Your water meter measures your monthly water use, but there is no meter on your wastewater line. During the winter months, residential customers use the least amount of water with almost all water usage going directly into the sanitary sewer system, so the metered water usage is a good indicator of wastewater. In the summer months, there is significantly more water usage that does not go into the sanitary sewer system, such as water used watering lawns, filling swimming pools, and washing cars. Each year we calculate a typical month’s wastewater usage by averaging the winter months and we use that usage as your wastewater volume for billing throughout the remainder of the year. Typically, this results in substantial savings for residents during the summer months.