N.D. Cent. Code § 61-16-07
When a water resource district has been created, and the state water commission has filed notice with the county auditor of a county where the district or a part thereof is situated, a water resource board shall be appointed within ninety days, as provided herein. If the district's boundaries are confined to one county, the board of county commissioners shall appoint a water resource board consisting of three or five managers. When a district includes two counties, the water resource board shall consist of five managers, three appointed by the board of county commissioners of the county having the larger aggregate taxable valuation of property, and two appointed by the board of county commissioners of the other county. If a district includes three counties, the water resource board shall consist of five managers, one appointed by the board of county commissioners having the lowest aggregate taxable valuation of property in the district, and two appointed by the board of county commissioners of each of the other two counties. If a district includes four or six counties, the water resource board shall consist of two members from the county having the largest aggregate taxable valuation of property in the district, and one manager from each of the other counties. If a district includes five or seven counties, the water resource board shall consist of one manager from each county. Appointments to the water resource board shall be made by the boards of county commissioners of the respective counties.
N.D.C.C. § 61-16-07