How Long Can You Leave Water in a Coffee Maker

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Written By Elizabeth Anderson

Passionate and experienced foodie, traveler, and lover of all things home-related. Currently writing for a variety of blogs on recipes, cooking hacks, food politics and more!

You can leave water in a coffee maker for up to two weeks. After that, the water will start to stale and develop an off-flavor.

How Long Does Brewed Coffee Last?

If you’re like most people, you probably start your day with a cup of coffee. But how long can you leave water in a coffee maker before it needs to be replaced? The answer is: it depends.

If you have a standard drip coffee maker, the water should be replaced every two weeks. If you have a Keurig or other type of single-serve coffee maker, the water should be replaced every month. Of course, these are just guidelines.

If you live in an area with hard water, you may need to replace the water more frequently. And if you don’t use your coffee maker very often, you can get away with replacing the water less often. At the end of the day, it’s important to use fresh water in your coffee maker to get the best tasting cup of coffee possible.

So make sure to empty and refill the reservoir as needed!

Leaving Water in Coffee Maker Overnight

Leaving water in your coffee maker overnight is not recommended. This is because the water can start to grow bacteria, which can then contaminate your coffee. The water can also start to develop a stale taste, which will ruin your morning cup of coffee.

If you must leave water in your coffee maker overnight, be sure to clean it out thoroughly before using it again.

How Long Can You Leave Water in a Coffee Maker


How Long Should Water Sit in a Coffee Maker?

It is recommended that you allow water to sit in a coffee maker for at least 30 seconds before brewing. This allows the water to reach the ideal temperature for brewing coffee, which is between 195 and 205 degrees Fahrenheit. If the water is not allowed to sit long enough, it will not be hot enough to extract all of the flavor from the coffee beans.

If the water sits for too long, it will begin to lose heat and will not be as effective at extracting flavor.

Can Bacteria Grow in Coffee Maker?

Yes, bacteria can grow in coffee makers. In fact, coffee makers are often a breeding ground for bacteria because they are warm and moist, two conditions that bacteria need to thrive. The most common type of bacteria found in coffee makers is Pseudomonas aeruginosa, which can cause infections in people with weakened immune systems.

To prevent bacterial growth in your coffee maker, be sure to clean it regularly with soap and water. You should also descale it every few months to remove any build-up of minerals that could provide a food source for bacteria.

Can You Put Refrigerated Water in Coffee Maker?

If you’ve ever had a long night and needed a quick pick-me-up in the morning, you may have been tempted to put refrigerated water in your coffee maker. However, you may be wondering if this is actually safe to do. The answer is yes, it is perfectly safe to put refrigerated water in your coffee maker.

In fact, many people believe that using cold water actually results in a better cup of coffee. The reason for this is that hot water can sometimes cause the coffee grounds to become over-extracted, resulting in a bitter taste. Cold water, on the other hand, extracts the flavor from the grounds more slowly, resulting in a more balanced cup of coffee.

Of course, if you’re short on time, you can always just use room temperature water instead of waiting for your tap water to cool down. However, if you want the best possible cup of coffee, using cold water is definitely the way to go.

How Long Can Water Sit in a Bunn Coffee Maker?

Assuming you are referring to how long water can sit in the reservoir without being used: The answer is it depends. If you have hard water, it is recommended that you empty the reservoir and clean it out every few weeks.

If you have soft water, you can probably get away with leaving the water in the reservoir for a month or two. Either way, it’s important to descale your coffee maker every few months to prevent mineral buildup and keep your coffee tasting its best.

How Often Should I Change the Water in My Keurig?

Assuming you are referring to the water reservoir and not the drip tray: It is recommended that you change the water in your Keurig every 3-6 months, or more often if you notice a decrease in performance or taste. Over time, minerals can build up in the water tank and affect the quality of your coffee.


It is generally recommended that you clean your coffee maker every 40 brews, or about once a month. However, if you leave water in your coffee maker for too long, it can become a breeding ground for bacteria. Thus, it is important to clean your coffee maker regularly and to always remove any water that is left in the machine after brewing.

If you do not plan on using your coffee maker for an extended period of time, it is best to empty the water reservoir and clean the machine completely before storing it.

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