Relying on RUBS is how they claim they are “fairly” allocating the water (sewage and garbage) cost to the tenants. Many landlords utilize a landlord-created mythical formula for this called RUBS that stands for Resident (or Ratio) Utility Billing System.
You should only be charged for your actual usage, not just an estimate or a guess. Kellman: A landlord can legally pass the cost of water, sewage and garbage on to the tenant, but it should be a set amount or done accurately.