The water filter in a Keurig coffee maker is located in the bottom of the handle assembly. The water filter is not part of a standard Keurig coffee maker and comes as an optional accessory that is compatible with most models.
To install a water filter on a Keurig coffee maker, first soak the filter in water for up to five minutes. Remove the cover of the water reservoir located on the left side of the machine and insert the filter into the empty reservoir. Push down firmly to ensure the water filter is correctly attached inside the water reservoir.