A leak at the pool equipment pad — the puddle around your pump, filter, and heater — is usually traceable to a specific spot: a dry pump-lid o-ring, a worn pump shaft seal, a filter tank band or its o-ring, a multiport valve gasket, or a threaded union or fitting that’s worked loose. The trick is to dry everything off, run the system, and watch exactly where water reappears. Most pad leaks are simple seals and o-rings a homeowner can replace. A leak coming from the pump motor side, or one that only shows underground away from the pad, points to a shaft seal or buried plumbing that needs a pro.
What you'll need
- Paper towels or a rag (to dry everything)
- A flashlight
- Silicone o-ring lubricant
- A screwdriver and adjustable wrench
- Teflon plumber’s tape
Recommended parts & supplies
- Pump lid o-ring / gasket — the most common drip — a dry lid seal weeping water
- Pump shaft seal kit — for a leak between the pump housing and motor
- Filter tank o-ring / band gasket — seals the two halves of the filter tank
- Teflon plumber’s tape — reseals threaded fittings and drain plugs that seep
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Step by step
- 1
Dry the whole pad and pinpoint the wet spot
With the system running, wipe every surface of the pump, filter, heater, and valves completely dry with paper towels, and dry the concrete pad. Then watch for a full minute. The first place water reappears is your leak source. A puddle spreads and misleads — chasing the actual drip point to a specific fitting saves you from replacing the wrong part.
- 2
Check the pump lid and o-ring
Look at the clear pump lid first — a dry or pinched lid o-ring weeping water is the single most common pad leak. Turn the pump off, remove the lid, and inspect the o-ring for cracks or flat spots. Clean it and the groove, apply a thin film of silicone lubricant, and reseat the lid hand-tight. Replace the o-ring if it’s no longer springy.
- 3
Look where the pump meets the motor
Now check the seam between the pump’s wet housing and the motor behind it. A steady drip from that gap — the underside between the pump body and the motor — points to a failed shaft seal. Note this one but don’t force it: a shaft seal is an advanced repair that means splitting the pump, and a persistent motor-side drip flooding the motor is a reason to call a pro before the bearings and motor are ruined.
- 4
Inspect the filter tank and its o-ring
Move to the filter. Water seeping from the middle seam where the two halves of the tank meet usually means the tank band o-ring needs cleaning, lubricating, or replacing. Water at the multiport valve or at the backwash line can mean a worn spider gasket inside the valve. Check the air-relief valve and pressure gauge fittings on top too, as they commonly weep.
- 5
Tighten unions, fittings, and drain plugs
Follow the plumbing across the pad and check every threaded union (the collar fittings that connect pipe to equipment), the small pump and filter drain plugs, and the heater inlet/outlet fittings. Hand-tighten loose unions, and reseal any weeping threaded plug with a wrap of Teflon tape. Over-tightening cracks plastic fittings, so snug, not brutal.
- 6
Re-dry and confirm the fix
After tightening or replacing the culprit, dry everything again and run the system for several minutes. No new water means you found and fixed it. If a fresh puddle still forms after you’ve checked every visible seal, the leak may be underground plumbing between the pad and pool — invisible on the pad itself and a job for a pro with leak-detection gear.
When to call a pro
Call a pool pro when the leak is coming from the seam between the pump housing and the motor (a failed shaft seal that can flood and destroy the motor), when water appears underground or away from the pad rather than at a visible fitting (buried plumbing that needs pressure-testing and leak detection), or when a cracked pump or filter housing is the source rather than a replaceable o-ring. Also call for any leak on a gas heater’s internal water side or heat exchanger. And never chase a pad leak near the electrical junction, timer, or motor wiring — anything wet around 240-volt components should be powered off and left to a licensed pro.
Get a free quote from a local pro
No obligation — a licensed, insured local Houston partner will reach out. Available 24/7 for emergencies.
Find the Source of an Equipment-Pad Leak Yourself — FAQ
Why is my pool equipment pad leaking water?
How do I find where my pool is leaking?
Is a leaking pool pump seal serious?
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