How to Tell If Your Pool Is Leaking

Evaporation vs. a Real Leak

Every pool loses water. In the Tampa Bay area, summer heat and humidity pull one quarter to one half inch of water off the surface every day. That adds up to roughly two inches per week during peak summer months, which can look alarming.

A real leak consistently drops the water level faster than evaporation explains. Watch for these warning signs:

• Water loss greater than two inches per week with no heavy splash-out
• Wet or soggy soil around the pool equipment pad
• Cracks in the shell, decking, or coping
• Rising water bills without a clear reason
• Auto-fill valve running almost constantly
• Algae blooms that return quickly after treatment (diluted chemicals)

If you spot two or more of these signs together, run the tests below before calling a leak detection company.

The Bucket Test: Your First Step

This is the most reliable do-it-yourself method for confirming a pool leak. It isolates natural evaporation so you can compare it to actual pool water loss.

1. Fill a five-gallon bucket with pool water to about one inch from the top.
2. Set the bucket on the first or second pool step so it sits in the water and stays at the same temperature as the pool.
3. Mark the water level inside the bucket with a piece of tape or a marker.
4. Mark the pool water level on the wall or skimmer.
5. Turn off the auto-fill valve if you have one.
6. Wait exactly 24 hours. Do not run the pool during rain.
7. Check both levels. The bucket shows evaporation. The pool shows evaporation plus any leak.

If the pool dropped more than the bucket, you likely have a leak. A difference of one quarter inch or more over 24 hours is worth investigating further.

The Pump Test: Finding Where the Leak Originates

Once you confirm the pool is losing water beyond evaporation, the pump test helps narrow down whether the leak is in the structure or the plumbing.

1. Run the bucket test again for 24 hours with the pump running normally.
2. Record the pool water loss.
3. Run the bucket test a second time for 24 hours with the pump turned completely off and the system plugged.
4. Record the pool water loss again.

Compare the two results:

This information is valuable when you call a leak detection company or pool contractor. It cuts diagnostic time and cost.

Common Leak Locations in Tampa Bay Pools

Florida’s sandy soil, tree roots, and freeze-thaw cycles in other states rarely apply here, but Tampa Bay pools face their own pressures. High water tables, shifting soil after heavy rain, and aging surfaces all contribute to leaks.

• Skimmer throat: The joint between the plastic skimmer and the concrete shell cracks over time. This is one of the most common leak spots.
• Return fittings and jets: The gaskets and fittings that connect return lines to the shell degrade after years of chemical exposure.
• Light niches: The conduit and seal around underwater lights are frequent leak points.
• Shell cracks: Settling soil causes hairline cracks that grow. Surface cracks sometimes penetrate all the way through older plaster or marcite finishes. See our pool resurfacing page for repair and refinishing options.
• Underground plumbing: PVC lines under the deck can crack at joints. This type of leak often requires pressure testing by a professional.
• Pool decks and coping: Water can travel under a cracked deck and erode the soil beneath the shell. Learn more on our pool decks and pavers page.

If your pool has been leaking for months without repairs, the surrounding soil may already be compromised. In that case, a full inspection is smarter than a patch-only approach.

What Repairs Cost and When to Resurface Instead

Small fixes like re-sealing a skimmer throat or replacing a return fitting typically run a few hundred dollars. Underground plumbing repairs cost more, often ranging from $500 to $2,000 depending on how many lines are affected and how deep they run.

If your pool surface is old, stained, or showing multiple cracks, a targeted repair may not be the best value. Resurfacing addresses the whole shell at once and restores a watertight surface. Current Tampa Bay pricing:

If your equipment is also aging, this is a good time to look at upgrades. Our pool equipment and automation page covers variable-speed pumps, salt systems, and smart controls that save money long term.

For pools with structural damage, cracked bond beams, or outdated layouts, a full remodel may cost $25,000 to $55,000 but delivers a completely rebuilt pool. See our pool remodeling page for what that scope of work includes.

If your pool is beyond repair, a new pool runs $65,000 to $150,000 in the Tampa Bay market. Visit our new pool construction page for details on what drives those costs.