Why Does My Keurig Taste Like Plastic. As explained earlier, the first main reason is the outgassing issue. The best way to tell if it has gone bad is to use your nose.if coffee has gone bad, the pleasant aroma will be gone and with it much of the taste.using this coffee will not harm you, but will just not have much flavor if the smell is gone.
Introduce your pipe in the boiling water with salt. 2 run some hot water through it. They've all tasted like plastic.