The Health Officer shall refuse to issue a permit: Where a public sewer abuts the property in question, unless the public sewer is not legally and/or economically available to the building to be served; Where the installation of such a system would be contrary to any County Water and Sewerage Plan adopted pursuant to Sections 9-503 through 9-515, Environment Article, Annotated Code of Maryland; Where issuance of such permit is in conflict with this or other applicable laws, ordinances, or regulations.