N.J. Stat. Ann. § 43:15A-30

In accordance with the rate of contribution and the extra salary deductions certified by the retirement system, each department and each branch of State service not within a department shall certify to the State Treasurer the contribution and extra deductions to be made for the retirement system. The State Treasurer shall pay each of the amounts so deducted to the retirement system, and he shall transfer to the retirement system monthly or at such interval as the system designates a detailed statement of all amounts so paid. The retirement system shall cause each of the amounts so deducted to be credited to the individual account of the member from whose compensation the deduction was made.