The math and the damage both argue for fixing it. A leaking pool costs more every month it runs, and underground leaks actively erode the soil and deck above them while you wait.
It feels simple in the moment: the pool is losing water, adding water is cheap, and finding and fixing the leak costs money. But this calculation ignores two things that make it the wrong call over any significant period of time.
A residential pool losing half an inch per day above normal evaporation loses approximately 125 to 250 gallons per day depending on pool size. At South Florida municipal water rates, that adds up to a real recurring monthly cost. Use the free Evaporation Calculator from Leak Business Academy to see what your specific pool surface area is losing in gallons and dollars before deciding whether "just adding water" is actually cheap.
If the leak is in an underground plumbing line -- a broken return, suction line, or main drain pipe -- the water escaping from that pressurized pipe is not going nowhere. It is saturating the surrounding soil and washing fine particles away from beneath the pool deck. Every day the leak runs, more soil is displaced. Eventually the concrete above the eroded area has no support and begins to crack, settle, and fail.
The longer an underground leak runs, the more soil is compromised and the more restoration work is needed after the pipe is repaired. Fixing the pipe plus filling the void is more expensive than fixing the pipe alone. Waiting makes the total bill larger, not smaller.
Every time water is added to make up for loss, fresh water dilutes the pool's chemistry -- reducing sanitizer levels, altering pH, and requiring chemical correction. A leaking pool costs more to keep chemically balanced than a tight pool. This ongoing chemical cost is invisible in the monthly budget but real.
Detection cost plus repair cost is almost always less than the cumulative water cost, chemical cost, and eventual structural damage cost of waiting. The longer the wait, the worse the ratio gets. The right time to fix a pool leak is when it is found.
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For a very minor structural leak at a fitting that is losing only a fraction of an inch per day, short-term monitoring while scheduling may be reasonable. For any confirmed underground pipe break, delay is not recommended -- the soil erosion and void formation begin immediately and worsen with every day the leak runs.
Get the leak detection done first so you know exactly what is broken and where. Sometimes what appears to be a large repair job is actually a small targeted fix once the exact break location is known. Full line replacement is sometimes the recommended option but is not always necessary. Knowing the specific finding before getting repair quotes produces better quote accuracy.
Underground pipe breaks often do -- ground movement, root growth, and the erosion caused by the escaping water itself can all expand a small crack into a larger break over time. Structural leaks at fittings can also worsen as the surrounding bond deteriorates. Neither type typically stays exactly the same indefinitely.