N.J. Stat. § 40:63-86: Officers; oaths and bonds

The chairman, secretary and treasurer of the joint meeting, and such other officers or servants thereof as may be required by such meeting, before entering upon the discharge of their duties, shall each take and subscribe an oath that he will faithfully and impartially discharge the duties of his office to the best of his skill and understanding. The joint meeting may require the treasurer and any other of its officers or servants to enter into bond to the municipalities jointly contracting, in such sum or sums as may be fixed by it with proper surety satisfactory to and fixed by the joint meeting.