The owner of any lot, parcel of real estate, or building connecting to the sewage works shall, prior to being permitted to make a connection, pay a connection charge in the amount of $500 for the first dwelling unit upon that real estate, and an additional connection charge in the amount of $250 for each additional dwelling unit upon that parcel of real estate, which charge the Board of Trustees now finds to be a reasonable and equitable pro rata cost of construction of a local or lateral sewer adequate to serve the property so connecting.
(‘82 Code, § 32-202)