(a) Water main - a pipe carrying water which is generally available to more than one service line.

(b) Extension - the extension of water main including the pipe, elbows, tees, valves, reducers, service taps, and other appurtenances which may be part of the facilities extended to provide water service.

(c) Service line or lateral - the pipe and valves which are used to deliver the water from the main into the customer premises; the company portion being that between the main and the customer property line, and the customer portion being that from the property line into the premises.

(d) Service connection - the facilities necessary to provide the customer service, including the service line, the main tap, meter, and other related facilities.

(e) Extension costs - as used in this Part shall include the costs of labor, equipment and materials used in the extension installation, all paving charges for the repair or replacement of street or sidewalk which may be disturbed in the course of such installation, the costs of inspection, amounts paid to governmental authorities for permits to do the work required, and other costs or taxes that are legally imposed by any governmental authority.

(f) Applicant - a person, developer, builder, partnership, association, corporation, or governmental agency requesting service to a specific location.

(g) Developer - a business or person who will subdivide or prepare real estate for residential or commercial occupancy, who requires the installation of utility plant in advance of occupancy, and whose success resulting in utility customers can be considered speculative since it is dependent upon the success of the real estate venture.

(h) Residential service - water service for sanitary and potable domestic use.

(i) Surcharge - a charge billed to the customer in addition to the regular bill for service.

(j) Gross annual utility revenue - the total of customer charges for utility service billed in one year.

(k) Advance or deposit - money advanced by the applicant to the utility subject to refund.

(l) Contribution - money paid by the applicant to the utility, usually to pay for the cost of installing plant, which will not be refunded.

(m) Water-works tariff - the schedule of rules and charges for water service, filed with and approved by the Commission, under which the utility is required to provide service.

(n) Service area - the area in which the utility has required government authorization to provide utility service.