Port St. Lucie Leak Detection Wet spot in the yard or sinking pavers: reading an underground leak
A persistently soggy patch of grass, a soft area of deck, or pavers that have started to sink near the pool is one of the more actionable symptoms in leak work, because it points at a specific part of the system: an underground line.
Read the clues before you call
Where is it, relative to the pool and the equipment pad? Pool plumbing runs between the two. A wet area on that line is a strong pointer. A wet area on the far side of the house is probably not the pool.
Does it change with the pump? Worse when the pump runs points at the pressure side, the return lines. Present regardless points at the suction side or a static leak. That distinction is worth more than any other observation and the pump test page explains how to run it properly.
Is it wet, or is it just low? A depression that holds water after rain is a grading problem. A patch that stays damp through a dry week is a leak.
Has anything moved? Sinking pavers, a deck section that has dropped or lifted, or a crack in the deck coping. Water washing out sand under a deck does that, and on Treasure Coast soils it moves quickly.
Rule out irrigation. Shut the system off for a few days and see whether the area dries. A stuck valve or a broken lateral produces exactly this symptom and costs a fraction to fix. Worth ruling out before booking anything.
What it usually is
| What you see | Likely cause | Path |
|---|---|---|
| Wet patch between pool and pad, worse with the pump on | Return line break | Plumbing repair $500–$1,500+ |
| Wet patch, unchanged by the pump | Suction line or a static leak elsewhere | Pressure test to confirm |
| Pavers sinking near the pool | Sand base washing out beneath | Find the line first, then relay |
| Soft or hollow-sounding deck section | Void under the deck from washout | Investigate before it collapses |
| Damp only after rain | Grading, not a leak | Nothing to fix here |
| Dries when irrigation is off | Irrigation | Irrigation contractor |
| Wet at the equipment pad itself | Pad fittings, valves, or the filter | Usually visible and cheaper |
The pricing page publishes every range.
Why the wet spot is not always above the break
On sandy soil, water leaving a broken line takes the easiest path, which is often sideways along the pipe trench or along a deck base rather than straight up. By the time it surfaces it can be several feet from the break.
That is exactly why the repair starts with pressure testing each line individually, not with digging where the grass is wet. Isolate the line, pressurise it, and watch whether it holds. The line that fails is the line to chase, and electronic location then narrows it to a point.
The difference matters financially: pinpointing means cutting one small section of deck rather than trenching along a guess.
Why sinking pavers deserve attention
Beyond the leak, a void under a deck is a structural problem in its own right. It gets bigger, the surface above it eventually fails, and on a pool deck that is somewhere people walk barefoot.
It is also frequently the earliest sign of an underground leak, appearing before the water loss is obvious enough to notice. If your pavers have started to move and you have not thought about a leak, it is worth twenty minutes of testing.
What the repair costs, and what drives it
$500–$1,500 and up. The pipe costs very little. The number is driven by what sits on top:
| Over the line | Impact |
|---|---|
| Open ground or planting bed | Cheapest case |
| Pavers | Lift, repair, relay. Usually straightforward |
| Poured concrete deck | Cut, repair, patch. Patching never matches perfectly; expect to be told up front |
| Under a screen enclosure footing | Access work before any plumbing |
Ask about rerouting. Where a line can be abandoned and run on a different path, the deck can stay intact. It is not always possible and not always cheaper, but it belongs on the table before anyone cuts concrete.
Start with detection
The flat detection fee is $250–$400 for a standard residential pool, $350–$500 with a spa, $400–$550 with spa and features. It buys pressure testing on every line, dye testing on the shell and fittings, electronic location, a written report, and a separate repair quote you can take anywhere.
For an underground leak specifically, that pinpointing is most of the value: it is the difference between one small cut and a trench. The cost calculator prices detection plus the repair range for your situation.
What to expect on the call
Where the wet area is relative to the pool and the pad, whether it changes with the pump, whether it dries when irrigation is off, whether anything has sunk or moved, and what is over the plumbing run. We cover Port St. Lucie, Fort Pierce, Jensen Beach, Stuart, Palm City, Port Salerno, and St. Lucie West.
Frequently Asked Questions
Does a wet spot in the yard mean a pool plumbing leak?
It is one of the stronger signs, particularly if it is between the pool and the equipment pad and if it is worse when the pump runs. On sandy Treasure Coast soil the water often travels before it surfaces, so the wet spot is not always directly above the break, but it does tell you which line to test first.
Why are my pavers sinking near the pool?
Water washing out the sand base underneath them. On the sandy soils here that happens faster than most people expect, and a leaking underground line is the most common cause when the sinking is near the pool or along the equipment run. It is also a good early warning, because it often appears before the water loss is obvious.
What does it cost to fix?
$500–$1,500 and up. The pipe is inexpensive; the cost is what is over it. Open ground or planting bed is the cheap case, pavers lift and relay, poured concrete has to be cut and patched, and a break under a screen enclosure footing is the expensive one.
Could it be irrigation instead?
Easily, and it is worth ruling out first because the fix is far cheaper. Shut the irrigation off for a few days and see whether the wet area dries. If it does, you have an irrigation problem rather than a pool problem.