Pool leaks are a fact of life in Central Florida, but most of them come from the same handful of causes. Knowing what those causes are — and the early signs of each one — is the fastest way to catch a small problem before it turns into a major repair.

Here are the five most common reasons swimming pools develop leaks in our area.

1. Underground plumbing leaks

The plumbing that runs under your deck and through the soil around your pool is under constant pressure and constant stress. Over time, the pipes can crack, separate at the joints, or rub against a rock and develop a pinhole.

Common signs:

  • Pool losing more than ¼ inch of water per day
  • Air in the pump strainer basket
  • Wet or soggy spots in the yard, even when it hasn’t rained
  • The auto-fill running constantly

A pressure test on the suction and return lines pinpoints which side of the plumbing has the leak. Most underground plumbing leaks are fixable in a single visit without breaking more than a square of deck.

2. Shell cracks and structural movement

Central Florida’s soil shifts with moisture and temperature, and that movement is felt most at the pool shell. Hairline cracks in plaster, gunite, or fiberglass are extremely common, especially in pools that are 10+ years old or have been through a few hard freezes.

Common signs:

  • Visible cracks at the tile line, around the skimmer, or in the floor
  • Calcium deposits along a crack (a sign the crack has been leaking for a while)
  • Water loss that comes and goes with the weather

Small shell cracks are usually sealed with an epoxy or injection resin in a single visit. Larger structural cracks may need resurfacing, which is a bigger project but stops the leak permanently.

3. Skimmer and return-fitting leaks

The skimmer is the most common leak source on most Central Florida pools. The seam between the plastic skimmer body and the concrete (or gunite) shell eventually separates — sometimes by a hair, sometimes by a quarter inch — and water finds its way out every time the pump runs.

Common signs:

  • Water loss only when the pump is running (suggests suction-side leak)
  • Air bubbles in the pump
  • A crack or gap visible at the skimmer-throat seam

Skimmer repairs are typically quick: clean the seam, apply a two-part epoxy or polyurethane, and re-test. Return fittings (the jets in the pool wall) have the same issue and the same fix.

4. Equipment pad leaks

The pump, filter, heater, and salt cell all live on the equipment pad, and any one of them can develop a leak at a fitting, a union, or a seal. These are usually easy to spot because they leave water on the pad, but they can also drip into the soil silently if the pad slopes toward the yard.

Common signs:

  • Visible water on the equipment pad
  • A pump that loses prime overnight
  • The filter air bleed running more often than it should

Equipment leaks are usually a quick fix — a new o-ring, a re-seated union, or a small replacement part. If the equipment itself is old (10+ years), it may be worth replacing rather than repairing.

5. Cracks in the deck and around the coping

The deck around the pool moves independently of the pool shell. When the deck settles, shifts, or pulls away from the coping, it can open a path for water to escape — especially if the pool water level sits above the deck seam.

Common signs:

  • A visible gap between the deck and the pool coping
  • Cracks in the deck that reach all the way to the pool
  • A pool that loses water mostly during or after heavy rain (the water finds the crack path)

Deck and coping repairs usually involve sealing the seam and, in some cases, re-tiling the affected area. If the deck has settled significantly, mudjacking or a deck replacement may be the right long-term fix.

What to do if you see any of these signs

The fastest way to confirm a leak is the bucket test — it takes 24 hours and tells you whether the water loss is real or just evaporation. Once you know you have a leak, a professional pool leak detection service will find the exact source and recommend the smallest repair that fixes it.

Catching the cause early almost always means a smaller repair bill. The same leak ignored for a season can go from a $200 epoxy fix to a $5,000+ deck and shell restoration.