(b) In addition to the monthly meter charge set forth in subsection (a) above, the following shall apply to water used in excess of three thousand (3,000) gallons per month:

Monthly Sewer Rates Inside Corporate Limits

(1) The following monthly service charges include the first three thousand (3,000) gallons and shall be charged to all users based on the water meter size as follows:

(2) For usage in excess of three thousand (3,000) gallons, a monthly service charge shall also be charged to all Residential users in the amount of two dollars and sixty-one cents ($2.61) per one thousand (1,000) gallons of water used over the initial allotment of 3,000 gallons. The service charge for all Commercial and Industrial users shall be two dollars and eighty-three cents ($2.83) per one thousand (1,000) gallons over the initial allotment, unless the Wastewater is metered in which case the service charge shall be three dollars and thirteen cents ($3.13) per thousand over the initial allotment as more specifically set forth hereinafter.