MAST Permit two bartenders mixing drinks behind the bar.

What is a MAST Permit?

The MAST permit, or Mandatory Alcohol Server Permit, is a required document for anyone who serves, mixes, sells, or supervises the sale of alcohol for on-premises consumption at any establishment licensed to sell liquor in the State of Washington. There are two different types of permits, a Class 12 permit, and a Class 13 permit. A Class 13 permit is for anyone 18 to 20 years of age and a Class 12 MAST permit is for anyone 21 years of age and older.