As used in this chapter:
"Board" means the board of water supply of each county;
"Council" means the council of each county;
"County" means a county or city and county of the State;
"County attorney" means the legal advisor of a county;
"County auditor" means the auditor or finance officer of a county performing the audit function;
"County treasurer" means the county official maintaining its treasury;
"Mayor" means the executive officer of a county.