I know i'm late to reply to this post, but there are several was you can go about this. You can use a straight RUBS method or a 50/50 RUBS method that is a lot easier then you think.
Here are a few options for Straight Occupancy:
- Occupant: $100 water bill / 6 occupants total = $16.67 per tenant
- Square Footage: $ 100 water bill/ 2400 total square feet= .042 cents x the square footage of the unit
- Bedroom: $100 water bill/ 5 bedrooms (assuming your triplex is (2) 2 bedrooms and (1) 1 bedroom = $20/ bedroom
Example of 50/50 (occupant & sq footage):
$100 water bill / 2 ($50/ occupants & $50/ square footage)
$50/ 6 occupants = $8.33 per occupant
+
$50/ 2400 sq feet (est triplex square footage) = .021 cents
For a couple living in a 1 BR 1BA (650 sq ft) = 2 occupants x $8.33 = $16.66
650 sq ft x .021 cents = $13.65
This couple would pay $30.31 of a $100 water bill.
If you have any questions, about the "why" to the different methods, feel free to reach out to me.
