The Sewer Key is an important item in Stardew Valley. It’s required to gain access to the Sewers, which are home to some of the game’s most valuable treasures. Getting the Sewer Key can be a bit tricky, but it’s definitely worth the effort.
To get the Sewer Key, you’ll first need to donate 60 items to the museum. This can be any item, but it’s easiest to donate items that you find while foraging or fishing. For example, you can donate things like blackberries, salmonberries, and catfish to the museum, which are plentiful in the world of Stardew Valley.
