water bill in quad paid by owner?

[Robert Fornwalt]

I looked at 2 quadplexes this week and both had the utilities split (i.e. gas and electric paid by the tenants) but the water bill was paid by the owner. meaning that there was only one water meter. 

1. is this the norm?
2. how do I go about getting the tenants to pay the water bill?    

if I can do this the deal has a higher ROI.

also, both quads had washers/dryers in the basement. how long should I wait before I convert them to coin-operated for extra revenue?

thanks in advance