I've learned never to assume.... sometimes mincing words brings out a clearer picture. That is if the OP is not going to respond with a clarification????
There are contradictions - 'two rental homes' are not a 'single family dwelling'. And while it is possible to have a service on each structure - it is unstated - and if a 'single family dwelling' - more unlikely if seperate structures. If the 'extra meter' is to serve for water for both structures - it should be common metering, just as much as the seperate structure should have it's own metering. (the other 'rental home') Sure you can in many cases have an owner pay all of the utility cost for both structures as 'single family' - but why ask for a seperate meter? To me it sounds as if it is a multi-family rental property one structure fed from the other - otherwise why mention it?