Okla. Stat. tit. 19 § 1256
Upon acceptance by the board of county commissioners of said improvements, and before the final payment of the contract price, the board of county commissioners of any county shall require the contractor performing such work to make and execute a good and sufficient surety bond or deposit sufficient securities or obligations of the United States of America or of the State of Oklahoma or some municipality subdivision thereof to be approved by said board of county commissioners in the sum to be determined by the board of county commissioners, in no case to be less than ten percent (10%) of the contract price, conditioned that the contractor will immediately reimburse the county for the maintenance of said improvements against any failure due to defective workmanship or materials for a period of five (5) years from the time of its completion and acceptances. Whenever any repairs of said improvements due to defective workmanship or materials are deemed necessary by the board of county commissioners they shall order the same to be made under the supervision of the county engineer or, where there is no county engineer, contract for the services of a qualified engineer and the costs thereof certified to by said engineer; and, when approved by the board of county commissioners, the contractor and his bondsmen shall be notified of the amount expended and shall immediately become liable therefor.
Okla. Stat. tit. 19, § 1256