Pool Pump Running but Losing Water? Possible Causes and Solutions

August 7, 2026

If your pool pump is running normally but your pool continues losing water, it is easy to assume the pump is causing the problem. In reality, the pump is often just one part of a larger circulation system where hidden leaks can occur. While some water loss from evaporation is normal—especially during the hot Las Vegas summer—a pool that requires frequent refilling may have a leak that needs professional attention.



Finding the source of the water loss early can help prevent higher water bills, unnecessary chemical use, equipment damage, and costly repairs. Hound Dog Leak Detection specializes in locating hidden pool leaks using advanced diagnostic equipment and proven testing methods.

Infinity pool overlooking a desert valley and mountains under a clear sky

Is It Evaporation or a Leak?

Every swimming pool loses some water through evaporation. High temperatures, low humidity, wind, and heavy pool use can all increase water loss.


However, if your water level drops noticeably every few days or you find yourself constantly adding water, the loss may be greater than normal evaporation. A simple bucket test can provide a general indication of whether your pool may have a leak, but it cannot identify where the leak is located.


If excessive water loss continues, a professional inspection is often the next step.


Hidden Plumbing Leaks

Many pool leaks occur underground in the plumbing system.


Water travels through a network of pipes connecting the pool to the pump, filter, heater, and other equipment. Over time, fittings, joints, or underground pipes can develop leaks that allow water to escape whenever the system is operating.


Because these leaks are hidden beneath concrete or landscaping, they usually cannot be found through a simple visual inspection.


Equipment Can Leak Too

Not every leak is underground. Pool pumps, filters, valves, and other equipment contain seals and connections that can wear with age.


Sometimes these leaks only occur while the circulation system is running, making them difficult for homeowners to notice. A professional inspection includes the entire equipment pad as well as the pool itself to ensure every potential leak source is evaluated.


Using Dye to Locate Structural Leaks

If the plumbing system appears to be functioning properly, technicians may perform a dye test.


A specialized dye is placed near suspected leak locations, including cracks, skimmers, return fittings, lights, and other penetrations in the pool shell. If water is escaping, the dye is drawn toward the leak, allowing technicians to pinpoint the exact location.


This simple but effective technique helps identify structural leaks that may not be visible during a routine inspection.


Leakalyzer Technology Provides Accurate Measurements

Hound Dog Leak Detection also uses the Leakalyzer® Rapid Water Loss Sensor, an advanced electronic device designed to measure very small changes in water level.


The Leakalyzer helps determine whether water loss is consistent with normal evaporation or indicates an active leak. When combined with isolation testing and dye testing, it provides valuable information that allows technicians to diagnose pool leaks accurately and efficiently.


Get Answers Before Water Loss Becomes a Bigger Problem

If your pool pump is running but your water level continues to drop, do not assume it is simply evaporation. Hidden plumbing leaks, equipment failures, or structural issues may all contribute to ongoing water loss.



Hound Dog Leak Detection provides professional pool leak inspections throughout the Las Vegas area using advanced diagnostic tools, including isolation testing, dye testing, and the Leakalyzer® Rapid Water Loss Sensor. Our experienced team accurately identifies the source of the leak so repairs can be made efficiently, helping protect your pool, equipment, and investment.

Signs Your Pool Equipment Has a Hidden Leak: Pumps, Filters, Valves, and Plumbing Issues

October 27, 2026
When a swimming pool starts losing water, many homeowners immediately look for a crack in the pool shell. But the source may be somewhere else entirely. Pumps , filters, valves, fittings, and underground plumbing can all develop leaks. Some only lose water while the circulation system is running, and in Las Vegas , small amounts of water around an equipment pad can evaporate before an obvious puddle ever forms.  That makes changes in equipment behavior especially important to notice.

Pool Leaks in Older Pools: Common Problems and What Homeowners Should Watch For

October 20, 2026
Older pools can remain enjoyable and functional for decades, but age can introduce problems that are not always obvious from the surface. Plumbing connections can weaken. Seals can deteriorate. Equipment can develop small leaks. Cracks may form around structural penetrations, and older repairs can begin to fail. In Las Vegas , where heat, evaporation, and constant circulation already place stress on pool systems, those age-related issues can make leak detection more complicated.  Knowing what to watch for can help homeowners recognize when normal aging has turned into actual water loss.

Why Your Pool Water Level Keeps Dropping After Adding More Water

October 16, 2026
If you keep adding water to your pool only to watch the level drop again, it is easy to blame evaporation. In Las Vegas, evaporation can be significant , especially during hot, dry, windy weather. But when the water level repeatedly falls faster than expected, there may be another cause. A leak can occur in the pool shell, plumbing, equipment, or attached spa. The key is recognizing when normal water loss has crossed into something that deserves professional testing.

Signs Your Pool Equipment Has a Hidden Leak: Pumps, Filters, Valves, and Plumbing Issues

October 7, 2026
Not every pool leak starts in the pool shell . Some of the hardest leaks to spot begin around the equipment pad, inside plumbing lines, or at components that only leak while the system is running. In Las Vegas, where water can evaporate quickly, a small equipment leak may disappear before it ever forms an obvious puddle.  That makes it important to pay attention to changes in water level, pump performance, pressure, and equipment behavior.

Pool Leak Prevention Tips: How Regular Maintenance Can Protect Your Investment

September 29, 2026
A swimming pool is a major investment , and small maintenance problems can become expensive when they go unnoticed. In Las Vegas and throughout Southern Nevada, heat, evaporation, aging equipment, plumbing stress, and constant circulation all put pressure on pool systems. Regular maintenance cannot prevent every leak, but it can make it easier to catch warning signs before water loss becomes severe.  Paying attention to water level, equipment condition, plumbing, and surface changes can help protect both the pool and the property around it.

Why DIY Pool Leak Fixes Often Fail and When to Call a Leak Detection Specialist

September 22, 2026
A dropping pool water level can tempt homeowners to try a quick fix. Adding sealant, tightening a fitting, replacing a gasket, or patching a visible crack may seem like an easy way to solve the problem. Sometimes a simple repair does work. The difficulty is that the visible symptom is not always the true source of the leak. Pool systems contain plumbing lines, fittings, skimmers, drains, lights, equipment, and structural components that can all lose water in different ways. That is why DIY repairs often fail when the source has not been identified first.

Can a Small Pool Leak Damage Your Pool Structure or Equipment?

September 21, 2026
A small pool leak may not seem urgent. If the water level drops slowly, it can be tempting to simply add more water and assume the problem can wait.  Unfortunately, even a relatively small leak can create larger problems when it continues over time. Water escaping from a pool shell, plumbing line, fitting, skimmer, or equipment connection does not simply disappear. It can move into the surrounding soil, interfere with water chemistry, and affect how pool equipment operates. In Las Vegas, where homeowners already expect some water loss from evaporation, distinguishing normal evaporation from an actual leak is especially important.

Swimming Pool Leak Detection in Las Vegas: Why Local Experience Matters

September 8, 2026
Pool water loss in Las Vegas can be difficult to interpret. High temperatures, low humidity, wind, heavy pool use, and normal evaporation can all cause the water level to drop. At the same time, an actual leak can quietly waste significant amounts of water if it is not identified.  That is why local experience matters. A leak detection specialist who understands Southern Nevada conditions is better positioned to separate normal environmental water loss from patterns that deserve further testing.

How to Check for a Pool Leak Before Calling a Professional

September 1, 2026
Pool water levels naturally rise and fall, especially in Las Vegas. Heat, wind, low humidity, splashing, and normal evaporation can all cause water loss. However, if you find yourself repeatedly adding water to the pool, notice an unexplained increase in your water bill, or receive a continuous-flow notification from your water provider , a leak may be worth investigating.  Before calling a professional, homeowners can perform several simple checks that may help determine whether the water loss appears normal or whether professional pool leak detection is the next step.

How the Leakalyzer Helps Hound Dog Leak Detection Find Pool Leaks Faster

August 25, 2026
When a swimming pool is losing water, the first question is not always “Where is the leak?” Before searching plumbing lines, fittings, lights, skimmers, or the pool shell, it is important to determine whether the pool is actually losing water at an abnormal rate.  Hound Dog Leak Detection uses the Leakalyzer® Rapid Water Loss Sensor as part of its diagnostic process throughout Las Vegas and Southern Nevada. The device provides precise, real-time information about water loss, helping technicians confirm whether a leak exists and develop a more focused plan for locating and addressing it.