Wastewater usage determination typically involves measuring the volume of water entering a property. This is often accomplished through water meter readings, which track the total amount of water supplied. Because most water used indoors eventually enters the sanitary sewer system, this provides a reasonable proxy for sewer usage. Alternative methods include direct monitoring of sewer lines, although this is less common due to cost and complexity. For example, a property with a water meter reading showing 10,000 gallons of water used in a month might be billed for that same amount of wastewater.
Accurate wastewater measurement is essential for several reasons. It forms the basis of fair and equitable billing for sewer services, ensuring that users pay for their proportionate share. Furthermore, it provides crucial data for infrastructure planning and management. Understanding wastewater flows allows municipalities to anticipate future capacity needs, prioritize upgrades, and prevent system overloads. Historically, wastewater billing was often a flat fee, but the increasing focus on resource management and cost recovery has led to widespread adoption of consumption-based billing.