If you have a pool pipe leak under concrete, you need to locate the breach and choose between trenchless pipe repair or concrete cutting. This guide explains how to fix pool pipe leak under concrete using proven methods, from electronic leak detection to epoxy lining. Below, we break down every step, equipment needed, and when to call a pro.
Step 1: Confirm the Leak Location
Before any repair, pinpoint where the water is escaping. Common signs include a wet spot on the deck, a drop in pool water level, or a running fill valve. Leak detection specialists use pressure testing and acoustic sensors. The International Association of Plumbing and Mechanical Officials (IAPMO) provides standards for underground piping that guide these tests.
Using a Pressure Test
Shut off the pump and plug the pipe ends. Attach a pressure gauge and apply air (40–60 PSI). If the pressure drops quickly, the pipe is leaking. Mark the suspected area on the concrete.
Step 2: Decide Between Trenchless vs. Jackhammer Methods
There are two primary ways to fix a pool pipe leak under concrete. Each has pros and cons:
- Trenchless (Epoxy Pipe Lining): A resin-impregnated liner is pulled through the pipe and inflated. Cured with hot water or steam, it creates a new pipe inside the old one. No concrete removal needed. Cost typically ranges from $80–$150 per linear foot in the US.
- Concrete Cutting (Excavation): A jackhammer cuts a section of the slab to expose the broken pipe. The damaged piece is replaced and the concrete is patched. Cost: $500–$2,000 per repair, depending on slab thickness and rebar.
Step 3: Trenchless Repair – Step by Step
What You’ll Need
- Pipe inspection camera
- Cured-in-place liner kit (available from pool supply stores)
- Hot water source or steam generator
- Bladder plugs to isolate the section
Procedure
- Clean the pipe: Run a drain snake with a brush attachment to remove debris.
- Measure and cut liner: The liner should be 10% longer than the repair section.
- Insert liner: Use a pull cord or inversion bladder. Inflate the bladder so the liner presses against the pipe wall.
- Cure: Circulate hot water (180°F) for 1–2 hours. Allow to cool and deflate the bladder.
- Inspect: Run the camera to confirm a smooth, leak-free seal.
- Mark and cut: Use a concrete saw to outline a 12x12-inch square around the leak mark.
- Jackhammer: Break the concrete and remove pieces. Dig out soil to access the pipe.
- Cut and replace pipe: Saw out the damaged section. Install a PVC coupling and solvent-weld a new piece.
- Backfill and patch: Tamp soil, pour a concrete patch, and smooth it. Allow 24 hours to cure before filling the pool.
This method is endorsed by the EPA WaterSense program as a water-saving technique because it stops losses without major excavation.
Step 4: Concrete Cutting Repair – Step by Step
Safety First
Contact your local utility marking service (dial 811 in the US) before cutting. Wear hearing protection and steel-toe boots.
Steps
Cost Comparison Table
| Repair Method | Typical Cost (US) | Concrete Damage | Lifespan |
|---|---|---|---|
| Trenchless (Epoxy Liner) | $80 – $150 per linear foot | None | 20–50 years |
| Concrete Cutting (Excavation) | $500 – $2,000 per repair | Patch required | 25–40 years |
Prices vary by region and accessibility. Always obtain 2–3 quotes from licensed plumbers.
When to Call a Professional
If the pipe is under a pool deck that’s part of a structural slab, or if you can’t locate the leak with a pressure test, hire a pro. Pipe repair specialists have sonic equipment and commercial lining machines. Attempting jackhammer work near plumbing lines can cause sewer line damage if not careful.
Preventing Future Leaks
Keep pool water chemistry balanced to avoid pipe corrosion. Install a water softener if your supply has high mineral content. Schedule annual pressure tests. The CDC’s Healthy Water site recommends routine inspections for all in-ground plumbing.
Frequently Asked Questions
Can I fix a pool pipe leak under concrete without breaking the slab?
Yes – trenchless epoxy lining is the most common no-dig method. It works for straight runs and gentle curves. Your plumber will inspect the pipe with a camera first.
How do I know if the leak is in the pipe or the pool shell?
Perform a bucket test: fill a bucket with pool water and mark the water level. Place it on the pool step. After 24 hours, compare the pool level drop to the bucket drop. If the pool loses more water, it’s likely a pipe leak.
Is epoxy pipe lining safe for pool pipes?
Yes – NSF/ANSI 61 certified epoxy is safe for potable water and pool circulation. It does not leach chemicals once cured.
How long does a trenchless repair last?
High-quality epoxy liners can last 20 to 50 years, depending on water temperature and chemical exposure.
Will my homeowner’s insurance cover the repair?
Most policies cover sudden damage (e.g., a pipe burst) but not gradual leaks. Check your deductible; many plans cover the repair minus the deductible.
Can I use a pipe patch kit from a hardware store?
Rescue tape or rubber patches only work as a temporary fix for accessible pipes. For leaks under concrete, they fail quickly. Professional lining or replacement is the only permanent solution.
Get Professional Help Today
At MyTownPlumber, we specialize in drain cleaning, water heater repair, and underground leak solutions. If you need to fix a pool pipe leak under concrete, schedule an on-site inspection. Contact us now for a free estimate and get your pool back in shape.
By MyTownPlumber Editorial Team