N.J. Stat. § 44:1-31

The superintendent of welfare shall, in addition to his duties as chief executive officer of the welfare-house and welfare board, have general jurisdiction throughout the county, or portion of the county which maintains a welfare-house as in this chapter provided, and the authority and power of an overseer with the consent and approval of the governing body in all municipalities which have no duly constituted overseer performing those duties by contract or otherwise; but the welfare board may designate some officer other than the superintendent of welfare to exercise the power of an overseer, and he shall, in such work as overseer in a municipality, be subject to all lawful rules and regulations of the welfare board. The expense of the work of overseer by the superintendent shall be a charge upon the municipalities of the county so participating, to be levied, assessed and collected therefrom by the board of chosen freeholders in the manner in which other county expenses are collected.