How to Compare Pool Operating Costs Across Your Sites

Compare similar pools over the same period. Look at spending alongside chemical use, water loss, closures, and staffing gaps, then investigate differences before calling them waste.

Start with the decision the comparison should help you make. You might be reviewing a supply order, unexplained water loss, or repeated uncovered shifts. Each question needs its own records.

Which pools should you compare?

Group sites by the features that matter to the question. For a chemical review, list the product used, pool size, opening hours, and swimmer activity. For a staffing review, start with the coverage each facility needs under its own operating plan.

Do not force unlike sites into the same group just to rank every pool. A quiet apartment pool and a busy lesson pool may have different needs. Write down differences you cannot account for yet.

Never treat a low-cost site as the model if its treatment or staffing falls short of code. For example, the CDC's 2024 Model Aquatic Health Code (MAHC) sets minimum free chlorine levels (5.7.3.1.1.2). Where lifeguards are used, it also requires every zone to be staffed during operation (6.3.4.3.1). Use whatever version your state adopted.

What records belong in the comparison?

Choose a start and end date, then use that period for every site. Keep bills separate from records of use. A delivery purchased during the period may still be sitting in storage at the end.

Build a small review table:

Area	Records to bring together
Chemicals	Product, amount used, price, and opening and closing stock
Water	Meter readings, added water, loss notes, and service work
Closures	Start, end, reason, and response
Staffing gaps	Required post, uncovered time, and action taken
Context	Opening days, hours, activity, and missing information

Keep units visible. Do not compare a count of containers with gallons, or different product strengths as though they were the same. Ask a trained operator or supplier for help when records do not line up.

Where you have older months, use them to compare the same season across years.

Our guide to managing multiple pool sites explains how to keep open issues visible while you gather the details.

How can the same daily cost produce different monthly totals?

Take two illustrative pools, A and B, over the same month, with chemical costs worked out the same way.

Example	Chemical cost	Days open	Cost per open day
Pool A	1,200 dollars	20	1,200 ÷ 20 = 60 dollars
Pool B	1,440 dollars	24	1,440 ÷ 24 = 60 dollars

Pool B's total is higher by 1,440 − 1,200 = 240 dollars. But its cost per open day is the same in this example. The monthly total alone does not show that Pool B wastes chemicals.

To check a difference, divide each pool's chemical cost by its open days. Then check opening hours, swimmer counts, products and pool size before drawing a conclusion. A daily average can still hide missing records or a bad day.

How should you review water loss and closures?

Keep a water loss question separate from a high water bill. EPA WaterSense's pool water efficiency page lists evaporation, pool cleaning, leaks and splashing as ways pools use water. The same page says pool covers can cut evaporation. A bill alone cannot tell you which source explains the difference. Our leak detection guide covers how to check.

For your comparison, mark whether a number measures water added or a change in the pool level. They are different measurements. Ask for missing context rather than combining them into a single total.

For closures, compare both time and reason. Note whether the whole pool or only one area closed. Group reasons the same way at every site, such as water chemistry, staffing, weather, equipment and contamination. Under the MAHC, things like free chlorine below the minimum, pH below 6.5 or above 8.0, or a pool bottom you cannot see require closing (6.6.3.1 and 6.6.3.2). A site with many chemistry closures may need a water review, not just a cost review.

Avoid guessing lost income from closure hours. Use actual refunds or charges, and label any estimate clearly.

How should you use staffing comparisons?

Define each required post from the facility plan and training standards before you count gaps against it.

Review why coverage was missing and what the manager did. Do not reward a lower wage total without checking whether the required posts were covered. If a post could not be filled, the record should show whether that area was closed.

What should happen after you find a difference?

Then sort each difference:

• Difference explained by size, hours or swimmers: note it and move on.
• Difference not explained, records complete: assign one person to check it, with a follow-up date.
• Records missing: fix the record first, then compare again.

Save the original comparison so you can explain later what changed. A high number is a reason to look closer, not proof that someone did a poor job.

Poolean's benchmarks compare a pool with similar pools on chemical use, water loss, closures and staffing gaps, and show which sites cost more than they should. Then check why, using the rule above. See the oversight features or book a 30-minute call.

The short version

• Compare similar sites over matching periods.
• Keep spending, amounts used, and stock changes separate.
• Show the math and use your own records for each calculation.
• Check the reason behind a difference before acting on it.
• Keep required treatment and staffing at the center of any cost review.