A swimming pool is a great way to relax and enjoy the summer, but it can quickly become a source of frustration if it starts losing water unexpectedly. Pool leaks are more common than many homeowners realize, and if left unchecked, they can lead to costly repairs and wasted water. Knowing the warning signs of a pool leak can help you catch the problem early and save time and money.

This post will guide you through 10 clear signs that your pool might have a leak, what to look for, and practical steps you can take to confirm and address the issue.

1. Unexplained Drop in Water Level

One of the most obvious signs of a leak is a consistent drop in your pool’s water level. Pools naturally lose some water due to evaporation, but if you notice the water level dropping more than about an inch per day, it could indicate a leak.

How to check:

• Mark the water level with a piece of tape or a marker on the pool wall.

• Check the level after 24 hours without using the pool or adding water.

• If the water level drops significantly more than expected evaporation, a leak is likely.

  
  

2. Pool Water Loss Despite No Usage

If your pool loses water even when it hasn’t been used for days, this is a strong warning sign. Evaporation rates depend on weather conditions, so if the water loss seems excessive during cool or humid days, a leak might be the cause.

3. Wet Spots or Puddles Around the Pool

Look around the pool deck and surrounding areas for unusually wet spots or puddles. These can indicate water escaping from the pool structure or plumbing underground.

Tip:

• Check these spots after the pool pump has been off for several hours.

• Persistent dampness or soggy soil near the pool equipment or walls is suspicious.

  
  

4. Algae Growth or Cloudy Water

Leaks can cause chemical imbalances in your pool water. If you notice algae growth or cloudy water despite regular cleaning and chemical treatment, water loss might be affecting the pool’s chemistry.

5. Cracks or Damage in Pool Structure

Inspect the pool shell, tiles, and surrounding concrete for cracks or visible damage. Even small cracks can allow water to escape slowly, leading to leaks.

Example:

• Hairline cracks in plaster or tile grout can be a source of leaks.

• Pool walls bowing outward or shifting may indicate structural issues causing leaks.

  
  

6. Increased Water Bills

A sudden spike in your water bill without increased household usage can be a clue. Pools require a lot of water to fill, so a leak can cause a significant increase in water consumption.

7. Pool Pump Running Longer Than Usual

If your pool pump runs longer or more frequently to maintain water circulation, it might be compensating for water loss. Leaks can cause the pump to work harder to keep the pool clean and balanced.

8. Low Water Pressure in Pool Equipment

Leaks in the plumbing lines can cause a drop in water pressure. If you notice your pool’s filtration system or heater is not working efficiently or the pressure gauge reads lower than normal, check for leaks in pipes or fittings.

9. Air Bubbles in Pool Return Jets

Air bubbles coming from the return jets can indicate a leak in the suction side of the pool plumbing. This happens when air is sucked into the system through cracks or loose fittings.

10. Visible Water Seeping from Pool Equipment or Surroundings

Check your pool pump, filter, heater, and valves for any visible water leaks. Water pooling around equipment or dripping from pipes is a clear sign of a leak that needs immediate attention.

What to Do If You Suspect a Leak

If you notice one or more of these signs, it’s important to act quickly:

• Perform a bucket test to confirm water loss is due to a leak and not evaporation. Fill a bucket with pool water, place it on a step in the pool, and mark the water level inside and outside the bucket. After 24 hours, compare the levels. If the pool water level drops more than the bucket water, you likely have a leak.

  
  

• Inspect pool equipment and plumbing for visible signs of damage or moisture.

  
  

• Call a professional pool leak detection service if you cannot locate the leak yourself. They use specialized tools like pressure testing and electronic leak detectors to find hidden leaks.