You know there's a leak — the water bill is climbing, you hear water running, or there's a damp spot that won't dry. But where is it? STL Plumbing Pros uses electronic acoustic detection, thermal imaging, and pressure isolation testing to locate hidden leaks in walls, under slabs, and in underground lines — without unnecessary demolition. Once found, we provide pipe leak repair on the spot.
Signs of a Hidden Leak
Unexplained water bill increase — even $20–$30 more per month can indicate a leak.
Water meter moves when all fixtures are off — the definitive test for a supply-side leak.
Damp spots on walls, floors, or ceilings with no obvious source.
Mold or mildew in unexpected places — closets, behind furniture, under cabinets.
Sound of running water when nothing is on — especially noticeable at night.
Our Detection Process
Isolate & Pressure Test
We isolate sections of your plumbing system to determine which line is leaking — hot, cold, or drain. Pressure testing confirms the leak and narrows the search area.
Pinpoint with Technology
Electronic acoustic sensors listen for the sound of escaping water. Thermal imaging reveals moisture patterns behind walls. We mark the exact leak location.
Recommend & Repair
With the leak located precisely, we recommend the most cost-effective repair. Detection fees are typically credited toward the repair cost if we do both.
Pricing
| Service | Price | Details |
|---|---|---|
| Electronic leak detection | $150–$350 | Non-invasive acoustic and electronic detection. |
| Thermal imaging inspection | $200–$400 | Infrared camera to identify moisture behind walls. |
| Slab leak detection | $250–$500 | Specialized equipment for under-slab pipe location. |
| Leak detection + repair | Detection fee applied to repair | Detection cost credited toward repair if we do both. |
What Our Customers Say
"Water bill kept going up. They found a slab leak with acoustic detection — no unnecessary digging. Saved us thousands in potential damage."
"Heard water running at night. They used thermal imaging and found a leak behind the bathroom wall. Minimal drywall removal to fix."
"Bought an older home and wanted a plumbing inspection. They found two slow leaks we never would have caught. Money well spent."