N.D. Cent. Code § 4.1-27-10

Each livestock auction market must be maintained in a sanitary condition in accordance with this chapter. Any portion of a livestock auction market used for the handling of hogs, including all hogpens, alleys, and auction markets, must be equipped with concrete floors at least three inches [7.62 centimeters] thick. The concrete floors must be cleaned and disinfected after each sale, or in case of a continuous sale, not less than once each week or as may be prescribed by the state board of animal health.