Why Is My Pool Losing Water? Common Causes and What to Do
The Hidden Causes of Pool Water Loss
Owning a swimming pool is one of life’s great luxuries—until you notice the water level is mysteriously dropping. While some water loss is expected through natural processes, significant or sudden decreases in your pool’s water level can signal a more serious issue that needs prompt attention. At The Pool Chemist, we’ve helped homeowners throughout the Hudson Valley pinpoint and resolve pool water loss for decades. Here’s a guide to help you understand the common causes and what you can do about them.
Normal vs. Abnormal Water Loss
It’s completely normal for pools to lose a small amount of water each day. On average, due to evaporation, a pool can lose anywhere from 1/4 to 1/2 inch of water per day—more during hot, dry, or windy weather. However, if you’re adding more than two inches of water per week, it’s time to investigate further.
Common Causes of Pool Water Loss
1. Evaporation
Environmental conditions like high temperatures, wind, low humidity, and direct sun exposure can all accelerate water evaporation. If your pool is uncovered during sunny days, this is often the most benign reason for water loss.
What to do: Use a pool cover to reduce evaporation, especially overnight. The Pool Chemist offers energy-saving pool cover solutions that also help reduce heat loss and chemical use.
2. Splash-Out and Backwashing
Splashing during play and backwashing your filter system can account for noticeable water loss, especially if your pool gets heavy use or you’re backwashing more frequently than needed.
What to do: Minimize excessive splashing and only backwash when pressure levels indicate it’s necessary.
3. Leaks in the Plumbing System
Leaks in underground plumbing or return lines can be difficult to detect but can cause significant water loss. Symptoms include soggy ground near the pool, air in the pump, or reduced water pressure.
What to do: Contact The Pool Chemist for a professional inspection. Our team can locate and repair underground plumbing issues without unnecessary digging or damage.
4. Liner Damage or Cracks in Pool Surfaces
Vinyl liner pools can develop small tears over time, and gunite or concrete pools may develop cracks due to age, freeze-thaw cycles, or settling.
What to do: Visually inspect the pool liner or surface for damage. If unsure, call us for a thorough inspection and timely repair or resurfacing. We specialize in vinyl liner replacement and gunite pool restoration.
5. Faulty Equipment
Old or damaged equipment like pumps, filters, or heaters can leak. Even small drips can add up to measurable water loss over time.
What to do: Regularly inspect your pool equipment and schedule routine maintenance. If you suspect a leak, our team can help identify the source and provide fast, effective solutions.
6. Skimmer or Return Leaks
Sometimes, leaks occur at the skimmer or where return jets are installed—especially if these areas weren’t sealed properly or have shifted over time.
What to do: Check for visible gaps or cracks. Temporary sealants are available, but a professional repair is often the safest long-term fix.
The Bucket Test: A Simple Way to Check for a Leak
If you’re unsure whether water loss is due to evaporation or a leak, try the bucket test:
- Fill a bucket with pool water and place it on a pool step (weigh it down if needed).
- Mark the water level inside the bucket and the pool water level outside the bucket.
- After 24 hours, compare the two levels.
If the pool water level drops more than the water in the bucket, you may have a leak.
When to Call The Pool Chemist
Detecting the cause of water loss isn’t always straightforward. With over 40 years of experience serving the Hudson Valley, The Pool Chemist provides comprehensive leak detection, pool restoration, equipment repair, and professional maintenance services. Whether you’re in Kingston, New Paltz, Woodstock, or beyond, we’ll help ensure your pool stays full, safe, and ready for use.
Worried about your pool losing water? Contact The Pool Chemist today for a professional diagnosis and repair. Let us keep your backyard oasis in peak condition all season long.
