If it is time to replace the machine
OXO Brew 9-Cup Coffee Maker
Solid valve and basket design, with a programmable bloom pause for cleaner extraction. Best for: a dependable everyday drip machine. Skip if you want a hands-off budget machine.
Maintenance Guides
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Coffee Maker Leaking Water? Causes & Quick Fixes
Coffee maker leaking water from the bottom, filter basket or carafe? Match the leak to its cause, fix it step by step, or know when to replace.
- By Sarah Chen
- 3 min read
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Quick answer
Coffee maker leaking water? Dry the machine, run a plain-water cycle and note where water first appears. Bottom leaks are most often scale, so unplug it and descale first. Basket overflow usually means too much coffee or blocked drain holes, and carafe leaks mean a crack or worn gasket.
Where is your coffee maker leaking water from?
Run a water-only cycle over a dry white surface, then match the spot below.
| Where it leaks | Likely cause | Jump to |
|---|---|---|
| Bottom of the machine | Scale, cracked reservoir, worn internal seal | Bottom leaks |
| Filter basket | Too much coffee, wrong filter, clogged drain holes | Basket overflow |
| Lid or carafe | Cracked carafe, worn gasket, lid not seated | Carafe and lid |
Why do coffee makers leak?
Water follows pressure and gravity to the weakest seal.
A drip machine moves water from the reservoir through a heating element into the filter basket. A leak means water is escaping at one of those points: a cracked reservoir, a worn seal or gasket, a loose hose, a clogged filter basket that overflows, or a carafe that is not seated properly.
Limescale is a common hidden cause. Mineral build-up narrows tubes and distorts seals, which raises pressure and pushes water out of weak spots. Overfilling, the wrong filter size or too-fine grounds can also make the basket overflow.
Modern fixes and current best practice
Prevent leaks rather than chase them.
Descale on a schedule suited to your water hardness, and use filtered water if your tap water is hard. Check that the filter is seated flat and the correct size, and that grind size is not too fine. Wipe seals and the carafe lid regularly, and replace gaskets if they are flattened or cracked.
Keep the machine on a level surface and never run it with a cracked carafe. Many models allow you to descale with a citric-acid or ready-made descaler, see our descaling guide. If it still leaks after a clean and a seal check, replacement is usually the sensible route.
Why is my coffee maker leaking from the bottom?
The most serious leak, since the base holds the heater and wiring. Check in this order.
1. Scale blocking the internal tubes
Sign
It used to work, brewing has slowed, and you have hard water or have not descaled in 3+ months. Deposits narrow the tubes between reservoir and heater.
Fix
- 1Unplug and let the machine cool.
- 2Descale with the method in the descaling guide, then run two plain-water cycles to rinse.
- 3Dry the base and run another water-only cycle on a dry surface.
Expect
A dry surface and a faster brew cycle.
2. Cracked reservoir
Sign
Water appears even after descaling, and a fine crack shows when you fill the reservoir at a sink under bright light. Thin plastic can crack from a knock or repeated heating.
Fix
- 1Fill the reservoir at the sink and inspect the base and seams.
- 2If you find a crack, look for a replacement reservoir on the manufacturer's site.
- 3If the part costs close to a new machine, replace the machine instead.
3. Failed internal valve or O-ring
Sign
Scale and the reservoir are ruled out. Rubber seals harden and crack after years of heat cycling, and reaching them means opening the machine. That suits only people comfortable with basic electronics, and on most home machines it signals end of life.
Why is my coffee maker overflowing at the filter basket?
Coffee spilling over onto the warming plate is almost always a user-correctable problem.
1. Too much coffee or too fine a grind
Sign
The basket is full of slow-draining slurry. Stay within the dose in your manual, and go a little coarser, because a very fine grind packs the bed. The grind size chart shows the right range for drip.
2. Wrong filter or poor placement
Sign
Grounds or water slip past the filter edge. Basket and cone filters are not interchangeable, and one that is slightly small leaves gaps at the walls.
Fix
- 1Use the filter type and size in your manual.
- 2Pre-fold the seams.
- 3Press the filter flat against the basket walls before adding coffee.
3. Clogged drain holes
Sign
A normal dose still overflows. Fines and dried oils block the small holes, so coffee cannot exit fast enough.
Fix
- 1Remove the basket and hold it under hot running water.
- 2Clear each hole with a stiff brush or toothpick.
- 3Reinstall and run a water-only cycle.
Expect
Water drains steadily with no pooling above the filter.
Why is my carafe or lid leaking?
The easiest leaks to diagnose, since you can see where the coffee escapes.
1. Cracked glass carafe
Sign
Hold the carafe up to window light and look along the body and base seam for a hairline crack. Glass cracks from thermal shock (a cold carafe on a hot plate, or cold water poured into a hot one), knocks or age. Replace it rather than repair it. Carafes for most major brands come from the manufacturer or third parties, typically $20-$50.
2. Worn lid gasket
Sign
Thermal carafes seal with a rubber or silicone gasket that wears with dishwasher cycles and coffee oils.
Fix
- 1Remove the lid and lift out the gasket.
- 2Check that it is pliable and seated evenly, with no cracks, tears or flat spots.
- 3Replace it if damaged; gaskets are inexpensive for most carafes.
3. Lid not seated
Sign
It leaks only after cleaning. Partial engagement on push-button or twist-lock lids leaves a gap, so refit the lid until it clicks or locks fully.
When should you replace a leaking coffee maker?
A repair stops making sense in these four cases.
- Internal tube, pump or valve failure: descaling did not help and there is no reservoir crack. Repair needs disassembly and specialist parts.
- Recurring leaks on a machine over five years old: seals and O-rings are at end of life.
- Cracked reservoir moulded into the body: it cannot practically be repaired.
- Water has reached the electrical components: internal corrosion may already have occurred, so continued use risks an electrical fault.
If you are replacing, look for quality seals, a well-designed basket and a stainless or heavy-duty carafe. The Fellow Aiden and Breville Grind Control reviews cover precision builds, or compare the best drip coffee makers, the best programmable coffee makers if you want a timer, or the best coffee makers under $500.
A longer-term replacement
Technivorm Moccamaster KBGV Select
Handmade in the Netherlands, with a copper boiler and all-metal build. Best for: buyers who want a machine to last 10+ years. Skip if you want a budget pick.
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Still leaking?
Pick the line that matches your situation.
Quick decision guide
It leaks from the bottom and you have not descaled lately
Work through the descaling guide, or try cleaning tablets for routine upkeep.
Your espresso machine, not a drip maker, is leaking
See the espresso machine maintenance guide for gaskets and seals.
Descaling and seal checks changed nothing
Replace the machine, starting with the best drip coffee makers.
Frequently Asked Questions
Quick answers before you buy.
Not if water reaches the base, cord or heating element: unplug it and stop using it until the cause is fixed.
A basket overflow or carafe drip is a lower risk but still worth fixing.
Common causes are a reservoir that is not fully seated, a clogged needle or built-up scale.
Reseat the reservoir, rinse the pod area and descale the machine.
Yes.
Scale can narrow internal tubes and wear seals, pushing water out through the wrong path.
Regular descaling and cleaning tablets reduce the risk.
No.
Sealants are a poor, unsafe fix on hot parts that touch drinking water.
Replace the gasket or reservoir with a manufacturer part, or replace the machine.
It usually means a seal or crack opens under heat and pressure, or the basket overflows.
Run a water-only cycle over a dry white surface to see where the water first appears.
It can be.
Water near the base and electrics risks a short circuit, so unplug it immediately and let it dry fully.
If water reached the power cord or base electronics, or you see damage, stop using it and replace it rather than repair it.
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