How Do I Know If My Pool Has a Leak?

The clearest homeowner check for a possible pool leak is a 24-hour bucket test. If the pool level drops more than the water inside a bucket exposed to the same conditions, the loss is probably more than evaporation. Other clues can help narrow the problem, but professional testing is often needed to locate it.

Common warning signs

Watch for an autofill that runs more than usual, unexplained water bills, damp soil, lifting or settling deck areas, water around the equipment pad, air bubbles from the returns, difficulty maintaining pump prime, or repeated chemical dilution.

A waterline that consistently falls to the same elevation can be an important clue. The leak may be near a skimmer throat, light conduit, return fitting, tile-line crack, or another penetration at that level. This is a clue, not proof.

Start with the bucket test

Disable the autofill. Put pool water in a five-gallon bucket, place it on a step with about five inches submerged, and mark the inside and outside levels. Keep swimmers out and avoid adding water. Compare after 24 hours. Restart if rain affects the test.

Check visible equipment safely

With the equipment operating normally, look for dripping unions, pump-seal leakage, filter leaks, waste-line discharge, wet valves, or heater drainage. Never open a pressurized filter or touch electrical equipment with wet hands. A suction-side air leak may pull air inward without visibly dripping water.

Homeowners sometimes compare loss with the pump on and off, but changing system conditions can create risk or confusion. If the first bucket test is positive, a professional can choose safe isolation tests.

What professional leak detection may include

The technician may use dye near suspected fittings, pressure-test plumbing lines, listen with acoustic equipment, inspect the shell and penetrations, or isolate individual systems. Dye should be used only in still water close to a suspected point; dumping dye into the pool does not locate a leak.

Fast attention matters because continued loss wastes water and chemicals and can undermine soil or decking. If your pool in Chino or the surrounding Inland Empire appears to be leaking, contact Superior Pool Pro. You can also explore weekly pool service for ongoing observation of water and equipment.

FAQ

Can a pool leak underground without a wet spot? Yes. Water can travel through soil or drainage paths without surfacing nearby.

Can I use food coloring to find a leak? Dye can help only when applied carefully in still water beside a suspected opening. It is not a whole-pool test.

Source: American Leak Detection bucket-test procedure. Updated September 9, 2026.