For the purpose of this chapter, the following terms are hereby defined:
SANITARY SEWAGE: The liquid waste which may or may not contain solids, originating in the sanitary conveniences for personnel of a dwelling, business building, factory or institution.
SANITARY SEWERAGE SYSTEM: Includes all sanitary sewer trunk lines, main lines, submain lines, lateral lines and sewage treatment plants, and all sewer lines connected to the city sewer lines or treatment plants whether owned by the city or not.
USER OF THE SANITARY SEWERAGE SYSTEM: The person, firm or corporation having a contract for water service at a particular location, if the location has a sanitary sewer connection with the city system, or in case there is no water contract on file, then the person, firm or corporation which is charged with water bills for the location, or which pays the same, or in case a private water supply is used, then the proprietor of the location having the sewer connection. (1986 Code § 18-18)