Every summer, Las Vegas pool owners watch their water level drop and wonder the same thing: Is this just the desert, or do I have a leak? It’s a fair question. In our climate, pool water evaporation is normal — but there’s a line between normal evaporation and a real problem, and knowing where that line sits can save you hundreds of dollars in wasted water and repairs.
How Much Pool Water Evaporation Is Normal in Las Vegas?
In most parts of the country, a pool loses about a quarter-inch of water per day to evaporation. In the Las Vegas summer, that number climbs. Between triple-digit heat, single-digit humidity, and constant wind, it’s common to lose a quarter-inch to a half-inch per day — and on the hottest, windiest days, even more.
Over a week, that adds up fast. Losing 2 to 3 inches across a week in July is completely normal here and does not mean anything is wrong. Several factors push your pool water evaporation rate higher:
- Heat and low humidity — the two biggest drivers, and both extreme in our summers.
- Wind — moving air pulls moisture off the surface much faster.
- Water features — fountains, waterfalls, and spillovers dramatically increase surface area and loss.
- No cover — an uncovered pool evaporates far more than a covered one.
The Bucket Test: Evaporation or Leak?
Here’s a simple test any homeowner can do to separate normal evaporation from a leak.
- Fill a bucket with pool water and set it on the second step of your pool so it’s partly submerged.
- Mark the water level inside the bucket and the pool level outside it.
- Leave the pump running normally for 24 to 48 hours.
- Compare the two drops.
Because the bucket water and pool water sit in the same conditions, they should evaporate at the same rate. If the pool level dropped noticeably more than the bucket, water is escaping somewhere other than evaporation — you likely have a leak. If both dropped about the same, you’re just watching the desert do its thing.
Signs It’s Actually a Leak
Beyond the bucket test, watch for these red flags:
- You’re losing more than about a half-inch per day consistently, even in mild weather.
- The area around the pool, equipment pad, or decking stays wet or soggy for no clear reason.
- You see cracks in the plaster or gaps around tile and fittings.
- Your water bill jumps without a change in usage.
- The autofill runs constantly to keep up.
A water level that keeps dropping in spring or fall, when pool water evaporation should be low, is a strong leak signal that you may have a leak.
What to Do Next
If the bucket test points to evaporation, the fix is simple: top off as needed, and consider a pool cover or reducing water-feature runtime to slow the loss. Balancing your chemistry after big refills matters too, since our hard water concentrates minerals every time you add more.
If the test points to a leak, don’t wait. Leaks waste water at Las Vegas rates and can undermine your pool structure and decking if they reach the surrounding soil. Professional leak detection pinpoints the source without tearing your pool apart.
Not sure which one you’re dealing with? PoolServ offers leak detection and residential and commercial pool repair across the Las Vegas valley. Reach out and we’ll help you find out whether it’s normal pool water evaporation of the desert or a problem with your pool that is definitely worth fixing.
