Ohio Rev. Code § 6115.29
At the time of making its order organizing a sanitary district or at any suitable time thereafter, the court shall appoint three appraisers to constitute the board of appraisers of the sanitary district, who shall in every case where appraisers are appointed under sections 6115.01 to 6115.79 of the Revised Code, be recommended by the board of directors of the sanitary district. The board of appraisers shall appraise the lands or other property within and without the district to be acquired for rights of way, reservoirs, and other works of the district, and shall appraise all benefits and damages accruing to all lands within or without the district by reason of the execution of the official plan. The appraisers shall be freeholders residing within the state, who may or may not own lands within the district. No two of the appraisers shall be residents of the same county, except that in the case of a district organized wholly for the reduction of populations of biting arthropods, all the appraisers may be residents of the same county. Each of the appraisers shall, before taking up his duties, take and subscribe to an oath that he will faithfully and impartially discharge his duties as an appraiser, and that he will make a true report of the work done by him. The appraisers shall at their first meeting elect one of their own number chairman, and the secretary of the sanitary district or his deputy shall be ex officio secretary of the board of appraisers during its continuance in office. A majority of the board of appraisers constitutes a quorum, and a concurrence of the majority in any matter within the board's duties shall be sufficient for its determination. The appraisers shall continue to hold their offices until excused by the court, and the court shall fill all vacancies in the board of appraisers, or may appoint a new board of appraisers for subsequent appraisals, as occasion requires. A new board of appraisers, if appointed, shall fill all the requirements of the board of appraisers and perform its duties.
R.C. § 6115.29