Updated at: 30-05-2022 - By: Helen Skeates

In order to remove mold from a Keurig water reservoir, there are a number of methods available. If you don’t have any of those on hand, try vinegar or baking soda. In this article, we’ll go over some non-commercial ways to get rid of mold.

Mold On Keurig Water Reservoir

Because of the quantity of moisture they retain, drink dispensing equipment is prone to mold growth. This, of course, involves your beloved Keurig.

How To Clean Mold From Keurig Water Reservoir: 4 Easy Steps - Krostrade

What Is Keurig?

Coffee makers made by Keurig are well-known and may be found in nearly every home. If you take good care of your Keurig, it can last up to seven years on average.

Contact your coffee maker’s manufacturer if you’re having issues with it. You may be able to take advantage of the one-year warranty offered by Keurig’s manufacturer.

How does mold grow in a Keurig water reservoir?

Due to the water remaining in the reservoir for a lengthy amount of time, mold forms. The reservoir’s material makes it an ideal target for mold.

Mold can grow in filthy cups if they are used frequently. It could potentially lead to health issues, so be careful.

Standing water in the tray can also lead to mold growth. Leaving the tray unattended is a surefire way to encourage the growth of mold.

What are the tell-tale signs of mold growth in a Keurig water reservoir?

You can detect whether your Keurig has mold by looking for these symptoms:

sneezing and headaches could be caused by mold in your coffee maker, if you’re allergic to mold. Your Keurig might become a breeding ground for mold spores after it has been infested by it. For information on how to get rid of mold spores in the air, check out this page.

An even more noticeable indicator of mold infestation is growth on the water reservoir or placement tray of your Keurig coffee maker. You may also notice a bad smell coming from your machine, which is an indication of mold.

Cleaning Mold From Keurig Water Reservoir

Step #1. Check if it is dishwasher-safe

Make sure your water reservoir is dishwasher safe by inspecting the embossing. If this is the case, simply put it in the dishwasher. Dishwasher portions can be washed while other parts are cleaned manually.

Step #1.2 Not dishwasher-safe

Use diluted vinegar as an alternative if your water reservoir is not dishwasher safe. First, mix equal parts of water and vinegar in the container. Then, let the diluted solution sit for a few minutes.

Step #2. Scrub

Use diluted vinegar as an alternative if your water reservoir is not dishwasher safe. First, mix equal parts of water and vinegar in the container. Then, let the diluted solution sit for a few minutes.

Use diluted vinegar as an alternative if your water reservoir is not dishwasher safe. To begin, fill the container halfway with water and the other half with vinegar. Then, let the diluted solution sit for a few minutes.

Step #3. Run through the machine

Alternatively, if your reservoir is not dishwasher-safe, you can use diluted vinegar instead. First, fill the container halfway with water and the rest with vinegar. After that, let the diluted solution sit for a few minutes.

Make a few additional passes through this process if you are cleaning your Keurig for the first time. Start and stop your Keurig multiple times with clean water if you’ve got a lot of it in your reservoir.

Step #4. Rinse

Rinse the reservoir several times to remove the vinegar from the container for good measure. You won’t need to rinse the baking soda paste as often because it’s so easy to remove.

Coffee descaler products can be used as an alternative to vinegar and baking soda. Use the product’s directions to your fullest extent.

Ways to take care of Keurig water reservoir

There is a risk of mold growth in any type of beverage distribution equipment. The most important reason for this is that it could lead you to consume moldy coffee.

An article on what happens after drinking mold may help you if you suspect you’ve ingested mold. You’ll also learn about the warning signals of mold in your beverage from the article on mold.

As a general rule, if you want to keep mold from growing on your Keurig, you need to be careful when using it. Your coffee machine may be cared for with these tips.

Leave the lid open

To prevent the growth of mold, you must ensure that your machine is well ventilated. The lid can be left open when you aren’t using it.

Clean the platform tray

The platform tray is another source of extra moisture because of the water and coffee it collects. After a while, the water and coffee combine to form a sludge, which can then grow mold. Dish soap and a moist cloth are all you need to disinfect the platform.

How To Clean Your Keurig To Avoid Mold And Bacteria

Wipe down

After each usage, give the coffee machine an interior clean. Dry it with a paper towel to avoid mold formation.

Clean cups

Do not use a dirty cup if you’re too lazy to change yours. Using soiled cups could allow mold to grow in your beverage, which could have negative effects on your health.

How Long Can You Leave Water In Your Keurig?

For the most part, if you only leave water in your reservoir overnight, you should be good. To remove any early impurities that may have emerged while you slept, the water tank will heat up and purify itself before you prepare your morning coffee.

Keurig water should not be left in the machine more than two days.

Regardless of whether you use a Keurig or not, if you leave water sitting about for a long period of time, it can provide a breeding ground for a variety of other organisms. We’ll discuss these Floating Objects in further detail later.

A 40- to 80-ounce water tank is standard on most Keurigs. If you prefer to brew five to 10 cups of coffee at a time, you’ll have enough here.

The Keurig 60-second-or-less coffee philosophy would be compromised if the reservoir had to be dumped and fresh water used each time.

Every time you refill your water reservoir, it makes sense to top it off so you don’t have to do any more effort for yourself. If you consume two or three cups of coffee a day, a full reservoir should last you at least a few days without re-pouring and reheating.

Should You Leave Water In Your Keurig?

Leaving a cup of water in your Keurig for a short length of time can save you both time and money. With a pre-filled reservoir, you won’t have to worry about running out of pre-coffee energy.

The internal water tank of many Keurig machines is difficult to drain. You can save yourself a lot of effort by leaving the beverage in your cup until you’re ready to use it again.

Take your Keurig apart, wait for it to drip, and then put it back together again to drain the tank. Even if it takes a few of days, you can avoid this by utilizing all of the tank’s water to brew coffee.

Don’t worry, your Keurig was built to handle this kind of consistent use. The foregoing advantages and none of the disadvantages are yours if you finish and refill the reservoir on a regular basis.

Limescale Build-up

Limescale can form in your Keurig if your usual coffee schedule is disrupted and water is left in the machine for an extended period of time. Limescale, often known as calcium carbonate, is a white, crusty buildup that forms around the waterline of plumbing systems.

Raw water evaporates and leaves behind limescale. Your water’s mineral content can change the color of your water from a light tan to a darker brown or even crimson hue.

You shouldn’t be afraid of it because it isn’t toxic and is normally present in little levels in coffee machines. In addition, long-term use of coffee can lead to kidney stones, and long-term buildup on a coffee maker can cause the unit to break down.

The flavor of your coffee may be slightly tainted by limescale buildup. Coffee connoisseurs can truly strain their gears by not being able to detect this subtlety.

Keurig Machine Bacteria Breeding Grounds?

Bacteria and mold love the moist, dark interior of your coffee maker. Your coffee grounds can become breeding grounds if you leave water in them for too long.

Bacterial contamination in coffee machines was investigated by researchers at the University of Valencia, who discovered 30 to 70 distinct types of bacterial colonies. For example, there was Staphylococcus and E. coli in there, as well as E. coli.

Study by the Armstrong Forensic Laboratory in Texas found that single-serving machines have around twice as many bacteria and mold as machines that create a full pot of coffee.

Rather than being caused by the water or coffee itself, this study discovered that the majority of these colonies form as a result of cross-contamination. Putting milk in a Keurig is another solid reason not to do so.

In other words, cleaning your hands before using your Keurig may help to minimize cross-contamination.

What To Do If Water Is Left Too Long

If the water in your Keurig has only been sitting for a few days, it is generally safe.

If you want to be extra cautious, run a few brew cycles without coffee to kill any creepy crawlies that may have emerged. By doing so, you’ll bring the water to a boil and ensure that everything dangerous is rendered inert.

After two days of sitting, we recommend draining the water. Before re-filling the reservoir, you should thoroughly clean it.

We recommend descaling your machine if you notice any limescale residue near the waterline. Your Keurig’s reservoir can be descaled manually if it doesn’t include an auto-descaling feature.


How long can you leave water in Keurig reservoir?

In general, water in the Keurig reservoir can be left for two to three days. However, it is recommended that you reheat the water prior to use. Over time, bacteria can grow and limescale can build up in the reservoir of your Keurig. Consuming significant amounts of both might have a negative effect on your health.

How do you clean mold out of a Keurig reservoir?

Pour distilled white vinegar into the reservoir half-way, then add hot water. Let the mixture settle for 30 minutes before using it (this cleans the reservoir itself). When all of the solution has been brewed, use the Keurig’s brew function to remove the remaining solution.

Do Keurigs get mold inside?

Even while Keurig coffee makers can develop mold, this is not a problem exclusive to Keurigs. Mold can grow on any type of product if it isn’t cleaned and cared for correctly. White vinegar is the best solution to use to clean the resevoir of a Keurig coffee machine.

How often should you clean Keurig water reservoir?

When: Every three to six months, or when daily brewing slows down. Follow the manufacturer’s directions for your specific model. Mineral build-up and scaling can have a negative impact on the performance of the brewer and, consequently, the taste of your beer.

Does water stay inside a Keurig?

The K-Slim coffee maker differs from other Keurig® models in that it does not include an internal water tank. In order to store water, just the exterior Water Reservoir needs to be emptied.

Kick Your Keurig Out Of Your Kitchen IMMEDIATELY

Can you leave water in your Keurig overnight?

Bacteria, mold, and algae will attack any appliance exposed to warm, moist environments, therefore cleaning is a must on a regular basis. If you’re going to drink the coffee in less than 12 hours, you can probably leave the water in your Keurig overnight.

Why does my Keurig get moldy?

Cleaning a coffee maker properly is just as important as cleaning the rest of your kitchen appliances. Germs can build up to the point where you become ill since the hot water isn’t strong enough to clean the machine.

Why are Keurigs bad?

Studies reveal that even “safe” plastic like that used in K-Cups, which have been proven to be BPA-free, can have hazardous consequences when heated. The compounds in these plastics can function like estrogen in your body, causing imbalances in your hormones.

How do I keep algae out of my Keurig?

Your Keurig’s water reservoir should be empty. If your reservoir has a filter or filter unit, remove it. Clean water, in the same large coffee cup you’d use to make coffee, should be added to the pot. For non-pour-in reservoir units, repeat the procedure a second time.

What are the symptoms of mold exposure?

Mold can cause a variety of health issues, including:

  • A runny or clogged nose.
  • Eyes that are red and wet.
  • Coughing sound.
  • rashes on the skin.
  • sore throat
  • sinusitis.
  • wheezing.

How do I clean my Keurig water reservoir?

After that, wet the cloth. And make sure the area is free of any debris. When you get to step three, turn the brewer on. you’ll be able to

Can I run bleach water through my Keurig?

Definitely! The brewing mechanism of a coffeemaker should never be cleaned with bleach because it can damage the appliance. White household vinegar can be used in the brew cycle to remove hard-water buildup, though. The outside of a coffeemaker or filter can be cleaned with a moderate bleach and water solution.

Are Keurig water reservoir dishwasher safe?

Towel Time

It is possible to wash the reservoir, drip tray, and its cover in a dishwasher. However, the reservoir lid should not be washed in a dishwasher. Put them in a sink full of hot water and 1 teaspoon dish liquid as an alternative. After 15 minutes of soaking, thoroughly rinse and towel-dry them.

Can you put coffee in the water reservoir?

Re-brewing should, in theory, increase the caffeine concentration of coffee, therefore the quick answer is yes. My reasoning for coming to this conclusion is as follows: At room temperature, the solubility of caffeine in water is approximately 16mg/mL or 4000 mg/cup, whichever is lower (250 mL).

How do I prevent mold in my coffee maker?

Vinegar can be used to de-calcify your dishwasher once a month.

This is Forte’s secret weapon: good ol’ white vinegar. Using a paper filter, fill the machine’s reservoir with equal parts vinegar and water. Place the pot where you want it and let the solution “brew” for a half-hour. Allow the machine to rest for 30 minutes after turning it off.


Keeping your Keurig’s water reservoir clean is a surefire method to extend its lifespan. Keeping mold at bay is also an option, which we’ve covered in this article