Why Is My Pool Losing Water? Understanding Leaks vs. Evaporation

Noticing your pool water level dropping can be stressful for any homeowner. In Southwest Florida, where pools are open all year, it’s common to lose some water naturally. But how do you know if it’s just evaporation or if your pool has a leak that needs professional attention?

Let’s break down the key differences and help you determine what’s normal and when it’s time to call in the experts. 

🌞 Evaporation: A Normal Part of Pool Ownership 

Evaporation is the most common reason for water loss in Florida pools. With high temperatures, direct sunlight, and humidity changes, pools in Florida can lose up to 1/4 inch of water per day in an unheated pool, even more during the hottest summer months. 

Factors that increase evaporation include: 

• Hot, sunny weather 
• Wind exposure 
• Lack of a pool cover 
• Heated pools 

If your pool water drops a quarter of an inch per day or less when not being heated, this is usually normal evaporation. If you lose that much during periods of rain, this indicates that you could have a leak.  

📚 Learn more about pool evaporation from our previous blog 

💧 How to Test for Evaporation vs. a Leak 

One of the easiest ways to confirm whether your water loss is from evaporation is the bucket test: 

1. Fill a bucket with pool water and place it on a pool step so the water inside the bucket matches the pool’s level. 
2. Mark both the water level inside the bucket and the pool water level outside. 
3. Wait 24 to 48 hours, making sure not to use the pool.
4. Compare the two levels. 

If the pool water outside the bucket drops significantly more than the water inside, you likely have a leak. 

✅ See a video produced by On-Time Pool Service showing how to perform a bucket test here on our YouTube channel: YouTube Bucket Test Video 

📚 Learn how to spot the difference between normal evaporation and a pool leak with insights from Latham 

 🛠️ Common Signs of a Pool Leak 

If evaporation is not the cause, you may have a leak. Signs include: 

• Rapid or uneven water loss beyond expected evaporation 
• Wet or soggy spots around the pool deck or yard 
• Air bubbles in the pump 
• Pool deck cracks or shifting soil 
• Frequent filling and increased water bills 
• Chemicals such as stabilizer and salt, which are only lost through water loss, are replenishing quickly.  

Even small leaks can cause major damage over time by eroding soil, damaging equipment, or undermining the pool structure. 

📚 Learn more about the common causes of pool leaks from Staton Pools 

 🧰 Professional Leak Detection and Repairs 

Some leaks are easy to spot, like a dripping pipe, but many are hidden underground or in your pool’s plumbing. That’s where professional leak detection comes in. Using specialized equipment, trained technicians can quickly pinpoint the problem and recommend the best repair. 

At On-Time Pool Service, we don’t just maintain water chemistry, we also diagnose equipment issues and perform expert repairs to keep your pool safe and efficient. When a leak arises, we know just the people to contact for your situation.  

✨ Conclusion: Don’t Let Water Loss Go Unchecked! 

While evaporation is perfectly normal in Southwest Florida’s heat, unexpected or rapid water loss often points to a leak that should be addressed right away. Left untreated, leaks can waste thousands of gallons of water and lead to costly damage. 

If you suspect a leak, don’t wait. On-Time Pool Service can refer you to a leak detection and repair company so you can enjoy a worry-free, crystal-clear pool year-round. 

Why Choose On-Time Pool Service? 

As a state-licensed and certified pool contractor (CPC#1459543), On-Time Pool Service offers Sarasota-area pool owners expert, transparent, and reliable care. Whether it’s regular service, diagnostics, repairs, upgrades, or renovations, we provide everything you need to enjoy your pool all year long—without the hassle. 

We specialize in: 

• Weekly pool service and cleaning: Regular maintenance to keep your pool in perfect condition. 
• Pool equipment repairs and diagnostics: Expert repairs for all your pool equipment, ensuring longevity and performance. 
• Pool automation and upgrades: Advanced automation solutions for convenient and efficient pool management. 
• Pool renovations and remodeling: Enhance the look and functionality of your pool with a new surface, tiles, coping, and even pavers.  

With On-Time Pool Service, you get trusted service backed by professional certifications, extensive experience, and a commitment to keeping your pool in top condition. 

🌐 Check out our services page on our website to explore more how we can assist or use our online instant estimate tool for a quick personalized quote based on your specific pool needs. 

Contact Us  

Ready to keep your pool in top condition? Contact On-Time Pool Service for a professional check-up on your pool! 

📞  (941) 224-0404 

📨 info@ontimepoolservice.com 

📍4047 Bee Ridge Road. Suite A, Sarasota, FL. 34233 

Let On-Time Pool Service help you enjoy a safer, healthier, and more beautiful swimming experience — all year long! 

Helpful Resources 

For more information on pool care, equipment, and maintenance, check out these independent trusted resources:  

• Independent Pool and Spa Service Association (IPSSA) 
• CDC Healthy Swimming Guidelines 
• Swim University 
• Pool & Hot Tub Alliance (PHTA) 
• Florida Department of Health 

Written by: Toni Del Rosario 

Published on September 23, 2025