How-to MeterEase blog

How to split a water bill between tenants

By MeterEase · Published October 15, 2026

If your building has one water meter and several tenants, the utility sends you one bill. You can absorb it, build it into rent, or bill it back. If you bill it back, you need a method that is written down, repeatable and easy for a tenant to check. This guide walks through that, start to finish, with example numbers.

Short answer: pick one formula (square footage, occupants, bedrooms, fixed percentages, or a blend), write it into the lease, decide what happens to vacant units, then each month divide the bill by that formula and send each tenant their share with the math and the bill attached.

Step 1: Check that you are allowed to bill water back

Before any math, confirm two things. First, your lease has to say that tenants pay a share of water and how it is calculated. A tenant who signed a lease that says “water included” is not suddenly on the hook because you start sending bills. Second, some states, cities and water utilities set rules on how a landlord can charge for water in a master-metered building. Our state-by-state guides link the statutes and agency pages we found for each state we cover, and point out where the rules are thin. This is general information, not legal advice.

Step 2: Decide what goes into the split

A water bill is usually more than water. Look at the line items before you divide anything:

Usage charges for the gallons (or hundred cubic feet) the building used.
Fixed or service charges that you would pay even if the building were empty.
Sewer, which is often billed off water use, and sometimes trash or stormwater on the same bill.
Late fees or penalties from paying late. Most landlords leave these out, because they are not something tenants caused.

Decide which lines you are passing through and say so in the lease. Many landlords split the whole bill except late fees. Others split only usage and keep the service charge. Either can work; the important part is doing it the same way every month.

Step 3: Pick a method

Here are the four common methods, each with the same made-up bill so you can compare. Example: a $480 water and sewer bill for a three-unit building.

Unit	Sq ft	Occupants	Bedrooms
A	600	1	1
B	900	2	2
C	1,500	3	3

By square footage. Total is 3,000 sq ft. Unit A pays 600 ÷ 3,000 × $480 = $96. Unit B pays $144. Unit C pays $240. Simple and stable, because square footage never changes. The weak spot: a single person in a large unit pays for space, not showers.

By occupants. Total is 6 people. Each person’s share is $480 ÷ 6 = $80, so A pays $80, B pays $160, C pays $240. This tracks water use more closely, since people use water and rooms do not. The weak spot: you have to know who lives there, and that changes.

By bedrooms. Total is 6 bedrooms, which happens to give the same result as occupants here: $80, $160, $240. Bedrooms are fixed like square footage but follow likely household size a bit better.

By fixed percentages. You set the shares in the lease, for example 20% / 30% / 50%, which gives $96 / $144 / $240. Easy to explain, but you should be able to say where the percentages came from.

Blended. Some landlords weight two factors, such as 50% square footage and 50% occupants. Unit A would pay half of $96 plus half of $80 = $88. Blends feel fairer to some tenants but are harder to explain. If you use one, show the math every time.

Want to try your own numbers? The free RUBS calculator does all of these, and our square footage vs occupants guide goes deeper on choosing.

Step 4: Decide on vacant units

This is where most disputes come from. Suppose Unit B is empty for the month. You have two choices:

Owner pays the vacant share. Keep Unit B in the formula and pay its $144 yourself. Units A and C pay exactly what they would have paid anyway.
Split among occupied units only. Drop Unit B and divide $480 across A and C. By square footage, A now pays 600 ÷ 2,100 × $480 = $137.14 and C pays $342.86.

Option 1 is the one most tenants will accept, because an empty unit next door does not raise their bill. Whatever you choose, put it in the lease.

Step 5: Handle move-ins and move-outs

When a tenant is in the unit for only part of the billing period, prorate their share by days. If the bill covers 30 days and the tenant moved out on day 12, they owe 12 ÷ 30 of their unit’s share. We cover this in detail in how to handle utilities when a tenant moves out mid-month, and the move-out proration calculator does the math.

Step 6: Send each tenant a clear bill

A good tenant bill has:

The billing period and the utility’s total.
The method, in one sentence (“split by square footage”).
Their unit’s number in that method and the building total (600 of 3,000 sq ft).
The math (600 ÷ 3,000 × $480 = $96).
A copy of the master bill, or a link to it.
When and how to pay.

Showing the math is what keeps questions short. A tenant who can see 600 ÷ 3,000 × $480 rarely argues the arithmetic. Our tenant utility bill template gives you a layout to copy, and the bill-back letter generator writes the cover letter.

Step 7: Watch for spikes

Because tenants share the bill, a leak in one unit raises everyone’s share. The U.S. EPA’s WaterSense program says the average household’s leaks can waste more than 9,300 gallons a year, and that a faucet dripping once per second can waste more than 3,000 gallons a year. When a bill jumps, check toilets and irrigation first, and tell tenants what you found. If the leak was a building problem, consider covering the extra yourself. We wrote a separate post on answering “why is my utility share so high?”.

A monthly routine that holds up

Once the method is set, the monthly job is short:

Get the bill and confirm the dates and total.
Mark who was in each unit during the period.
Apply the method and vacancy rule.
Check that the shares add back up to the amount you are billing.
Send each tenant their share with the math and the bill.
Keep a copy of everything.

You can do this in a spreadsheet. If you would rather not, MeterEase reads the bill PDF, applies your method and vacancy rule, and emails each tenant their share with the math shown, after you review it. Plans start at $14 a month; see pricing.

Split the bill and email every tenant in minutes

MeterEase reads the master bill PDF, applies your method and vacancy rule, and emails each tenant their share with the math shown and the source bill attached, after you check the numbers. Plans start at $14/month.

Sources

Example numbers in this post are made up to show the math. This post is general information, not legal advice; rules differ by state, city and utility. Check your lease and local rules.