Master and Journeyman plumbers are required to successfully complete four credit hours of continuing edcuation within a two-year period.  All Apprentice plumbers are strongly encouraged to complete continuing education as well.  The North Dakota State Plumbing Board Continuing Education Session fee for Master Plumbers and Journeyman Plumbers is $30.00, which must be paid prior the session.  The fee for the North Dakota State Plumbing Board Corrpespondence Course is also $30.00.  Apprentice Plumbers are not required to pay the fee.