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Espresso Machine Leaking Water: Causes and Fixes

Updated August 3, 2026 · Home and commercial machines

Before treating a leak as a fault, work out whether the water is coming from somewhere it should. Machines with a 3-way solenoid valve dump the puck's remaining pressure into the drip tray after every shot, so a wet tray is normal and a full tray will overflow onto the counter and look like a leak. Empty the tray, dry the counter, then run one shot and see exactly where water appears. If it comes from the rim of the portafilter during the shot, the group gasket or a dirty basket rim is the cause. If it appears under the machine only while brewing, look at the tank seal and its connections. Water pooling under a machine that is merely switched on and idle, or any leak accompanied by steam inside the chassis, is different: that is an internal fault, and it is a technician's job because the leak sits next to mains wiring and a hot boiler.

Causes, most likely first

Work down the list. Each cause has a check you can perform before you change anything, so you are diagnosing rather than swapping parts.

  1. 1. The drip tray is full or has been reseated incorrectly

    You can fix this

    How to confirm it: Pull the tray out. If the float is up or the tray is at the brim, the overflow you are seeing is simply expelled water with nowhere to go. Check also that the tray is pushed fully home and that the grate sits flat.

    What to do: Empty and rinse the tray, dry the recess, and refit it squarely. On machines with a 3-way valve expect a few millilitres in the tray after every shot; that discharge is the valve releasing puck pressure and it is normal.

  2. 2. The group gasket is worn or the basket rim is dirty, so the portafilter no longer seals

    Routine maintenance

    How to confirm it: Pull a shot and watch the join between the portafilter and the group. Water weeping or squirting from the rim while pressure builds is a seal failure. Check whether the handle now locks much further round than it used to.

    What to do: Wipe the basket rim and the group seat clean before every shot. If the gasket is hard, cracked, or the handle position has drifted a long way, fit a new gasket of the correct thickness for your model.

  3. 3. The portafilter is not locked in far enough, or the basket is overfilled

    You can fix this

    How to confirm it: Note where the handle sits at lock-up against the machine's marked position, and check whether coffee grounds are sitting on the basket rim. An overfilled basket that touches the shower screen also breaks the seal.

    What to do: Reduce the dose so the tamped bed clears the screen, brush the rim clean, and turn the handle to its marked lock position with steady pressure. Never force a handle that will not turn: something is in the way.

  4. 4. The water tank seal, outlet valve, or its connection is leaking

    You can fix this

    How to confirm it: Fill the tank, dry the surrounding area with paper towel, and leave the machine off for 20 minutes. Fresh water appearing beneath the tank position with the machine cold and idle isolates the leak to the tank side.

    What to do: Remove the tank, check the outlet grommet for splits or grit, clean the seat and refit. Replace the tank or its seal if the plastic is cracked. A hairline crack in a tank often only weeps when the tank is full.

  5. 5. A scaled or worn one-way valve is letting water back down into the tray

    Routine maintenance

    How to confirm it: Look for a slow but continuous drip from the group between shots, long after the normal post-shot discharge has finished, on a machine that is otherwise brewing correctly.

    What to do: Run a full descale cycle first, as deposits holding a valve seat open are a common cause. If the drip continues after descaling and rinsing, book a technician rather than dismantling the group.

  6. 6. An internal hose, boiler fitting, or seal inside the chassis has failed

    Call a technician

    How to confirm it: Water pools under the machine while it is heating or idle rather than during brewing, or you see steam escaping from the case, or the leak returns immediately after every dry-out. Any of these means water is loose inside the housing.

    What to do: Stop and call a technician. Unplug the machine at the wall and stop using it: water inside the chassis sits alongside mains wiring and a hot pressurised boiler. Do not open the case to look.

When to stop and call a technician

This fault is on the technician side of that line. Do the user-serviceable checks above and no more.

Never bypass, disable or remove a safety device — a thermal fuse, pressure relief valve or lid interlock is the part standing between a fault and a fire. Do not open a pressurised boiler or work on mains wiring.

What the fix needs

As an Amazon Associate we earn from qualifying purchases. These are category searches, not product endorsements — always use the consumable your machine's own manual specifies.

If your machine shows a code

A code on the display narrows this down considerably, because the machine is telling you what it thinks is wrong. Look it up by brand →

Other faults

Frequently asked

Is water in the drip tray after a shot normal?
On any machine with a 3-way solenoid valve, yes. The valve vents the pressure trapped in the puck so the portafilter releases cleanly, and that water goes to the tray. On machines without that valve, a wet tray after every shot is worth investigating.
Why does water leak only when I brew?
Because the leak point is only pressurised during the shot. That pattern points at the portafilter seal, the group, or a joint downstream of the pump, rather than at the tank.
Can I keep using a leaking machine?
Only if you have confirmed the water is coming from the tray or the portafilter rim. If the leak is inside the chassis, unplug it and stop using it until a technician has looked, because water and mains wiring in the same space is a shock and fire risk.
How often should the group gasket be replaced?
Home machines typically need one every one to two years, busier machines more often. Rising handle position and weeping at the rim are the practical signals, not the calendar.