Replace your Keurig water filter in under five minutes

The water filter in a Keurig sits inside the reservoir and catches sediment, chlorine, and other particles before they reach your coffee. Over time it clogs and stops working, which means your coffee tastes worse and your machine has to work harder. Replacing it takes about three minutes and costs between $8 and $15 per filter.

Most Keurig models use the same filter cartridge — the Keurig Charcoal Water Filter — though a few older machines use a different design. You can buy replacements at any grocery store, Target, Walmart, or online. The filter screws into a plastic holder that stays in your reservoir, so you only replace the cartridge itself, not the whole assembly.

Key Takeaways

  • Keurig water filters should be replaced every two months or after brewing 60 tanks of water, whichever comes first.
  • The filter cartridge costs $8 to $15 and screws into a holder that remains permanently in your reservoir.
  • You must soak a new filter in water for 15 minutes before installing it, or it will restrict water flow.
  • If your machine brews slowly or tastes off after replacement, the filter may not be seated correctly or you may have skipped the soaking step.

When to replace your Keurig water filter

Keurig recommends replacing the filter every two months. If you brew fewer than two cups a day, you may stretch it to three months. If you brew more than four cups daily, replace it every six weeks.

A clogged filter shows up as slower brewing — water takes longer to heat and dispense — or a change in taste. If your coffee suddenly tastes flat or bitter, the filter is usually the culprit. Hard water areas (where you see white mineral buildup on faucets) need filter changes more often because the filter clogs faster.

What you need before you start

Gather a new Keurig Charcoal Water Filter cartridge, a cup or bowl of water, and your Keurig machine. Check that your machine is unplugged and has cooled for at least 10 minutes if you have just brewed coffee. The reservoir will be warm, but you do not need to wait for it to be completely cold.

If you do not know which filter your Keurig uses, check the manual or look at the bottom of your current filter cartridge — the model number is printed there. Most machines made after 2010 use the standard charcoal filter. Older K-Cup brewers and some commercial models use a different cartridge, so verify before you buy.

Step-by-step filter replacement

Step 1: Remove the reservoir. Lift the water reservoir straight up and away from the machine. Empty any remaining water into a sink. You do not need to drain it completely, but having less water makes the next steps easier.

Step 2: Locate the filter holder. Look at the bottom of the reservoir — you will see a plastic cylindrical holder with a threaded opening. The old filter cartridge screws into this holder. If this is your first filter replacement, the holder may have a blank cap instead of a cartridge.

Step 3: Remove the old filter. Grip the filter cartridge and turn it counterclockwise (left) until it unscrews. It will come out easily — do not force it. Discard the old cartridge.

Step 4: Soak the new filter. This step is critical. Place the new cartridge in a cup of water for 15 minutes. This saturates the charcoal and removes air pockets that would otherwise slow water flow through your machine. If you skip this step, your Keurig will brew very slowly or not at all.

Step 5: Install the new filter. After soaking, screw the cartridge into the holder by turning it clockwise (right). Tighten it by hand until it is snug — you should not need a tool. Do not overtighten, as this can crack the plastic.

Step 6: Refill and run a test brew. Fill the reservoir with fresh water and reinstall it on the machine. Plug in the Keurig and run one full brew cycle without a K-Cup to flush the system. This clears any loose charcoal particles from the new filter. Discard this water.

Troubleshooting slow brewing after filter replacement

If your machine brews slowly after you install a new filter, the most common cause is skipping the 15-minute soak. The charcoal needs to absorb water before it can let water pass through. If you forgot to soak, remove the filter, soak it for 15 minutes, and reinstall it.

The second most common cause is an air pocket trapped in the filter. Remove the reservoir, unscrew the filter, and make sure the cartridge is fully submerged in water for the full 15 minutes. Tap the cartridge gently on the bottom of the cup to release bubbles. Then reinstall and test again.

If the filter is installed correctly and soaked properly but the machine still brews slowly, the filter holder itself may be clogged with mineral buildup. Unscrew the filter, fill the holder opening with white vinegar, and let it sit for 30 minutes. Rinse thoroughly with water, then install a freshly soaked filter.

How long a Keurig water filter lasts

A Keurig charcoal filter lasts about two months under normal use. The exact lifespan depends on your water quality and how much you brew. Hard water clogs filters faster because minerals accumulate on the charcoal. If you have a water softener or drink filtered tap water already, your Keurig filter may last closer to three months.

Some machines have a filter indicator light that reminds you when replacement is due. If yours does not, write the installation date on the filter cartridge with a permanent marker so you remember when to replace it. Replacing on schedule keeps your coffee tasting fresh and prevents the machine from working too hard.

Where to buy replacement filters

Keurig Charcoal Water Filters are sold at grocery stores in the coffee aisle, at Target and Walmart in the kitchen appliance section, and online through Amazon, Keurig's official website, and most major retailers. A single cartridge costs $8 to $15 depending on the retailer. Buying a pack of four or six filters usually costs less per cartridge than buying them one at a time.

Check the packaging to confirm it says "Keurig Charcoal Water Filter" and lists your machine model. Third-party filters exist but often fit poorly or restrict water flow more than the original. Sticking with the genuine Keurig filter ensures proper fit and performance.

Frequently Asked Questions

Can I use my Keurig without a water filter?

Yes, but you should not. Without a filter, sediment and chlorine go directly into your coffee, making it taste worse. The machine also has to work harder to push water through mineral buildup, which shortens its lifespan. If you are out of filters, order one online and use bottled water in the meantime.

What happens if I do not soak the new filter before installing it?

The machine will brew very slowly or not at all because air pockets in the dry charcoal block water flow. If this happens, remove the filter, soak it for 15 minutes, and reinstall it. One forgotten soak will not damage the machine.

Do I need to replace the filter holder too?

No. The plastic holder screws into the bottom of the reservoir and stays there permanently. You only replace the cartridge that screws into the holder. The holder lasts the life of the machine.

Can I clean and reuse an old Keurig water filter?

No. Once the charcoal is saturated with sediment and chlorine, rinsing does not restore it. The filter must be replaced. Reusing a clogged filter will not improve your coffee and defeats the purpose of filtering.

How do I know if my Keurig uses the standard charcoal filter?

Check your machine manual or look at the bottom of your current filter cartridge for the model number. Most Keurigs made after 2010 use the standard Keurig Charcoal Water Filter. If you are unsure, take a photo of the old filter and show it to a store associate before you buy a replacement.