Whenever, in the opinion of the board of county commissioners, the county accountant's letter of credit, bond or any surety thereon becomes insufficient, the board shall require an additional bond or letter of credit. An additional bond or letter of credit shall also be required when a surety to a bond dies or ceases to be a resident of the county. The county accountant or any of the deputies of the accountant, who are required by law to give bonds or letters of credit, may present as surety any lawfully authorized surety company, to be approved by the county commissioners, and the commissioners may pay the premium thereon.
ORS 210.130