I have a duplex house hack I am still working on and I am about 2 weeks from rent ready. I have manicuple water. The issue here is the water gets billed quarterly and the town will not let owners transfer utility ownership to the Tennant. So I have to pay the bill but obviously I dont want to. I am trying to get a little creative on how to do this without getting overly complicated. I was floating the idea of charging a flat rate monthly. And give anything extra back at the end of the quarter.

@Richard Arden My recommendation is to put into your rental agreement that you bill each unit for the water they use plus a small surcharge of about 10% (more than the municipality charges you) to reimburse you for the cost of metering and billing.  Then install a wifi enabled water meter on the water main for each duplex so you can read the two meters from anywhere.   Water meters cost $65 to $800 ea depending on the features you choose.  Installing wifi enabled water metering also provides you with the safety feature of receiving leak alert notifications from a number of the meters.  Just google WiFi Water Meter or check out some of these sites.

$65 https://www.kickstarter.com/projects/azapps/osiris-the-65-smart-water-monitor#

$200 https://www.homedepot.com/p/Streamlabs-Smart-Home-Water-Monitor-UFMT-1000/305141000

$500 https://meetflo.com/products/flo-home-water-system/

$700https://www.phyn.com/product/

$800 https://www.buoy.ai/ (includes install) or $18/m0

@Mr Davido oh awsome idk how that escaped me. Thank you