Calculate how many cubic feet or HCFs on average you use.
In the first tier calculate the first units up to four and multiply the dollar amount by number of units, then if you fall into the next tier - Tier 2, multiply the number of units by the Tier 2 dollar amount, followed by Tier 3 if applicable. Then add all totals together with the your monthly fixed charge.
EXAMPLE: New Rates Residential home that uses 6 units of water; Tier 1: 4 units x $3.65 = $14.60; Tier 2: 4 units x $6.17 = $24.68; 5/8 inch fix charge = $20.75 ; Charges = $60.03.
For Mobile Home and Multi-Residential Rates calculate similar to the Residential Home but include a multiplier of the number of dwelling units that make up the property.
EXAMPLE: 2 Dwelling Units ; Tier 1: (4 units x $3.65) x 2 Dwelling Units = $29.20, etc.