The Treasurer of the District shall be appointed by the Board of Supervisors, shall not be a member of the Board, and shall serve at its pleasure. The Treasurer shall have the exclusive charge and custody of the funds of the District and shall be the disbursing officer of the District. When authorized by the Board of Supervisors, the Treasurer may sign, make, or endorse in the name of the District all checks and orders for the payment of money and pay out and disburse the same and receipt therefor. The Treasurer shall keep a record of every note or bond issued by the District and of every payment thereon of principal and interest and, if coupons are taken up, shall cancel and preserve them. The Treasurer shall keep correct books of account of all the business and transactions of the District and such other books and accounts as the Board of Supervisors may require. The Treasurer shall render a statement of the condition of the finances of the District at each regular meeting of the Board of Supervisors and at such other times as shall be required of the Treasurer. The Treasurer shall prepare the annual financial statement and the budget of the District for distribution, upon approval of the Board of Supervisors, to the legislative bodies of the member municipalities. The Treasurer shall do and perform all of the duties appertaining to the office of treasurer of a body politic and corporate. The treasurer shall settle with the auditors within 60 days of the end of the fiscal year, at such other times as the Board of Supervisors may require, and upon retirement from office. Upon retirement from office, the Treasurer shall immediately pay over to his or her successor all of the funds belonging to the District and at the same time deliver to his or her successor all official books and papers.