Ohio Rev. Code § 315.03
Except as provided in section 3.061 of the Revised Code, the county engineer, before entering upon the duties of the office of county engineer, shall give bond, signed by a bonding or surety company authorized to do business in this state, or, at the engineer's option, signed by two or more freeholders having real estate in the value of double the amount of the bond, over and above all encumbrances to the state, in the sum of not less than two thousand nor more than ten thousand dollars as fixed by the board of county commissioners. Such surety company shall be approved by the board and the bond shall be conditioned for the faithful performance of such engineer's official duties.
The expense or premium for such bond shall be paid by the board and charged to the general fund of the county. Such bond, with the oath of office required by sections 3.22 and 3.23 of the Revised Code and Section 7 of Article XV, Ohio Constitution, and the approval of the board indorsed thereon, shall be deposited with the county treasurer and kept in the treasurer's office.
R.C. § 315.03