Colorado Revised Statutes Title 30. Government County § 30-1-106. Service must be made upon offer or tender of fees

(1) No sheriff shall refuse to serve any writ, summons, or notice requested by any person entitled to such service, when offered or tendered the fees allowed by law for such service; nor shall he or she charge, demand, or receive any greater sum or compensation or allowance.

(2) A sheriff shall have the authority to establish billing accounts for licensed attorneys and licensed collection agencies that have a principal office located in the state.

(3) A sheriff shall have the authority to develop and publish standardized procedures for billing the accounts authorized by subsection (2) of this section. Such procedures may include the ability to suspend the billing privileges of any entity for nonpayment of a fee upon demand or other good cause shown.