What Records Should You Keep Before Hiring a Pool Leak Detection Company?

Consider the following scenario: Your pool keeps losing water, you have already added hundreds of gallons, and you are finally ready to call a leak detection company. The technician asks when the problem started, how much water disappears each day, and whether the loss changes when the pump runs. Suddenly, you realize you have been watching the problem for weeks without recording the details that could help explain it. A few simple records collected before that appointment can make the investigation more focused, help you communicate clearly, and give you a better basis for evaluating the company's findings.

You do not need professional testing equipment or a complicated spreadsheet. A notebook, a few photographs, and some basic observations can provide useful information. The key is recording what actually happens rather than trying to diagnose the leak yourself.

Start With a Dated Pool Water Loss Log

The most valuable record is usually a timeline showing how quickly your pool loses water. Instead of telling a technician that the level drops a lot, document approximately how far it falls over a consistent period.

Choose a fixed reference point, such as a tile grout line or a clearly identified point near the skimmer opening. Record the water level at roughly the same time each day. If possible, measure the vertical change in inches rather than estimating by appearance.

For each observation, include:

• The date and time of the measurement.
• The starting and ending water levels.
• Whether the circulation pump was operating normally.
• Any water added to the pool during that period.
• Rainfall, unusually windy conditions, or heavy pool use.
• Whether the automatic water filler was active.

Even three to five days of consistent observations can be more helpful than several weeks of vague recollections. If the pool is losing water rapidly, however, do not delay professional assistance merely to collect a longer history.

Keep Your Evaporation Test Results

Before assuming that every disappearing inch represents a leak, consider evaporation. Hot weather, low humidity, wind, heated water, and uncovered pool surfaces can all contribute to water loss.

A bucket comparison provides a practical starting point. The idea is to compare the drop in water level inside a container with the drop in the surrounding pool over the same period. A pool that loses noticeably more water than the comparison container may warrant further investigation.

The Mini Bucket Test is a simple first-step tool that can help compare normal evaporation with possible leak-related water loss. It does not prove a leak exists or reveal its location, but recording the results can help you explain why you decided to contact a professional.

Write down the test date, duration, weather conditions, pump status, and water-level differences. If rainfall, splashing, or automatic filling interfered with the comparison, note that limitation rather than treating the result as conclusive.

Document Whether Water Loss Changes With the Pump Running

One detail pool leak technicians often ask about is whether water disappears faster while the circulation system operates.

Different patterns can suggest different areas to investigate:

• Greater loss while the pump runs: This may raise suspicion about pressurized return plumbing, certain equipment connections, or features operating under pressure.
• Greater loss while the pump is off: This can sometimes point toward suction-side plumbing or other components whose behavior changes when circulation stops.
• Similar loss under both conditions: The technician may also investigate the pool shell, fittings, light niches, or plumbing that remains exposed to water pressure regardless of pump operation.

These are clues, not rules. For example, a suction-side plumbing problem might draw air into the system while the pump runs and leak water when the pump stops. Multiple problems can also exist simultaneously.

Record normal pump schedules, variable-speed settings, and any noticeable differences in water loss. Do not operate equipment without adequate water or change valve positions simply to perform an experiment. Ask a pool professional before attempting a pump-off test if you are unsure whether it is safe.

Photograph Water Levels, Equipment, and Suspicious Areas

Photographs preserve details that are easy to forget. They also establish what the pool and surrounding area looked like before testing or repairs began.

Take pictures that clearly show the pool waterline against a recognizable reference. Include a wider image showing where that reference is located.

Other useful photographs include the equipment pad, visible plumbing connections, valve positions, damp areas near the deck, cracks, loose fittings, and unusual staining around the pool.

If a wet spot repeatedly appears beside the equipment pad, photograph it on different days. Include notes about recent rain, irrigation, and filter cleaning so ordinary drainage is not mistaken for leak evidence.

For attached spas, take separate waterline photographs. A spa that drains down to pool level overnight may involve a different issue, such as a check valve that allows water to flow back toward the pool, rather than water escaping from the overall system.

Save Repair Invoices and Recent Maintenance Records

A pool's recent history can be surprisingly relevant. A new leak complaint sometimes follows work that changed plumbing connections, seals, equipment operation, or the surrounding ground.

Gather invoices and service notes for recent pump replacements, filter installations, heater work, plumbing repairs, resurfacing, tile repairs, skimmer replacement, or deck construction.

Note when the work occurred and whether unusual water loss appeared before or afterward. The timing does not prove that a contractor caused the problem. It simply gives the leak detection specialist useful context.

If previous technicians identified possible leaks, save their written findings, pressure-test results, photographs, and repair recommendations. A specialist may be able to avoid repeating some preliminary work or identify why an earlier repair did not resolve the symptoms.

Track Automatic Filling and Water Bills

An automatic pool filler can hide significant water loss by continuously replacing water as it disappears. The pool may look perfectly normal even while the household uses considerably more water than expected.

Record whether your pool has an autofill system and whether you have noticed it operating more frequently. If you have a dedicated pool water meter, its readings may provide additional context.

Keep recent utility bills when they show an unexplained increase in usage. Remember that irrigation, household plumbing problems, seasonal changes, and other activities can also increase consumption.

Do not rely on the overall water bill to measure pool leakage precisely. Treat it as supporting information rather than a substitute for water-level observations.

Record the Lowest Level Where Water Loss Seems to Stop

This is one of the most useful details homeowners sometimes overlook.

Suppose a pool repeatedly loses water until the level approaches the bottom of the skimmer opening, then appears to stabilize. That pattern may encourage a technician to examine the skimmer area, nearby fittings, or plumbing associated with that elevation.

Similarly, a pool that consistently stops dropping near a particular tile joint, return fitting, or light assembly may provide a location-related clue.

The stopping point is not definitive proof of where the leak exists. Plumbing configurations, groundwater conditions, evaporation, and water movement can complicate the pattern.

Never intentionally let the pool drain below safe operating levels to find its stopping point. Low water can damage pumps, affect pool surfaces, and create other problems. If you have already observed a low-water condition, photograph it and notify the technician before refilling according to their instructions.

Include Weather, Pool Use, and Water Feature Activity

A water-loss record becomes more meaningful when it includes what was happening around the pool.

Was there a windy weekend? Did several children spend hours splashing? Was the spa heater running? Did the waterfall operate longer than usual?

These details matter because water can disappear through evaporation, splash-out, overflow, and water features without necessarily escaping through a damaged pipe or pool surface.

Pay particular attention to raised spas, fountains, waterfalls, tanning ledges, and attached spillways. A water feature might only leak while operating, or water may escape from a poorly directed spillway into landscaping rather than returning to the pool.

For pools with covers or screen enclosures, record whether those features were in use. They can change exposure to wind, sunlight, and other conditions that influence evaporation.

Prepare Questions and Get the Testing Scope in Writing

Good preparation is not limited to documenting the pool. You should also understand what the company plans to inspect and what you will receive afterward.

Before hiring, ask whether the quoted service covers the pool shell, skimmer, fittings, equipment pad, and underground plumbing, or whether some areas require additional charges. Ask how the company handles attached spas and water features.

Clarify whether the inspection fee includes a written report, photos of findings, recommended next steps, or any necessary follow-up testing. Find out whether repairs are included or quoted separately.

Request written pricing and ask about any limitations, cancellation terms, or return-visit policies. Keep copies of the estimate, appointment confirmation, and correspondence.

A clear scope helps distinguish a diagnostic visit from an actual repair commitment and reduces the chance of misunderstandings later.

Common Record-Keeping Mistakes to Avoid

Keep the records simple enough that you will actually use them. A dated note reading 'Pool dropped about 1/4 inch overnight; pump on normal schedule; no rain; no swimming' is more useful than an elaborate chart filled with uncertain estimates.

What Should You Send the Leak Detection Company First?

You do not need to email dozens of photos before the initial call. Start with a short summary describing when the problem began, the approximate water-loss rate, whether evaporation testing suggests excess loss, and any unusual equipment or water-feature behavior.

Attach two or three relevant photographs and mention any recent repairs. Ask the company which additional records would help before the appointment.

Keep the pool at its normal operating level unless the specialist gives different instructions. Do not drain it, disassemble equipment, or attempt invasive repairs before the investigation.

The Bottom Line: Better Records Make a Better Starting Point

Hiring a pool leak detection company is easier when you can explain what has happened, when it happened, and under what conditions. Water-level logs, evaporation comparisons, photos, pump observations, maintenance history, and written estimates create a clearer picture than memory alone.

These records will not replace professional testing or guarantee a faster diagnosis. They can, however, help the technician prioritize possibilities, reduce confusion, and give you a reliable record to compare with the final findings.

Start documenting the water loss as soon as you notice a recurring problem. If the pool is dropping rapidly, equipment is drawing air, or the water is approaching an unsafe level, seek professional guidance promptly rather than waiting to complete every item on your checklist.