Water submeter billing for commercial tenants
How to recover a shared water bill from commercial tenants with submeters: reading meters, units, cost-per-gallon math, common-area water, and leak checks.
On many small strip centers and older office buildings, the city sends one water and sewer bill for the whole property, and the owner pays it. If the leases let you recover it, the fairest way is usually by submeter: a small meter on each tenant's line, read on a schedule, with the bill shared by actual usage. Done casually, submeter billing turns into estimated readings, missed rollovers, and a restaurant that disputes every invoice. Done with a routine, it is twenty minutes a month and an expense line you stop absorbing. This guide walks through the method with a worked example. It is general information, not legal or tax advice.
WHERE COMMON-AREA WATER GOES
Recovering common-area water through CAM?
Check the lease's recoverable categories first, then run one tenant's share through the reconciliation with a cap applied.
01 / 09
Why a shared water bill becomes an owner cost by default
When there is one master meter and no allocation method, water quietly becomes an owner expense, or it gets folded into CAM and spread by square footage. Square footage is a poor proxy for water. A 1,200-square-foot restaurant or salon can use many times the water of a 3,000-square-foot insurance office, and spreading the bill by area means the office subsidizes the restaurant.
Usage-based billing fixes the fairness problem and gives every tenant a reason to report a running toilet. It also gives you something CAM spreading never will: an early warning when one suite's usage jumps.
02 / 09
Three ways to allocate a shared water bill
Most small commercial owners land on one of three methods. Which one you can use depends first on what your leases say.
Key points
- Submeter: read each tenant's meter and share the bill by actual usage; the fairest and most defensible
- Ratio or square footage: allocate by area or a fixed percentage; simple, but blind to usage
- Fixed rate per unit: bill each tenant's metered usage at a set rate, such as $8.50 per 1,000 gallons
- Track only: read the meters for leak detection and pay the bill yourself
03 / 09
Check the lease and local rules before you bill
You can only recover water the lease lets you recover, by the method the lease describes. Some leases say tenants pay utilities “separately metered or submetered to the premises”; others put water in operating expenses; some gross leases include it in rent. If a lease is silent, adding a new water charge mid-term usually needs the tenant's agreement.
Some states and water utilities also regulate how a property owner may resell or allocate water, including how the charge is calculated and what the tenant must be shown. Most of those rules are written with apartments in mind, but they vary, so confirm with your attorney or the local utility before you start billing commercial tenants.
04 / 09
Meters, units, and multipliers
Before the first reading, write down three facts for every meter: what it serves (a tenant, the common area, or the utility's main house meter), the unit printed on its face, and its multiplier. Units are the most common source of error. Utilities often bill in CCF, which is 100 cubic feet or about 748 gallons, while a submeter may read in gallons or cubic feet.
Some meters display a number that must be multiplied, say by 10, to get actual usage; the multiplier is usually printed on the dial. And every mechanical meter eventually rolls over: when it passes its highest number, the next reading is lower than the last one. Treat any ending reading lower than the beginning as a rollover or a replaced meter, never as negative usage.
05 / 09
A reading routine that holds up in a dispute
Read every meter on the same day, as close as possible to the date the utility reads the main meter, so your usage and the bill cover the same period. Take a photo of each dial. Carry forward each period's ending reading as the next period's beginning, so a reading is never typed twice.
Key points
- Read on a fixed day each month or quarter, matched to the utility's cycle
- Photograph every dial, with the meter label in frame
- Compare each meter to its own recent average before billing
- Send each tenant beginning, ending, usage, and the rate or share
06 / 09
Worked example: one month at a five-meter center
A fictional center has a main house meter and four tenant submeters, all reading in gallons. The utility bill for the month is $1,860 for 248,000 gallons on the main meter, so the cost is $1,860 ÷ 248,000 = $0.0075 per gallon, or $7.50 per 1,000 gallons.
The tenant meters read: restaurant 96,000 gallons, salon 38,000, nail bar 30,000, dental office 22,000. That is 186,000 gallons of tenant usage. The charges are $720 (restaurant), $285 (salon), $225 (nail bar), and $165 (dental), for $1,395 in total. The remaining 62,000 gallons is common-area use (irrigation, restrooms, leaks before the tenant meters) and costs $465. The tenant charges and the common area add up to the full $1,860 bill.
Under a square-footage split, the dental office, the largest suite, would have paid the most. Under submetering it pays the least, which is both fairer and easier to defend.
07 / 09
Common-area water and the CAM question
The difference between the main meter and the sum of the tenant meters is common-area water. Whether you can recover it depends on your leases' operating-expense or CAM definitions. If the leases allow it, it belongs in the CAM pool as a water and sewer expense, shared by pro-rata share; if not, it is an owner cost. Either way, keep it separate from the tenant submeter charges so no gallon is billed twice.
Watch the common-area number over time. If it climbs while tenant usage stays flat, look for an irrigation leak or a failing main-line fitting before the next bill.
08 / 09
Leaks, estimates, and tenant questions
A sudden jump in one meter, for example more than three times its usual reading, is usually a leak, a stuck valve, or a misread. Check the photo, re-read the meter if needed, and call the tenant before you bill a spike; a running fixture found in week one costs far less than one found at the next reading.
When a tenant asks about a charge, the photo, the beginning and ending readings, and the bill math answer most questions in one reply. Avoid estimated readings; if a meter cannot be read, say so on the notice and true it up with the next actual reading.
09 / 09
Where TenantPoint fits
TenantPoint's Water screen handles this routine for each property. You add each meter with what it serves, its unit, multiplier, and monthly or quarterly cycle. Readings can be typed or captured from a phone photo, or collected by a no-login reading link you send to a tenant or maintenance person; nothing submitted by link counts until you accept it. Rollovers and replaced meters are handled, and an unusually high reading is flagged as a possible leak.
Recovery is optional: the default is track only. If you choose to recover, you pick a share of the actual bill by usage or a fixed rate per unit, review each tenant's charge, and create the charges, which then appear on the tenant's balance and a notice is drafted to your outbox for you to send. Common-area water can be added to CAM as a water and sewer expense if your leases allow it; it is never added automatically.
FAQ
Frequently asked questions
Can I bill commercial tenants for water if the lease doesn't mention it?
Usually not mid-term without the tenant's agreement. Check the utilities and operating-expense clauses first; if the lease is silent or treats water as included in rent, talk to the tenant and your attorney before adding a charge.
How many gallons are in a CCF?
One CCF is 100 cubic feet, which is about 748 gallons. Many water utilities bill in CCF while submeters often read in gallons, so convert before you compare.
How often should submeters be read?
Monthly or quarterly, on the same day each period and as close as possible to the utility's own read date, so tenant usage and the bill cover the same days.
Who pays for common-area water?
It depends on the lease. If the CAM or operating-expense definition includes common-area utilities, it is typically recoverable through CAM by pro-rata share; otherwise it is an owner expense.
What about sewer charges?
Many utilities base sewer charges on metered water use, so sewer is often recovered the same way as water. Confirm how your utility bills it and what your leases allow.
Free template
Get the CAM reconciliation worksheet
The spreadsheet version: recoverable pool, each tenant's share, caps, proration, admin fee and the true-up balance. Comes with the reconciliation and audit checklists.
- CAM reconciliation worksheetSpreadsheet template
- CAM Reconciliation ChecklistPrintable checklist
- CAM Audit Checklist for Landlords and TenantsPrintable checklist
Put it into practice
TenantPoint handles this workflow in CAM reconciliation software and Commercial rent collection software. See all TenantPoint solutions or how it compares with other software.
This educational material is not legal, accounting, tax, or investment advice. Review controlling lease language and consult qualified professionals when appropriate.
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