N.D. Cent. Code § 54-52-06.3
Each peace officer, firefighter, or correctional officer employed by a political subdivision that enters an agreement with the retirement board on behalf of its peace officers, firefighters, and correctional officers separately from its other employees and who is a member of the public employees retirement system is assessed and shall pay monthly four percent of the employee's monthly salary. Peace officer, firefighter, or correctional officer contributions increase by one-half of one percent of the member's monthly salary beginning with the monthly reporting period of January 2012, and with an additional increase of one-half of one percent, beginning with the monthly reporting period of January 2013, and with an additional increase of one-half of one percent, beginning with the monthly reporting period of January 2014. The assessment must be deducted and retained out of the employee's salary in equal monthly installments. The peace officer's, firefighter's, or correctional officer's employer shall contribute an amount determined by the board to be actuarially required to support the level of benefits specified in section 54-52-17. If the peace officer's, firefighter's, or correctional officer's assessment is paid by the employer under subsection 3 of section 54-52-05, the employer shall contribute, in addition, an amount equal to the required peace officer's, firefighter's, or correctional officer's assessment.
N.D.C.C. § 54-52-06.3