Ratio Utility Billing (RUBS): Formulas, Georgia Rules, Examples

Ratio utility billing, or RUBS, is a way for a landlord to split one master utility bill among the tenants in a building. The landlord uses a formula based on square footage, occupants, bedrooms or a mix, instead of measuring each unit's actual use. It can recover real costs on older multi-unit properties. In Georgia, though, it only works when the lease discloses it and the total billed stays within what the law allows.

Below: how the math works, a worked example, the Georgia rules that matter, where RUBS goes wrong, and when you should look at submetering instead.

TL;DR

• RUBS divides a master-metered bill among units by a ratio (square footage, occupants, bedrooms or a blend). It does not measure what each unit used.
• In Georgia, tenant charges cannot exceed what the owner pays plus a reasonable billing fee, and the terms must be disclosed before the lease is signed.
• Take common-area use (pool, irrigation, laundry) out of the bill before you allocate the rest. This is the step most disputes trace back to.
• Buildings permitted on or after July 1, 2012 must be built so each unit's water use can be measured, so RUBS is mainly a tool for older buildings.
• Treat RUBS as a transitional tool. Disclose it clearly, document the formula, and plan for submetering where it is feasible.

Table of Contents

• What ratio utility billing actually is
• The common RUBS formulas
• How to calculate RUBS: a worked example
• Georgia rules every landlord should know
• Why RUBS creates friction
• Does RUBS save water?
• RUBS versus submetering versus including utilities in rent
• Setting up RUBS the right way
• What RUBS means for your returns
• Our perspective on RUBS
• Getting help with utilities, leases and management
• FAQ
• Sources

What ratio utility billing actually is

In a master-metered building, the utility sends one bill for everything: every apartment, the hallways, the landscaping, the laundry room. Under RUBS the landlord subdivides that bill among tenants using a formula built on factors such as square footage, number of occupants or number of bedrooms. No one reads a meter inside your unit.

That is the key difference from submetering, where a meter in each unit records actual consumption. The EPA's WaterSense guidance recommends metering or submetering wherever feasible and describes RUBS as another common strategy for recouping water costs. RUBS is most often applied to water and sewer, but the same logic is sometimes used for trash, gas or common-area electricity.

The common RUBS formulas

There is no single standard formula. Owners pick a basis and apply it the same way to every unit. These are the usual options:

The blended approach is common because occupancy tracks water use better than floor area does. It is also harder to defend if your occupant records are sloppy.

How to calculate RUBS: a worked example

The numbers below are illustrative, not from a real property. Say you own a 20-unit building in metro Atlanta with a $2,400 combined water and sewer bill for the month, and 40 residents.

1. Remove common areas. The property has a small pool and irrigation, which you estimate at 10% of the bill. That is $240, which the owner absorbs. Billable amount: $2,160.
2. Pick the basis. You choose occupancy. Total occupants: 40.
3. Compute the rate per occupant. $2,160 ÷ 40 = $54.00 per person.
4. Apply it per unit. A two-person household pays $108.00. A single tenant pays $54.00. A family of four pays $216.00.
5. Add a billing fee, if the lease allows one. Georgia allows a reasonable fee for establishing, servicing and billing. Keep it modest and written into the lease.
6. Check the cap. Total collected for utility charges (minus the admin fee) should never exceed the $2,160 you owe for billable usage, and in no case the full $2,400.

Two cautions. If a tenant moves out mid-month, you need a written rule for prorating, or the remaining tenants quietly absorb the vacant unit's share. And vacancy itself matters: the owner should carry a vacant unit's share, not spread it across occupied units.

Georgia rules every landlord should know

Georgia addresses this directly in O.C.G.A. § 12-5-180.1. In plain terms:

• An owner of a residential building may use equipment or an economic allocation methodology to work out water used by tenants and by common areas, and may charge tenants separately for water and wastewater.
• The total charged to tenants cannot exceed what the owner pays for water and wastewater service for the building, plus a reasonable fee for establishing, servicing and billing.
• The terms of the charges must be disclosed to tenants before any contractual agreement.
• New multiunit residential buildings permitted on or after July 1, 2012 must be constructed so that water use by each unit can be measured. That requirement does not apply to older buildings that are later renovated or rebuilt after a casualty or condemnation.

The practical reading: RUBS remains available for pre-2012 buildings, but a newer building should be set up for unit-level measurement. If you are unsure when your building was permitted, confirm that with your county or city permitting office and your attorney before you bill anyone. The statute covers water and wastewater. If you plan to allocate other utilities, such as gas or electricity, check separately with a Georgia attorney and the relevant provider tariffs.

This article is general information, not legal advice. If you are drafting a utility addendum for the first time or facing a tenant dispute, talk to a Georgia landlord-tenant attorney.

Why RUBS creates friction

The main risk is perceived unfairness. Tenant advocates at the National Consumer Law Center warn that RUBS can create problems not found in other billing systems and can enable abusive practices. The formula is set by the landlord, tenants can't see or control the inputs, and a bill can rise when a neighbor uses more.

Three things reliably turn a routine charge into a dispute:

• Common areas left in the bill. Industry best practices call for deducting common-area use like pools, irrigation and laundry from the master bill before allocating the remainder. If tenants feel they are paying for the pool, they will say so.
• Surprise charges. A utility line that appears after move-in, with no explanation, reads as a rent increase in disguise. Georgia also has its own timing rules for those: see our guide to rent increase notice in Georgia.
• Opaque math. A tenant who asks how the bill was built should get a straight answer in writing within a day or two.

Does RUBS save water?

Less than submetering. A 2004 multifamily study of 32 properties across three states found submetered properties used 18% to 39% less water than properties that built utilities into rent, while RUBS properties used 6% to 27% less. So RUBS is better than burying utilities in rent, but the same study points to why it is weaker than direct metering: a tenant who cuts back still pays a share set by a ratio. The study is old and covers a limited sample, so treat the ranges as directional.

RUBS versus submetering versus including utilities in rent

A 2016 multifamily market survey from a payments software company describes submetering as the most efficient way to recoup utility costs. Keep in mind that it comes from a vendor with an interest in the answer. A 2026 state-by-state guide likewise notes the trend toward submetering, says RUBS is still legal in most states, and advises treating it as transitional. Some states restrict or prohibit it, and Georgia's 2012 rule for new buildings is an example of that direction.

Setting up RUBS the right way

1. Confirm the legal footing. Check the building's permit date, your lease terms and any local utility rules.
2. Choose one formula and keep it. Changing methods mid-year invites complaints.
3. Deduct common areas first. Document how you estimated them.
4. Disclose before signing. Put the method, the billing fee and how to ask questions in the lease or a signed addendum. Our guide to the Georgia Realtors residential lease covers what typically goes into a lease.
5. Bill on a schedule. Same date each month, with the total bill, the deductions and the formula visible.
6. Reconcile. Compare what you collected to what you paid, at least quarterly. Over-collecting is the one error that creates legal exposure.
7. Handle the edges. Write rules for move-ins, move-outs and vacant units.
8. Keep records. Keep utility invoices, calculation sheets and tenant statements for any dispute.

If you also charge other fees, keep them defensible. For example, see how Georgia courts treat late rent fees and what to expect with security deposits.

What RUBS means for your returns

Recovered utilities lift net operating income, and that changes how a lender or buyer sees the property. If you are testing a purchase or a refinance, run the numbers both ways: with and without utility recovery. A DSCR calculator for rental properties is a quick way to see how income and debt payments interact. Be conservative. Count only recovery you can document, since a lender or a regulator may discount income that rests on a formula tenants dispute.

Utility income is also taxable rental income, so see our overview of Georgia landlord taxes and talk to your CPA.

Our perspective on RUBS

We manage residential rentals around Atlanta, and our view is simple: RUBS is a tool, not a profit center. Owners who treat it as a way to recover their actual cost, and who explain it plainly, rarely have trouble. Owners who treat it as extra margin usually do.

What we would tell an investor before buying a building that uses RUBS:

• Ask for twelve months of master utility bills and the current tenant billing records. If the two don't reconcile, price in the risk.
• Check the permit date. A post-July 2012 building is a different conversation under Georgia law.
• Underwrite the property without utility recovery first. If the deal only works with RUBS income, it is a thin deal.
• Make the lease language clear enough that a tenant could rebuild their own bill from it.

The tenants who complain loudest are usually the ones who were not told. Clear communication at lease signing is cheaper than any dispute, and that is how we approach every property we manage.

— Matt

Getting help with utilities, leases and management

Utility billing sits inside a larger set of landlord duties: lease drafting, compliance, rent collection and financial reporting. Our property management service covers that full suite for investors in Atlanta and surrounding areas. Monthly management is listed at 10% per month, with a $250 one-off onboarding fee and a $500 one-off lease renewal fee. The optional Owner Benefit Package is $40 per month per unit. If you are still weighing a purchase or a strategy, our investment consulting sessions start with a 30-minute call at $300.

FAQ

Is RUBS legal in Georgia?

Generally yes for water and wastewater, within limits. Georgia law lets owners charge tenants using equipment or an economic allocation method, as long as the total does not exceed the owner's cost plus a reasonable billing fee and the terms are disclosed before the lease is signed. Newer buildings, permitted on or after July 1, 2012, must be built to allow unit-level measurement. Ask an attorney about your specific building.

How do I calculate RUBS for my building?

Take the master bill, subtract common-area use, then divide the remainder by your chosen basis: square footage, occupants, bedrooms or a blend. Multiply the resulting rate by each unit's share. Add a modest billing fee only if your lease allows it, and confirm the total collected never exceeds what you paid.

Can a landlord add an administrative fee to a RUBS bill?

In Georgia, the statute allows a reasonable fee for establishing, servicing and billing for water and wastewater service. The word reasonable is doing the work, so keep the fee small, disclose it in the lease and be ready to explain it. A fee that looks like a profit margin invites a dispute.

Is RUBS fair to tenants?

It can be, if the formula is transparent and common areas are excluded. It is less fair than measured billing, because a tenant who conserves still pays a ratio-based share. That is why clear disclosure and consistent math matter so much.

Sources

• Georgia Code § 12-5-180.1, Justia
• Attorney General Schwalb alert on how utilities are billed, DC Office of the Attorney General
• WaterSense Labeled Homes Technical Sheet: Water Metering, EPA
• An Introduction to Ratio Utility Billing Systems for Tenant Advocates, NCLC
• Submetering, RUBS, and Water Conservation, NAA and NMHC study
• Utility Management & Conservation Association best practices
• A Property Manager's Guide to Payments, Billing and Utility Management
• Utility Billing Laws by State: 2026 Guide

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