A pool that loses more than about a quarter- to three-eighths of an inch of water per day, after accounting for normal Las Vegas evaporation, most likely has a leak rather than simple heat loss. The fastest way to confirm this at home is the bucket test, which compares water loss inside a bucket to loss in the pool over 24 hours; if the pool drops noticeably more than the bucket, water is escaping through a crack, fitting, or plumbing line instead of evaporating into the desert air. Simple leaks at a skimmer or return fitting often run $150-450 to repair, while underground plumbing leaks requiring excavation can run $1,500-4,000 or more, so pinpointing the leak’s location before calling a contractor can save real money.

Signs Your Pool Has a Leak, Not Just Evaporation

Las Vegas summers push normal evaporation to roughly a quarter- to three-eighths of an inch per day because of heat, wind, and very low humidity, so losing water at that rate alone isn’t a red flag. Watch instead for water loss beyond that range, wet or unusually green spots in the yard near the pool or equipment pad, cracks forming in the surrounding decking, a water bill that rises without you having added significant makeup water, air bubbles spitting from return jets, and chemical demand that won’t stabilize no matter how carefully you dose, since fresh, untreated water constantly diluting the pool will keep throwing off your readings.

The Bucket Test: Step-by-Step

Fill a 5-gallon bucket with pool water to within an inch of the rim and set it on a pool step so it’s submerged a few inches into the water. Mark the water level on the inside of the bucket and the water level of the pool itself, ideally at the skimmer or a piece of tile, with waterproof tape or a grease pencil. Turn off any auto-fill device so it doesn’t mask real water loss. Run the pump on its normal daily schedule and wait 24 hours. Compare the two marks: if the pool’s level dropped noticeably more than the level inside the bucket, you have a leak; if the drops are roughly equal, what you’re seeing is ordinary evaporation. Repeating the test with the pump switched off for another 24 hours helps narrow things further, since a leak that only shows up with the pump running usually points to pressure-side plumbing, while one that persists regardless of pump status points toward the shell, skimmer, or suction-side lines.

Professional Detection Methods

Once the bucket test confirms a real leak, professionals typically use a combination of methods to pinpoint it. Pressure testing isolates each plumbing line, pressurizes it with air, and watches for pressure loss to identify which specific line is compromised. Dye testing involves releasing colored dye underwater near a suspected crack, fitting, or light niche; if a leak is present, the dye visibly streams into it. Electronic leak detection uses amplified listening equipment to pick up the sound of water escaping through underground pipes, which is especially useful for slab leaks that aren’t visible. For pools with suspected structural cracks, a diver or underwater camera inspection may also be used. A full combined leak detection visit in the Las Vegas and Henderson area typically costs $300-600, and many companies apply that fee toward the repair if you move forward with them.

Typical Repair Costs by Leak Location

Costs vary considerably by where the leak actually is. A skimmer or return fitting leak generally runs $150-450 to repair. A pool light niche or its conduit typically costs $200-500. A liner tear or a cosmetic plaster crack can often be patched for $100-400, though a larger structural crack can run $2,000 or more. Underground plumbing leaks that require excavation are the most expensive, typically $1,500-4,000 or higher depending on the number of lines and how deep or far the damaged section runs. Equipment pad leaks, such as a worn pump seal, filter o-ring, or heater fitting, are usually the least expensive to fix at $75-300. In every case, an upfront $300-600 leak detection visit is what narrows down which of these categories you’re actually dealing with before any repair work begins.

When to Call a Pro vs. DIY-Diagnose First

Start with the bucket test and a visual walk-around of the pool, decking, and equipment pad; both are free and typically take 24-48 hours to produce a clear answer about whether you’re dealing with evaporation, an equipment-side leak, or something in the shell or plumbing. Call a professional once the bucket test confirms water loss beyond normal evaporation, especially if you notice visible cracks, if the water keeps disappearing even with the pump off, or if a quick dye test near obvious suspect areas doesn’t turn up an answer within a reasonable effort. Waiting too long on a confirmed leak tends to make things worse and more expensive, since continued water loss can undermine decking, erode soil around plumbing, and let a small crack grow under pressure.

If the bucket test points to a real leak, 702Pools can run a full pressure, dye, and electronic leak detection visit and give you a straightforward repair estimate before any work begins. Call (702) 840-1001 or email service@702pools.com to schedule a free 30-point pool inspection. Browse more local questions on our Pool Service FAQs page, or if a leak has also been throwing off your water chemistry, see how each sanitizing system responds to dilution in our comparison of saltwater vs. chlorine pools in Las Vegas.