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Hydro Flasks are some of the most popular water bottles nowadays and are great for keeping cold drinks cold and warm drinks warm.

But how often do they need to be washed to remain sanitary? Especially if you are just using your hydro flask for water, does it really need to be washed? Or can you just keep refilling it?

For a quick answer, if you are filling your hydro flask with a drink which is not water, you should wash it after every use. If you are using it for water, you should wash it weekly just to make sure that nothing is becoming unhygienic.

With that out of the way, we are going to go over some key information and hydro flasks and how and when to wash them. So if you have a hydro flask, and you want to know how to properly look after it, make sure to read this guide closely!

What Is A Hydro Flask?


Hydro flasks are some of the most popular bottles on the market at the moment. However, if you do not own one (or even if you do) you might not know what is so special about them and why they are so popular.

The main selling point of hydro flasks is that they are vacuum insulated which means that they are very good at insulating the contents of your bottle.

This means that if you put a cold liquid in there and seal it, it will stay cold for a longer time than it would in a standard bottle, and the same will work for a warm liquid as well.

On top of this, hydro flasks have great built quality meaning they are designed to last longer than a standard plastic water bottle. Because of the material they will not retain flavor like a plastic water bottle does.

Hydro flasks also have plenty of designs available meaning the aesthetic of owning them has become popular, this is why you hear so much about them.

They are not the only bottles to do what they do, but they are definitely the most popular. And because of all their features, they can be more expensive than a normal water bottle, so that is why knowing how to look after them is so important.

How Often Should You Wash A Hydro Flask Used For Water?

One of the most common ways people use their hydro flasks is just for water. This is to avoid any flavors getting stuck in there, and this is what they are best at carrying.

Luckily if you only use your hydro flask for water, you will not need to wash it as often, and you can get away with just washing it weekly.

A great way to stop there from being any chance of bacteria forming in your bottle is to give it a daily rinse of hot water to kill off any potential bacteria.

Even though you only have to wash it weekly, giving it a daily rinse will be a good way of getting any old water out.

If you have not washed your hydro flask recently, do not worry about having to throw it away. Just give it a more intense wash than you usually would.

How Often Should You Wash A Hydro Flask Not Used For Water?

While hydro flasks are most commonly used for water, because of the ability to insulate so well, they are used for all sorts of drinks hot and cold like tea and coffee or juice and soda.

If this is what you are using your hydro flask for, you will want to make sure that you are properly rinsing it after every wash and giving it a proper wash, if you do not do so, eventual build up of mold is inevitable. You will also start noticing stains on the inside of your cup, and as well as this the flavor from the previous drink will carry over to the next one.

As well as the potentially harmful bacteria, your water bottle will start to smell pretty bad. Because of this you should properly wash your hydro flask between each drink which is not water.

How To Wash Your Hydro Flask?

How To Wash Your Hydro Flask
One thing which is quite frustrating about owning a hydro flask is that there is not too much information which is made obvious by the company on how to clean these water bottles.

Something you should definitely do when you are cleaning your hydro flash is to make sure to clean out the rubber gasket as this is where the most mold will start to build up and particles from drinks will collect there. When you are scrubbing you want to make sure to put some focus on this area.

To wash the bottle use hot soapy water and use a brush to scrub the inside to make sure that it is properly clean.

Frequently Asked Questions

How Long Can I Leave Water In My Hydro Flask?

Your hydro flask will be able to keep your water cold for a full 24 hours in the right conditions. If you are worried about old water, try to refill it with fresh water regularly.

What Happens If You Do Not Clean Your Hydro Flask?

If you do not wash your hydro flask regularly enough, mold will start to build up and this can be very dangerous for the person drinking from it.

Are Hydro Flasks Dishwasher Safe?

Yes, hydro flasks are powder coated meaning that you can wash them in the dishwasher, this is a great option if you do not want to hand clean them.


Hopefully this guide has helped with any questions you have about cleaning your hydro flask. While this may not seem like the most important thing to need to know, it can drastically improve your health if you keep your water bottle clean.

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