percentage is too high.

This is a very conservative estimate but can be used to get an idea of water/sewer usage over the year.