The department may represent the state in any action to establish paternity or to establish or enforce a support or maintenance obligation. The department may delegate its authority to represent the state in any action to establish paternity or to establish or enforce a support or maintenance obligation under this section to an attorney responsible for support enforcement under s. 59.53 (6) (a) pursuant to a contract entered into under s. 59.53 (5). The department shall ensure that any such contract is for an amount reasonable and necessary to assure quality service. The department may, by such a contract, authorize a county to contract with any attorney, collection agency or other person to collect unpaid child support or maintenance. If a county fails to fully implement the programs under s. 59.53 (5), the department may implement them and may contract with any appropriate person to obtain necessary services. The department shall establish a formula for disbursing funds appropriated under s. 20.437 (2) (md) to carry out a contract under this subsection.