How to Clean Keurig Water Reservoir

Why the Keurig Water Reservoir Needs Regular Cleaning

The water reservoir is the part of your Keurig that holds the water used for every brew. Over time, mineral deposits from hard water build up on the interior walls, creating a cloudy film or white scale. Mold and bacteria can also grow in the reservoir if it's left with standing water for extended periods. A dirty reservoir affects the taste of your coffee and can clog the machine's internal components. Cleaning it monthly keeps your coffee tasting fresh and your machine running smoothly.

What You'll Need

• Dish soap and warm water
• White vinegar or citric acid
• Soft bottle brush
• Microfiber cloth
• Keurig descaling solution (for full descale)

A long-handle bottle brush is essential for scrubbing the interior of the reservoir — it reaches the bottom and sides that a cloth or sponge can't access. For mineral deposit removal, citric acid powder dissolved in water is the most effective descaling solution. The Keurig Compatible Descaling Solution kit includes both descaler and cleaning pods for a complete maintenance cycle.

Step-by-Step: How to Clean a Keurig Water Reservoir

Step 1: Power Off and Remove the Reservoir

Turn off the Keurig and unplug it. Lift the water reservoir straight up and off the machine. Most Keurig reservoirs detach easily by lifting — no tools required.

Step 2: Remove the Filter (If Applicable)

Many Keurig reservoirs have a water filter cartridge inside. Remove it before cleaning and set it aside. If the filter is more than 2 months old or has been used for 60 tank refills, replace it rather than reinstalling the old one.

Step 3: Empty and Rinse

Pour out any remaining water. Rinse the reservoir with warm water, swirling to dislodge any loose debris or sediment.

Step 4: Wash with Dish Soap

Add a few drops of dish soap and warm water to the reservoir. Use a soft bottle brush to scrub the interior walls, bottom, and the lid. Pay attention to the corners and the area around the water outlet at the bottom. Rinse thoroughly — any soap residue will affect coffee flavor.

Step 5: Remove Mineral Deposits with Citric Acid

If you see white scale or cloudy film on the interior walls, fill the reservoir with a solution of 1 tablespoon of citric acid powder dissolved in a full reservoir of water. Let it soak for 20–30 minutes. The citric acid dissolves calcium and magnesium deposits effectively. Scrub with the bottle brush, then rinse thoroughly 2–3 times with fresh water.

Step 6: Clean the Reservoir Lid

Wash the lid separately in warm soapy water. Use a small gap cleaning brush to reach into the lid's hinge and seal areas where mold can grow. Rinse and dry.

Step 7: Dry Completely

Dry the reservoir interior with a clean microfiber cloth as much as possible, then allow to air dry completely before reinstalling. Never reinstall a wet reservoir if the machine will sit unused — standing water promotes mold growth.

Step 8: Reinstall and Run a Rinse Cycle

Reinstall the water filter (new or existing) and snap the reservoir back onto the machine. Fill with fresh water and run 1–2 brew cycles with water only (no K-Cup) to flush the system before brewing coffee.

How to Prevent Mold in the Keurig Reservoir

• Never leave standing water in the reservoir for more than 1–2 days.
• Empty and rinse the reservoir if you won't be using the machine for several days.
• Leave the reservoir lid open when not in use to allow air circulation and prevent moisture buildup.
• Replace the water filter every 2 months or 60 tank refills.

How Often Should You Clean the Reservoir?

• Rinse: Every time you refill it.
• Wash with soap: Weekly for daily users.
• Descale with citric acid: Monthly, or whenever you see mineral deposits.
• Full machine descale: Every 3–6 months using the Keurig descaling solution.

Final Thoughts

The water reservoir is the foundation of every cup your Keurig makes — keeping it clean directly affects coffee quality. A weekly soap wash and monthly citric acid descale takes less than 15 minutes and ensures your machine stays hygienic and your coffee tastes its best.