Hey Todd,
How's it going!? You can call around and see if anyone is charging RUBs in your area. Just call as a renter and see what is included in the rent. I know near my building, I've only found one other building that is currently charging a RUB ($25 for water/sewer).
I also called a property manager that has a few buildings in my area and they had never heard of RUBs but loved the idea. My hope is to keep in contact with them to help change the climate in the area. Networking is important even after you buy!
I'm also looking at the average income of the renter in the area so I know what they can afford. I think that has to play a role. Our plan is to submeter down the line since we have individual water heaters and then the tenant gets an actual bill so we don't have to worry about confusion over "am I paying my fair share".
Still sorting this out myself so I'd love to hear more from others.