Each lot, parcel of land or premises having a private water supply shall be appraised and assessed by the board of appraisers for the purpose of establishing the monthly service charge or fee to be charged or assessed to and against such property. In making such appraisement and assessment, there shall be taken into consideration the volume of effluent, BOD content, suspended solids content and type of waste so as to as nearly as possible fix the rate, charge or fee upon the same relative basis as is herein imposed upon like property under section 7-3-13 of this chapter. (Ord. 928, 11-22-1982)