Iowa Code § 622B.7: Fee.

A sign language interpreter appointed under this chapter is entitled to a reasonable fee and expenses as determined by the rules applying to that proceeding. This schedule shall be furnished to all courts and administrative agencies and maintained by them. If the sign language interpreter is appointed by the court, the fee and expenses shall be paid by the county and if the sign language interpreter is appointed by an administrative agency, the fee and expenses shall be paid out of funds available to the administrative agency.