You water bill is based on consumption. The reading is calculated in units and is shown on your bill under the usage block (left hand side of bill). Units are calculated in 100 cubic feet (CCF) and the amount of the units used fluctuates as a result of a number of things. Many customers increase their water consumption in the summer months by watering gardens, washing cars, filling swimming pools, etc. Bills may also fluctuate based on the number of days in a billing period. Quarterly bills can on occasion be over or under 90 days depending upon the day your meter was read.