Evaporation or a Pool Leak? A Palmdale Homeowner’s Guide to Water Loss

Palmdale pool owners are used to adding water during summer. With temperatures reaching 110°F or higher, low humidity, strong winds, and intense desert sun, evaporation can remove a surprising amount of water from an uncovered pool. However, a pool that needs constant refilling may have more than normal evaporation. It could be losing water through a plumbing line, shell, fitting, equipment pad, or structural crack.

The challenge is telling normal evaporation apart from leak-related water loss. Both can happen at the same time, and the dry Antelope Valley climate can make a small leak appear much worse. As a local pool contractor, AV Pool Pros recommends checking the simple causes first, then arranging a professional pool inspection when the water loss exceeds reasonable evaporation or other warning signs appear.

Evaporation occurs when water changes from a liquid to a vapor and moves into the air. Several local conditions accelerate this process. High temperatures increase the water’s vapor pressure, while low desert humidity allows the air to absorb more moisture. Wind removes the layer of humid air that naturally forms above the surface, allowing additional water to evaporate. Direct UV exposure also heats the pool and surrounding surfaces.

A typical residential pool may lose approximately one-quarter to one-half inch of water per week under moderate conditions, but Palmdale’s summer weather can push evaporation higher. Large pools, elevated spas, spillovers, waterfalls, tanning ledges, and exposed water features lose even more. A pool cover can reduce evaporation substantially when it is installed correctly and used consistently.

Evaporation usually affects the entire exposed water surface evenly. The water level tends to drop more slowly during cooler, calmer weather and more quickly during hot, windy periods. If your pool loses more water after a dry, windy afternoon but stabilizes during cooler weather, evaporation may be the primary cause.

Hard water is another local concern. Palmdale and surrounding areas commonly experience mineral-heavy water, so repeated refilling can raise calcium hardness and total dissolved solids. That can contribute to scale on tile, plaster, salt cells, heaters, and waterline surfaces. Adding water may temporarily restore the level, but it does not solve the underlying reason for the loss.

Leak-related water loss is often less dependent on weather. If the pool continues dropping at a similar rate overnight, during cooler temperatures, or when the wind is calm, a leak becomes more likely. You may also notice these warning signs:

• The water level drops more than expected despite mild weather or limited pool use.
• The pool loses water faster when the pump is running or when a specific feature operates.
• Wet or unusually soft soil appears near the pool, equipment pad, skimmer, cleaner line, or plumbing runs.
• Cracks, loose fittings, deteriorated sealant, or separated tile become visible.
• The pump loses prime, air enters the system, or bubbles appear at the returns.
• The water level repeatedly settles near the same tile, return, light, skimmer, or other fitting.
• Pool chemicals become difficult to maintain because ongoing dilution changes chlorine and stabilizer levels.

Leaks can occur on the suction side of the circulation system, pressure-side return lines, drain lines, skimmers, light niches, returns, filter tanks, heaters, or the pool shell itself. High winds and sand can hide wet spots, and desert soil may absorb water quickly without leaving an obvious puddle. A leak does not always create visible damage at the surface.

A bucket test can help compare pool water loss with evaporation. Turn off the pump and water features, then fill a bucket with pool water and place it on a pool step. Keep enough of the bucket above the waterline so pool water cannot enter it. Mark the water level inside the bucket and the pool water level outside the bucket with waterproof tape or a pencil.

Leave the setup undisturbed for 24 to 48 hours. Avoid swimming, adding water, using an automatic fill system, or running waterfalls during the test. Afterward, compare the amount lost inside the bucket with the amount lost in the pool. If the pool drops noticeably more than the bucket, the difference suggests a possible leak. Repeat the test with the pump off and, if appropriate, with the pump running. A significant change between those tests can help identify whether the issue is associated with the circulation system.

This test is a useful screening tool, not a complete diagnosis. Wind can affect the pool and bucket differently, and splash-out, cleaning, swimmers, and water features can affect results. It also cannot identify the exact location of a leak.

A professional pool inspection is warranted when the bucket test shows excessive loss, the water level falls rapidly, or the loss continues regardless of weather. Inspection is also wise when you see wet soil, air in the plumbing, equipment-pad moisture, structural cracking, or unexplained chemical instability. Acting early can help prevent erosion beneath decking, damage to pool equipment, staining, costly water waste, and additional deterioration around a crack or fitting.

At AV Pool Pros, our leak detection process may include a visual inspection, pressure testing of individual plumbing lines, equipment evaluation, dye testing, and specialized listening or locating methods when needed. The right procedure depends on the pool’s construction, plumbing layout, symptoms, and whether the leak occurs with the pump on or off. We do not rely on guesswork or simply recommend adding more water.

AV Pool Pros is CSLB-licensed (#1068067) and serves homeowners throughout the Antelope Valley. If your Palmdale pool is losing water faster than expected, click Learn More to review our leak detection services and schedule an inspection. A timely diagnosis can protect your pool, your property, and your water budget.