Reasons Your Pool May Be Losing Water and How to Fix It

Losing water from your pool can be frustrating and costly. If you notice your pool water level dropping faster than usual, it’s a sign that something is wrong. Understanding why your pool is losing water helps you take the right steps to fix the problem and avoid wasting water or damaging your pool equipment. This guide covers common causes of water loss and practical solutions to keep your pool in great shape.

Swimming pool with low water level showing possible leak

How to Tell If Your Pool Is Losing Water

Before diving into causes, it’s important to confirm that your pool is actually losing water and not just experiencing normal evaporation. Pools naturally lose water through evaporation, especially in hot, dry, or windy conditions. To check if your pool is losing more water than it should:

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

• Wait 24 hours without using the pool or adding water.

• Measure how much the water level has dropped.

  
  

Normal evaporation usually accounts for about 1/4 to 1/2 inch of water loss per day. If your pool loses more than this, you likely have a leak or another issue.

Common Reasons for Pool Water Loss

1. Evaporation

Evaporation is the most common and natural cause of water loss. Factors that increase evaporation include:

• Hot weather

• Windy conditions

• Low humidity

• Pool surface area (larger pools lose more water)

  
  

How to reduce evaporation:

• Use a pool cover when the pool is not in use.

• Install windbreaks like fences or shrubs around the pool.

• Maintain proper water temperature to avoid excessive heating.

  
  

2. Pool Leaks

Leaks can occur in various parts of your pool system and cause significant water loss. Common leak locations include:

• Pool shell cracks or holes

• Plumbing lines and fittings

• Pool equipment like pumps, filters, and heaters

• Pool fittings such as skimmers, returns, and lights

  
  

How to detect leaks:

• Perform a bucket test to compare evaporation with water loss.

• Inspect the pool shell and surrounding areas for visible cracks or wet spots.

• Check equipment and plumbing for dripping or pooling water.

• Hire a professional leak detection service if you cannot find the leak yourself.

  
  

3. Splash Out and Backwash

Water loss can also happen from pool use:

• Splashing water out during swimming or play

• Backwashing the filter system regularly

  
  

While these losses are normal, excessive splash out or frequent backwashing can add up.

4. Faulty Pool Equipment

Equipment problems can cause leaks or water loss:

• Broken pump seals or gaskets

• Cracked filter tanks or pipes

• Malfunctioning valves that don’t close properly

  
  

Regular maintenance and inspection help catch these issues early.

5. Groundwater or Soil Issues

In rare cases, water loss may be due to soil conditions around the pool:

• Soil settling or shifting causing cracks

• High groundwater levels causing water to seep out

  
  

If you suspect this, consult a pool professional or structural engineer.

How to Fix Pool Water Loss Problems

Fixing Evaporation Loss

• Use a pool cover: Covers reduce evaporation by up to 90%. Solar covers also help retain heat.

• Add windbreaks: Plant trees or install fences to block wind.

• Lower water temperature: Use shade structures or reduce heater use.

  
  

Repairing Leaks

• Small cracks: Use pool patch kits or waterproof sealants designed for pools.

• Plumbing leaks: Tighten fittings or replace damaged pipes.

• Equipment leaks: Replace worn seals, gaskets, or cracked parts.

• Professional help: For hidden or complex leaks, hire a certified leak detection and repair service.

  
  

Managing Splash Out and Backwash

• Encourage gentle pool use to reduce splashing.

• Backwash only when necessary and follow manufacturer guidelines.

• Adjust filter settings to minimize water waste.

  
  

Maintaining Pool Equipment

• Schedule regular inspections and maintenance.

• Replace worn or damaged parts promptly.

• Keep equipment clean and free of debris.

  
  

Tips to Monitor and Prevent Water Loss

• Check water levels weekly and record changes.

• Use a pool cover consistently.

• Inspect pool equipment monthly.

• Schedule annual professional pool inspections.

• Keep pool chemistry balanced to protect pool surfaces and equipment.

  
  

Water loss can lead to higher water bills and damage to your pool structure and equipment. Catching problems early saves money and keeps your pool safe and enjoyable.