Why Is My Hot Tub Leaking? How to Find and Repair

Why Is My Hot Tub Leaking? How to Find and Repair

There's nothing quite as disheartening to a hot tub owner than discovering a leak in their prized spa. It can be a true mood-killer; perhaps even worse, these leaks can be notoriously challenging to locate. You could lose an afternoon playing detective, and the frustration can quickly escalate. However, understanding the primary causes of these leaks and how to avoid them can save you considerable time and energy. 

It's worth noting before we delve in: always familiarize yourself with your warranty options when buying a hot tub. Make sure it's covered in case of leaks or other unexpected issues. 

Detecting a Hot Tub Leak 

Detecting where your hot tub leak originates can be as simple as adding food coloring or dye to the water. Dark water appearing first can indicate the location of the leak.  

Alternatively, let the water level drop naturally (with the spa not running) and carefully note where the water stabilizes. This method can help you determine the level at which the leak is occurring. 

However, these strategies are most effective for major leaks. A more in-depth investigation might be necessary to pinpoint the location and cause of less noticeable leaks. 

Fixing a Hot Tub Leak 

There's a range of typical reasons and locations for hot tub leaks. If the issue remains unresolved, it lies in one of the common problem areas outlined below. 

The Pump 

The circulation pump is a frequent leak source. Before examining it, always remember to switch off the power, then check beneath the pump for leaking water. 

Three main reasons a pump might leak are a failing shaft seal, union fittings, or the volute. 

  • Seal Shaft: If the seal has failed, you can usually replace just the seal, not the whole pump 
  • Union Fitting: These three-part connectors at the pump's entrance and exit might need to be tightened, have the o-ring adjusted, or entirely replaced 
  • Volute: If the leak is coming from the volute, the impeller's housing, you will likely need to replace it 

In some cases, the whole pump might require replacement. 

The Heater 

If the pump isn't the culprit, the heater could be. The heater, the pressure switch, and other components within the assembly could cause a leak. While individual parts might be replaceable, you might need to replace the entire heater or arrange for repairs. 


Hot tubs have various valve styles, each with unique repair methods. Check all valves on your hot tub and replace them as necessary. 


Inspect all pipes, jets, and other connections. While some might need a simple tightening or sealing, others could require total replacement. If you have a failing gasket, ensure you order the correct parts, as different spas use different gaskets. A PVC pipe crack can be sealed with products like Plast-Aid, which hardens stronger than the PVC. 

Spa Shell 

While spa shells are often made of robust fiberglass, leaks can still occur, often from a jet or other component attached to the shell rather than the shell itself. Plast-Aid can seal these holes or cracks if a leak happens here. 


A leaky hot tub can be a significant headache, but understanding the common causes and solutions can simplify the process. Regular maintenance and inspection can help you catch potential issues early and prevent major leaks. Remember to keep your warranty details handy and consult with professionals when needed. Happy soaking!