Why is my pool losing 1 2 inch of water a day?

Is Your Pool Losing Too Much Water? Here’s What to Know

It's normal for your pool to lose a little water each day—mostly due to evaporation. On average, you can expect about 1/4 inch of water loss per day from evaporation alone. But if you're noticing drops closer to 1 or even 2 inches daily, something more than just evaporation could be at play.

Several factors increase evaporation: hot temperatures, dry air, wind exposure, and whether the pool is used frequently. Running a pool heater or leaving it uncovered can also speed things up. In especially arid or windy climates, losing up to 1/2 inch per day might still be within a reasonable range—but exceeding that is a red flag.

Losing 1 to 2 inches of water every 24 hours usually points to a leak somewhere in the system. The culprit could be a crack in the liner, a faulty seal around the pump or filter, or even a problem in the underground plumbing. Over time, these leaks can lead to structural damage, higher water bills, and unbalanced chemistry.

Before calling a technician, you can do a simple bucket test: Fill a bucket with water, mark the water level inside and out, and leave it in the pool for 24–48 hours without running the system. If the pool water drops significantly more than the bucket’s water, you likely have a leak.

Don’t ignore persistent water loss. What starts as a minor drip can become a costly repair. Catching it early not only saves water but protects your pool’s integrity. When in doubt, consult a licensed pool professional to pinpoint and fix the issue—before it gets worse.